Restore development version

Stockfish bench signature is: 5423738

Readme.txt

@@ -2,19 +2,21 @@
 ---------------
 
 Stockfish is a free UCI chess engine derived from Glaurung 2.1. It is
-not a complete chess program, but requires some UCI compatible GUI
+not a complete chess program and requires some UCI-compatible GUI
-(like XBoard with PolyGlot, eboard, Jos�, Arena, Sigma Chess, Shredder,
+(e.g. XBoard with PolyGlot, eboard, Arena, Sigma Chess, Shredder, Chess
-Chess Partner, or Fritz) in order to be used comfortably.  Read the
+Partner or Fritz) in order to be used comfortably. Read the
 documentation for your GUI of choice for information about how to use
-Stockfish with your GUI.
+Stockfish with it.
 
-This version of Stockfish supports up to 8 CPUs, but has not been
+This version of Stockfish supports up to 32 CPUs, but has not been
-tested thoroughly with more than 2.  The program tries to detect the
+tested thoroughly with more than 4.  The program tries to detect the
-number of CPUs on your computer and set the number of search threads
+number of CPUs on your computer and sets the number of search threads
 accordingly, but please be aware that the detection is not always
 correct. It is therefore recommended to inspect the value of the
 "Threads" UCI parameter, and to make sure it equals the number of CPU
-cores on your computer.
+cores on your computer. If you are using more than eight threads, it is
+recommended to raise the value of the "Min Split Depth" UCI parameter to
+7.
 
 
 2. Files
@@ -24,13 +26,12 @@ This distribution of Stockfish consists of the following files:
 
   * Readme.txt, the file you are currently reading.
 
-  * Copying.txt, a text file containing the GNU General Public
+  * Copying.txt, a text file containing the GNU General Public License.
-    License.
 
   * src/, a subdirectory containing the full source code, including a
-    Makefile that can be used to compile Stockfish on Unix-like
+    Makefile that can be used to compile Stockfish on Unix-like systems.
-    systems.  For further information about how to compile Stockfish
+    For further information about how to compile Stockfish yourself read
-    yourself, read section 4 below.
+    section 4 below.
 
   * polyglot.ini, for using Stockfish with Fabien Letouzey's PolyGlot
     adapter.
@@ -39,42 +40,29 @@ This distribution of Stockfish consists of the following files:
 3. Opening books
 ----------------
 
-This version of Stockfish has experimental support for PolyGlot opening
+This version of Stockfish has support for PolyGlot opening books. For
-books. For information about how to create such books, consult the
+information about how to create such books, consult the PolyGlot
-PolyGlot documentation.  The book file can be selected by setting the
+documentation. The book file can be selected by setting the "Book File"
-UCI parameter "Book File".
+UCI parameter.
-
 
 
 4. Compiling it yourself
 ------------------------
 
-On Unix-like systems, it should usually be possible to compile
+On Unix-like systems, it should be possible to compile Stockfish
-Stockfish directly from the source code with the included Makefile.
+directly from the source code with the included Makefile.
-The exception is computer with big-endian CPUs, like PowerPC
-Macintoshes. Some of the bitboard routines in the current version of
-Stockfish are endianness-sensitive, and won't work on a big-endian CPU.
-Ensuring that the line with #define USE_32BIT_ATTACKS" near the top
-of bitboard.h is commented out should solve this problem.
-Commenting out the line with "#define USE_32BIT_ATTACKS" near the
 
-There is also a problem with compiling Stockfish on certain 64-bit
+Stockfish has support for 32 or 64-bit CPUs, the hardware POPCNT
-systems, regardless of the endianness.  If Stockfish segfaults
+instruction, big-endian machines such as Power PC, and other platforms.
-immediately after startup, try to comment out the line with
-"#define USE_FOLDED_BITSCAN" near the beginning of bitboard.h and
-recompile.
 
-Finally, even if Stockfish does work without any changes on your
+In general it is recommended to run 'make help' to see a list of make
-computer, it might be possible to improve the performance by changing
+targets with corresponding descriptions. When not using Makefile to
-some of the #define directives in bitboard.h.  The default settings
+compile (for instance with Microsoft MSVC) you need to manually
-are optimized for 64-bit CPUs.  On 32-bit CPUs, it is probably better
+set/unset some switches in the compiler command line; see file "types.h"
-to switch on USE_32BIT_ATTACKS, and to use BITCOUNT_SWAR_32 instead of
+for a quick reference.
-BITCOUNT_SWAR_64.  For computers with very little memory (like
-handheld devices), it is possible to conserve memory by defining
-USE_COMPACT_ROOK_ATTACKS.
 
 
-6. Terms of use
+5. Terms of use
 ---------------
 
 Stockfish is free, and distributed under the GNU General Public License
@@ -91,9 +79,3 @@ source code, these changes must also be made available under the GPL.
 
 For full details, read the copy of the GPL found in the file named
 Copying.txt.
-
-
-7. Feedback
------------
-
-The author's e-mail address is mcostalba@gmail.com

polyglot.ini

@@ -2,69 +2,42 @@
 [PolyGlot]
 
 EngineDir = .
-EngineCommand = ./glaurung
+EngineCommand = ./stockfish
 
 Book = false
 BookFile = book.bin
 
-Log = true
+Log = false
-LogFile = glaurung.log
+LogFile = stockfish.log
 
 Resign = true
 ResignScore = 600
 
 [Engine]
 
-Hash = 128
-Threads = 1
-OwnBook = false
-Book File = book.bin
 Use Search Log = false
+Search Log Filename = SearchLog.txt
+Book File = book.bin
+Best Book Move = false
 Mobility (Middle Game) = 100
 Mobility (Endgame) = 100
-Pawn Structure (Middle Game) = 100
-Pawn Structure (Endgame) = 100
 Passed Pawns (Middle Game) = 100
 Passed Pawns (Endgame) = 100
+Space = 100
 Aggressiveness = 100
 Cowardice = 100
-King Safety Curve = Quadratic
+Min Split Depth = 4
-Quadratic = Linear
+Max Threads per Split Point = 5
-King Safety Coefficient = 40
+Threads = 1
-King Safety X Intercept = 0
+Use Sleeping Threads = true
-King Safety Max Slope = 30
+Hash = 128
-King Safety Max Value = 500
+Ponder = true
-Queen Contact Check Bonus = 4
+OwnBook = false
-Rook Contact Check Bonus = 2
+MultiPV = 1
-Queen Check Bonus = 2
+Skill Level = 20
-Rook Check Bonus = 1
+Emergency Move Horizon = 40
-Bishop Check Bonus = 1
+Emergency Base Time = 200
-Knight Check Bonus = 1
+Emergency Move Time = 70
-Discovered Check Bonus = 3
+Minimum Thinking Time = 20
-Mate Threat Bonus = 3
+UCI_Chess960 = false
-Check Extension (PV nodes) = 2
+UCI_AnalyseMode = false
-Check Extension (non-PV nodes) = 1
-Single Reply Extension (PV nodes) = 2
-Single Reply Extension (non-PV nodes) = 2
-Mate Threat Extension (PV nodes) = 0
-Mate Threat Extension (non-PV nodes) = 0
-Pawn Push to 7th Extension (PV nodes) = 1
-Pawn Push to 7th Extension (non-PV nodes) = 1
-Passed Pawn Extension (PV nodes) = 1
-Passed Pawn Extension (non-PV nodes) = 0
-Pawn Endgame Extension (PV nodes) = 2
-Pawn Endgame Extension (non-PV nodes) = 2
-Full Depth Moves (PV nodes) = 14
-Full Depth Moves (non-PV nodes) = 3
-Threat Depth = 5
-Selective Plies = 7
-Futility Pruning (Main Search) = true
-Futility Pruning (Quiescence Search) = true
-Futility Margin 0 = 50
-Futility Margin 1 = 100
-Futility Margin 2 = 300
-Maximum Razoring Depth = 3
-Razoring Margin = 300
-Randomness = 0
-Minimum Split Depth = 4
-Maximum Number of Threads per Split Point = 5

src/COPYING

@@ -1,674 +0,0 @@
-                    GNU GENERAL PUBLIC LICENSE
-                       Version 3, 29 June 2007
-
- Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
-
-                            Preamble
-
-  The GNU General Public License is a free, copyleft license for
-software and other kinds of works.
-
-  The licenses for most software and other practical works are designed
-to take away your freedom to share and change the works.  By contrast,
-the GNU General Public License is intended to guarantee your freedom to
-share and change all versions of a program--to make sure it remains free
-software for all its users.  We, the Free Software Foundation, use the
-GNU General Public License for most of our software; it applies also to
-any other work released this way by its authors.  You can apply it to
-your programs, too.
-
-  When we speak of free software, we are referring to freedom, not
-price.  Our General Public Licenses are designed to make sure that you
-have the freedom to distribute copies of free software (and charge for
-them if you wish), that you receive source code or can get it if you
-want it, that you can change the software or use pieces of it in new
-free programs, and that you know you can do these things.
-
-  To protect your rights, we need to prevent others from denying you
-these rights or asking you to surrender the rights.  Therefore, you have
-certain responsibilities if you distribute copies of the software, or if
-you modify it: responsibilities to respect the freedom of others.
-
-  For example, if you distribute copies of such a program, whether
-gratis or for a fee, you must pass on to the recipients the same
-freedoms that you received.  You must make sure that they, too, receive
-or can get the source code.  And you must show them these terms so they
-know their rights.
-
-  Developers that use the GNU GPL protect your rights with two steps:
-(1) assert copyright on the software, and (2) offer you this License
-giving you legal permission to copy, distribute and/or modify it.
-
-  For the developers' and authors' protection, the GPL clearly explains
-that there is no warranty for this free software.  For both users' and
-authors' sake, the GPL requires that modified versions be marked as
-changed, so that their problems will not be attributed erroneously to
-authors of previous versions.
-
-  Some devices are designed to deny users access to install or run
-modified versions of the software inside them, although the manufacturer
-can do so.  This is fundamentally incompatible with the aim of
-protecting users' freedom to change the software.  The systematic
-pattern of such abuse occurs in the area of products for individuals to
-use, which is precisely where it is most unacceptable.  Therefore, we
-have designed this version of the GPL to prohibit the practice for those
-products.  If such problems arise substantially in other domains, we
-stand ready to extend this provision to those domains in future versions
-of the GPL, as needed to protect the freedom of users.
-
-  Finally, every program is threatened constantly by software patents.
-States should not allow patents to restrict development and use of
-software on general-purpose computers, but in those that do, we wish to
-avoid the special danger that patents applied to a free program could
-make it effectively proprietary.  To prevent this, the GPL assures that
-patents cannot be used to render the program non-free.
-
-  The precise terms and conditions for copying, distribution and
-modification follow.
-
-                       TERMS AND CONDITIONS
-
-  0. Definitions.
-
-  "This License" refers to version 3 of the GNU General Public License.
-
-  "Copyright" also means copyright-like laws that apply to other kinds of
-works, such as semiconductor masks.
-
-  "The Program" refers to any copyrightable work licensed under this
-License.  Each licensee is addressed as "you".  "Licensees" and
-"recipients" may be individuals or organizations.
-
-  To "modify" a work means to copy from or adapt all or part of the work
-in a fashion requiring copyright permission, other than the making of an
-exact copy.  The resulting work is called a "modified version" of the
-earlier work or a work "based on" the earlier work.
-
-  A "covered work" means either the unmodified Program or a work based
-on the Program.
-
-  To "propagate" a work means to do anything with it that, without
-permission, would make you directly or secondarily liable for
-infringement under applicable copyright law, except executing it on a
-computer or modifying a private copy.  Propagation includes copying,
-distribution (with or without modification), making available to the
-public, and in some countries other activities as well.
-
-  To "convey" a work means any kind of propagation that enables other
-parties to make or receive copies.  Mere interaction with a user through
-a computer network, with no transfer of a copy, is not conveying.
-
-  An interactive user interface displays "Appropriate Legal Notices"
-to the extent that it includes a convenient and prominently visible
-feature that (1) displays an appropriate copyright notice, and (2)
-tells the user that there is no warranty for the work (except to the
-extent that warranties are provided), that licensees may convey the
-work under this License, and how to view a copy of this License.  If
-the interface presents a list of user commands or options, such as a
-menu, a prominent item in the list meets this criterion.
-
-  1. Source Code.
-
-  The "source code" for a work means the preferred form of the work
-for making modifications to it.  "Object code" means any non-source
-form of a work.
-
-  A "Standard Interface" means an interface that either is an official
-standard defined by a recognized standards body, or, in the case of
-interfaces specified for a particular programming language, one that
-is widely used among developers working in that language.
-
-  The "System Libraries" of an executable work include anything, other
-than the work as a whole, that (a) is included in the normal form of
-packaging a Major Component, but which is not part of that Major
-Component, and (b) serves only to enable use of the work with that
-Major Component, or to implement a Standard Interface for which an
-implementation is available to the public in source code form.  A
-"Major Component", in this context, means a major essential component
-(kernel, window system, and so on) of the specific operating system
-(if any) on which the executable work runs, or a compiler used to
-produce the work, or an object code interpreter used to run it.
-
-  The "Corresponding Source" for a work in object code form means all
-the source code needed to generate, install, and (for an executable
-work) run the object code and to modify the work, including scripts to
-control those activities.  However, it does not include the work's
-System Libraries, or general-purpose tools or generally available free
-programs which are used unmodified in performing those activities but
-which are not part of the work.  For example, Corresponding Source
-includes interface definition files associated with source files for
-the work, and the source code for shared libraries and dynamically
-linked subprograms that the work is specifically designed to require,
-such as by intimate data communication or control flow between those
-subprograms and other parts of the work.
-
-  The Corresponding Source need not include anything that users
-can regenerate automatically from other parts of the Corresponding
-Source.
-
-  The Corresponding Source for a work in source code form is that
-same work.
-
-  2. Basic Permissions.
-
-  All rights granted under this License are granted for the term of
-copyright on the Program, and are irrevocable provided the stated
-conditions are met.  This License explicitly affirms your unlimited
-permission to run the unmodified Program.  The output from running a
-covered work is covered by this License only if the output, given its
-content, constitutes a covered work.  This License acknowledges your
-rights of fair use or other equivalent, as provided by copyright law.
-
-  You may make, run and propagate covered works that you do not
-convey, without conditions so long as your license otherwise remains
-in force.  You may convey covered works to others for the sole purpose
-of having them make modifications exclusively for you, or provide you
-with facilities for running those works, provided that you comply with
-the terms of this License in conveying all material for which you do
-not control copyright.  Those thus making or running the covered works
-for you must do so exclusively on your behalf, under your direction
-and control, on terms that prohibit them from making any copies of
-your copyrighted material outside their relationship with you.
-
-  Conveying under any other circumstances is permitted solely under
-the conditions stated below.  Sublicensing is not allowed; section 10
-makes it unnecessary.
-
-  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
-
-  No covered work shall be deemed part of an effective technological
-measure under any applicable law fulfilling obligations under article
-11 of the WIPO copyright treaty adopted on 20 December 1996, or
-similar laws prohibiting or restricting circumvention of such
-measures.
-
-  When you convey a covered work, you waive any legal power to forbid
-circumvention of technological measures to the extent such circumvention
-is effected by exercising rights under this License with respect to
-the covered work, and you disclaim any intention to limit operation or
-modification of the work as a means of enforcing, against the work's
-users, your or third parties' legal rights to forbid circumvention of
-technological measures.
-
-  4. Conveying Verbatim Copies.
-
-  You may convey verbatim copies of the Program's source code as you
-receive it, in any medium, provided that you conspicuously and
-appropriately publish on each copy an appropriate copyright notice;
-keep intact all notices stating that this License and any
-non-permissive terms added in accord with section 7 apply to the code;
-keep intact all notices of the absence of any warranty; and give all
-recipients a copy of this License along with the Program.
-
-  You may charge any price or no price for each copy that you convey,
-and you may offer support or warranty protection for a fee.
-
-  5. Conveying Modified Source Versions.
-
-  You may convey a work based on the Program, or the modifications to
-produce it from the Program, in the form of source code under the
-terms of section 4, provided that you also meet all of these conditions:
-
-    a) The work must carry prominent notices stating that you modified
-    it, and giving a relevant date.
-
-    b) The work must carry prominent notices stating that it is
-    released under this License and any conditions added under section
-    7.  This requirement modifies the requirement in section 4 to
-    "keep intact all notices".
-
-    c) You must license the entire work, as a whole, under this
-    License to anyone who comes into possession of a copy.  This
-    License will therefore apply, along with any applicable section 7
-    additional terms, to the whole of the work, and all its parts,
-    regardless of how they are packaged.  This License gives no
-    permission to license the work in any other way, but it does not
-    invalidate such permission if you have separately received it.
-
-    d) If the work has interactive user interfaces, each must display
-    Appropriate Legal Notices; however, if the Program has interactive
-    interfaces that do not display Appropriate Legal Notices, your
-    work need not make them do so.
-
-  A compilation of a covered work with other separate and independent
-works, which are not by their nature extensions of the covered work,
-and which are not combined with it such as to form a larger program,
-in or on a volume of a storage or distribution medium, is called an
-"aggregate" if the compilation and its resulting copyright are not
-used to limit the access or legal rights of the compilation's users
-beyond what the individual works permit.  Inclusion of a covered work
-in an aggregate does not cause this License to apply to the other
-parts of the aggregate.
-
-  6. Conveying Non-Source Forms.
-
-  You may convey a covered work in object code form under the terms
-of sections 4 and 5, provided that you also convey the
-machine-readable Corresponding Source under the terms of this License,
-in one of these ways:
-
-    a) Convey the object code in, or embodied in, a physical product
-    (including a physical distribution medium), accompanied by the
-    Corresponding Source fixed on a durable physical medium
-    customarily used for software interchange.
-
-    b) Convey the object code in, or embodied in, a physical product
-    (including a physical distribution medium), accompanied by a
-    written offer, valid for at least three years and valid for as
-    long as you offer spare parts or customer support for that product
-    model, to give anyone who possesses the object code either (1) a
-    copy of the Corresponding Source for all the software in the
-    product that is covered by this License, on a durable physical
-    medium customarily used for software interchange, for a price no
-    more than your reasonable cost of physically performing this
-    conveying of source, or (2) access to copy the
-    Corresponding Source from a network server at no charge.
-
-    c) Convey individual copies of the object code with a copy of the
-    written offer to provide the Corresponding Source.  This
-    alternative is allowed only occasionally and noncommercially, and
-    only if you received the object code with such an offer, in accord
-    with subsection 6b.
-
-    d) Convey the object code by offering access from a designated
-    place (gratis or for a charge), and offer equivalent access to the
-    Corresponding Source in the same way through the same place at no
-    further charge.  You need not require recipients to copy the
-    Corresponding Source along with the object code.  If the place to
-    copy the object code is a network server, the Corresponding Source
-    may be on a different server (operated by you or a third party)
-    that supports equivalent copying facilities, provided you maintain
-    clear directions next to the object code saying where to find the
-    Corresponding Source.  Regardless of what server hosts the
-    Corresponding Source, you remain obligated to ensure that it is
-    available for as long as needed to satisfy these requirements.
-
-    e) Convey the object code using peer-to-peer transmission, provided
-    you inform other peers where the object code and Corresponding
-    Source of the work are being offered to the general public at no
-    charge under subsection 6d.
-
-  A separable portion of the object code, whose source code is excluded
-from the Corresponding Source as a System Library, need not be
-included in conveying the object code work.
-
-  A "User Product" is either (1) a "consumer product", which means any
-tangible personal property which is normally used for personal, family,
-or household purposes, or (2) anything designed or sold for incorporation
-into a dwelling.  In determining whether a product is a consumer product,
-doubtful cases shall be resolved in favor of coverage.  For a particular
-product received by a particular user, "normally used" refers to a
-typical or common use of that class of product, regardless of the status
-of the particular user or of the way in which the particular user
-actually uses, or expects or is expected to use, the product.  A product
-is a consumer product regardless of whether the product has substantial
-commercial, industrial or non-consumer uses, unless such uses represent
-the only significant mode of use of the product.
-
-  "Installation Information" for a User Product means any methods,
-procedures, authorization keys, or other information required to install
-and execute modified versions of a covered work in that User Product from
-a modified version of its Corresponding Source.  The information must
-suffice to ensure that the continued functioning of the modified object
-code is in no case prevented or interfered with solely because
-modification has been made.
-
-  If you convey an object code work under this section in, or with, or
-specifically for use in, a User Product, and the conveying occurs as
-part of a transaction in which the right of possession and use of the
-User Product is transferred to the recipient in perpetuity or for a
-fixed term (regardless of how the transaction is characterized), the
-Corresponding Source conveyed under this section must be accompanied
-by the Installation Information.  But this requirement does not apply
-if neither you nor any third party retains the ability to install
-modified object code on the User Product (for example, the work has
-been installed in ROM).
-
-  The requirement to provide Installation Information does not include a
-requirement to continue to provide support service, warranty, or updates
-for a work that has been modified or installed by the recipient, or for
-the User Product in which it has been modified or installed.  Access to a
-network may be denied when the modification itself materially and
-adversely affects the operation of the network or violates the rules and
-protocols for communication across the network.
-
-  Corresponding Source conveyed, and Installation Information provided,
-in accord with this section must be in a format that is publicly
-documented (and with an implementation available to the public in
-source code form), and must require no special password or key for
-unpacking, reading or copying.
-
-  7. Additional Terms.
-
-  "Additional permissions" are terms that supplement the terms of this
-License by making exceptions from one or more of its conditions.
-Additional permissions that are applicable to the entire Program shall
-be treated as though they were included in this License, to the extent
-that they are valid under applicable law.  If additional permissions
-apply only to part of the Program, that part may be used separately
-under those permissions, but the entire Program remains governed by
-this License without regard to the additional permissions.
-
-  When you convey a copy of a covered work, you may at your option
-remove any additional permissions from that copy, or from any part of
-it.  (Additional permissions may be written to require their own
-removal in certain cases when you modify the work.)  You may place
-additional permissions on material, added by you to a covered work,
-for which you have or can give appropriate copyright permission.
-
-  Notwithstanding any other provision of this License, for material you
-add to a covered work, you may (if authorized by the copyright holders of
-that material) supplement the terms of this License with terms:
-
-    a) Disclaiming warranty or limiting liability differently from the
-    terms of sections 15 and 16 of this License; or
-
-    b) Requiring preservation of specified reasonable legal notices or
-    author attributions in that material or in the Appropriate Legal
-    Notices displayed by works containing it; or
-
-    c) Prohibiting misrepresentation of the origin of that material, or
-    requiring that modified versions of such material be marked in
-    reasonable ways as different from the original version; or
-
-    d) Limiting the use for publicity purposes of names of licensors or
-    authors of the material; or
-
-    e) Declining to grant rights under trademark law for use of some
-    trade names, trademarks, or service marks; or
-
-    f) Requiring indemnification of licensors and authors of that
-    material by anyone who conveys the material (or modified versions of
-    it) with contractual assumptions of liability to the recipient, for
-    any liability that these contractual assumptions directly impose on
-    those licensors and authors.
-
-  All other non-permissive additional terms are considered "further
-restrictions" within the meaning of section 10.  If the Program as you
-received it, or any part of it, contains a notice stating that it is
-governed by this License along with a term that is a further
-restriction, you may remove that term.  If a license document contains
-a further restriction but permits relicensing or conveying under this
-License, you may add to a covered work material governed by the terms
-of that license document, provided that the further restriction does
-not survive such relicensing or conveying.
-
-  If you add terms to a covered work in accord with this section, you
-must place, in the relevant source files, a statement of the
-additional terms that apply to those files, or a notice indicating
-where to find the applicable terms.
-
-  Additional terms, permissive or non-permissive, may be stated in the
-form of a separately written license, or stated as exceptions;
-the above requirements apply either way.
-
-  8. Termination.
-
-  You may not propagate or modify a covered work except as expressly
-provided under this License.  Any attempt otherwise to propagate or
-modify it is void, and will automatically terminate your rights under
-this License (including any patent licenses granted under the third
-paragraph of section 11).
-
-  However, if you cease all violation of this License, then your
-license from a particular copyright holder is reinstated (a)
-provisionally, unless and until the copyright holder explicitly and
-finally terminates your license, and (b) permanently, if the copyright
-holder fails to notify you of the violation by some reasonable means
-prior to 60 days after the cessation.
-
-  Moreover, your license from a particular copyright holder is
-reinstated permanently if the copyright holder notifies you of the
-violation by some reasonable means, this is the first time you have
-received notice of violation of this License (for any work) from that
-copyright holder, and you cure the violation prior to 30 days after
-your receipt of the notice.
-
-  Termination of your rights under this section does not terminate the
-licenses of parties who have received copies or rights from you under
-this License.  If your rights have been terminated and not permanently
-reinstated, you do not qualify to receive new licenses for the same
-material under section 10.
-
-  9. Acceptance Not Required for Having Copies.
-
-  You are not required to accept this License in order to receive or
-run a copy of the Program.  Ancillary propagation of a covered work
-occurring solely as a consequence of using peer-to-peer transmission
-to receive a copy likewise does not require acceptance.  However,
-nothing other than this License grants you permission to propagate or
-modify any covered work.  These actions infringe copyright if you do
-not accept this License.  Therefore, by modifying or propagating a
-covered work, you indicate your acceptance of this License to do so.
-
-  10. Automatic Licensing of Downstream Recipients.
-
-  Each time you convey a covered work, the recipient automatically
-receives a license from the original licensors, to run, modify and
-propagate that work, subject to this License.  You are not responsible
-for enforcing compliance by third parties with this License.
-
-  An "entity transaction" is a transaction transferring control of an
-organization, or substantially all assets of one, or subdividing an
-organization, or merging organizations.  If propagation of a covered
-work results from an entity transaction, each party to that
-transaction who receives a copy of the work also receives whatever
-licenses to the work the party's predecessor in interest had or could
-give under the previous paragraph, plus a right to possession of the
-Corresponding Source of the work from the predecessor in interest, if
-the predecessor has it or can get it with reasonable efforts.
-
-  You may not impose any further restrictions on the exercise of the
-rights granted or affirmed under this License.  For example, you may
-not impose a license fee, royalty, or other charge for exercise of
-rights granted under this License, and you may not initiate litigation
-(including a cross-claim or counterclaim in a lawsuit) alleging that
-any patent claim is infringed by making, using, selling, offering for
-sale, or importing the Program or any portion of it.
-
-  11. Patents.
-
-  A "contributor" is a copyright holder who authorizes use under this
-License of the Program or a work on which the Program is based.  The
-work thus licensed is called the contributor's "contributor version".
-
-  A contributor's "essential patent claims" are all patent claims
-owned or controlled by the contributor, whether already acquired or
-hereafter acquired, that would be infringed by some manner, permitted
-by this License, of making, using, or selling its contributor version,
-but do not include claims that would be infringed only as a
-consequence of further modification of the contributor version.  For
-purposes of this definition, "control" includes the right to grant
-patent sublicenses in a manner consistent with the requirements of
-this License.
-
-  Each contributor grants you a non-exclusive, worldwide, royalty-free
-patent license under the contributor's essential patent claims, to
-make, use, sell, offer for sale, import and otherwise run, modify and
-propagate the contents of its contributor version.
-
-  In the following three paragraphs, a "patent license" is any express
-agreement or commitment, however denominated, not to enforce a patent
-(such as an express permission to practice a patent or covenant not to
-sue for patent infringement).  To "grant" such a patent license to a
-party means to make such an agreement or commitment not to enforce a
-patent against the party.
-
-  If you convey a covered work, knowingly relying on a patent license,
-and the Corresponding Source of the work is not available for anyone
-to copy, free of charge and under the terms of this License, through a
-publicly available network server or other readily accessible means,
-then you must either (1) cause the Corresponding Source to be so
-available, or (2) arrange to deprive yourself of the benefit of the
-patent license for this particular work, or (3) arrange, in a manner
-consistent with the requirements of this License, to extend the patent
-license to downstream recipients.  "Knowingly relying" means you have
-actual knowledge that, but for the patent license, your conveying the
-covered work in a country, or your recipient's use of the covered work
-in a country, would infringe one or more identifiable patents in that
-country that you have reason to believe are valid.
-
-  If, pursuant to or in connection with a single transaction or
-arrangement, you convey, or propagate by procuring conveyance of, a
-covered work, and grant a patent license to some of the parties
-receiving the covered work authorizing them to use, propagate, modify
-or convey a specific copy of the covered work, then the patent license
-you grant is automatically extended to all recipients of the covered
-work and works based on it.
-
-  A patent license is "discriminatory" if it does not include within
-the scope of its coverage, prohibits the exercise of, or is
-conditioned on the non-exercise of one or more of the rights that are
-specifically granted under this License.  You may not convey a covered
-work if you are a party to an arrangement with a third party that is
-in the business of distributing software, under which you make payment
-to the third party based on the extent of your activity of conveying
-the work, and under which the third party grants, to any of the
-parties who would receive the covered work from you, a discriminatory
-patent license (a) in connection with copies of the covered work
-conveyed by you (or copies made from those copies), or (b) primarily
-for and in connection with specific products or compilations that
-contain the covered work, unless you entered into that arrangement,
-or that patent license was granted, prior to 28 March 2007.
-
-  Nothing in this License shall be construed as excluding or limiting
-any implied license or other defenses to infringement that may
-otherwise be available to you under applicable patent law.
-
-  12. No Surrender of Others' Freedom.
-
-  If conditions are imposed on you (whether by court order, agreement or
-otherwise) that contradict the conditions of this License, they do not
-excuse you from the conditions of this License.  If you cannot convey a
-covered work so as to satisfy simultaneously your obligations under this
-License and any other pertinent obligations, then as a consequence you may
-not convey it at all.  For example, if you agree to terms that obligate you
-to collect a royalty for further conveying from those to whom you convey
-the Program, the only way you could satisfy both those terms and this
-License would be to refrain entirely from conveying the Program.
-
-  13. Use with the GNU Affero General Public License.
-
-  Notwithstanding any other provision of this License, you have
-permission to link or combine any covered work with a work licensed
-under version 3 of the GNU Affero General Public License into a single
-combined work, and to convey the resulting work.  The terms of this
-License will continue to apply to the part which is the covered work,
-but the special requirements of the GNU Affero General Public License,
-section 13, concerning interaction through a network will apply to the
-combination as such.
-
-  14. Revised Versions of this License.
-
-  The Free Software Foundation may publish revised and/or new versions of
-the GNU General Public License from time to time.  Such new versions will
-be similar in spirit to the present version, but may differ in detail to
-address new problems or concerns.
-
-  Each version is given a distinguishing version number.  If the
-Program specifies that a certain numbered version of the GNU General
-Public License "or any later version" applies to it, you have the
-option of following the terms and conditions either of that numbered
-version or of any later version published by the Free Software
-Foundation.  If the Program does not specify a version number of the
-GNU General Public License, you may choose any version ever published
-by the Free Software Foundation.
-
-  If the Program specifies that a proxy can decide which future
-versions of the GNU General Public License can be used, that proxy's
-public statement of acceptance of a version permanently authorizes you
-to choose that version for the Program.
-
-  Later license versions may give you additional or different
-permissions.  However, no additional obligations are imposed on any
-author or copyright holder as a result of your choosing to follow a
-later version.
-
-  15. Disclaimer of Warranty.
-
-  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
-APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
-HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
-OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
-THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
-IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
-ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
-
-  16. Limitation of Liability.
-
-  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
-WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
-THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
-GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
-USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
-DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
-PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
-EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
-SUCH DAMAGES.
-
-  17. Interpretation of Sections 15 and 16.
-
-  If the disclaimer of warranty and limitation of liability provided
-above cannot be given local legal effect according to their terms,
-reviewing courts shall apply local law that most closely approximates
-an absolute waiver of all civil liability in connection with the
-Program, unless a warranty or assumption of liability accompanies a
-copy of the Program in return for a fee.
-
-                     END OF TERMS AND CONDITIONS
-
-            How to Apply These Terms to Your New Programs
-
-  If you develop a new program, and you want it to be of the greatest
-possible use to the public, the best way to achieve this is to make it
-free software which everyone can redistribute and change under these terms.
-
-  To do so, attach the following notices to the program.  It is safest
-to attach them to the start of each source file to most effectively
-state the exclusion of warranty; and each file should have at least
-the "copyright" line and a pointer to where the full notice is found.
-
-    <one line to give the program's name and a brief idea of what it does.>
-    Copyright (C) <year>  <name of author>
-
-    This program is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-Also add information on how to contact you by electronic and paper mail.
-
-  If the program does terminal interaction, make it output a short
-notice like this when it starts in an interactive mode:
-
-    <program>  Copyright (C) <year>  <name of author>
-    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
-    This is free software, and you are welcome to redistribute it
-    under certain conditions; type `show c' for details.
-
-The hypothetical commands `show w' and `show c' should show the appropriate
-parts of the General Public License.  Of course, your program's commands
-might be different; for a GUI interface, you would use an "about box".
-
-  You should also get your employer (if you work as a programmer) or school,
-if any, to sign a "copyright disclaimer" for the program, if necessary.
-For more information on this, and how to apply and follow the GNU GPL, see
-<http://www.gnu.org/licenses/>.
-
-  The GNU General Public License does not permit incorporating your program
-into proprietary programs.  If your program is a subroutine library, you
-may consider it more useful to permit linking proprietary applications with
-the library.  If this is what you want to do, use the GNU Lesser General
-Public License instead of this License.  But first, please read
-<http://www.gnu.org/philosophy/why-not-lgpl.html>.

src/Makefile

@@ -1,8 +1,6 @@
 # Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-# Copyright (C) 2004-2007 Tord Romstad
+# Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-# Copyright (C) 2008 Marco Costalba
+# Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
-
-# This file is part of Stockfish.
 #
 # Stockfish is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -18,133 +16,499 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
-###
+### ==========================================================================
-### Files
+### Section 1. General Configuration
-###
+### ==========================================================================
 
+### Establish the operating system name
+UNAME = $(shell uname)
+
+### Executable name
 EXE = stockfish
 
-OBJS = bitboard.o pawns.o material.o endgame.o evaluate.o main.o \
+### Installation dir definitions
-	misc.o move.o movegen.o history.o movepick.o search.o piece.o \
+PREFIX = /usr/local
-	position.o direction.o tt.o value.o uci.o ucioption.o \
+# Haiku has a non-standard filesystem layout
-	mersenne.o book.o bitbase.o san.o benchmark.o
+ifeq ($(UNAME),Haiku)
+	PREFIX=/boot/common
+endif
+BINDIR = $(PREFIX)/bin
+
+### Built-in benchmark for pgo-builds
+PGOBENCH = ./$(EXE) bench 32 1 10 default depth
+
+### Object files
+OBJS = benchmark.o bitbase.o bitboard.o book.o endgame.o evaluate.o main.o \
+	material.o misc.o movegen.o movepick.o notation.o pawns.o position.o \
+	search.o thread.o timeman.o tt.o uci.o ucioption.o
+
+### ==========================================================================
+### Section 2. High-level Configuration
+### ==========================================================================
+#
+# flag                --- Comp switch --- Description
+# ----------------------------------------------------------------------------
+#
+# debug = yes/no      --- -DNDEBUG         --- Enable/Disable debug mode
+# optimize = yes/no   --- (-O3/-fast etc.) --- Enable/Disable optimizations
+# arch = (name)       --- (-arch)          --- Target architecture
+# os = (name)         ---                  --- Target operating system
+# bits = 64/32        --- -DIS_64BIT       --- 64-/32-bit operating system
+# prefetch = yes/no   --- -DUSE_PREFETCH   --- Use prefetch x86 asm-instruction
+# bsfq = yes/no       --- -DUSE_BSFQ       --- Use bsfq x86_64 asm-instruction (only
+#                                              with GCC and ICC 64-bit)
+# popcnt = yes/no     --- -DUSE_POPCNT     --- Use popcnt x86_64 asm-instruction
+#
+# Note that Makefile is space sensitive, so when adding new architectures
+# or modifying existing flags, you have to make sure there are no extra spaces
+# at the end of the line for flag values.
+
+### 2.1. General
+debug = no
+optimize = yes
+
+### 2.2 Architecture specific
+
+# General-section
+ifeq ($(ARCH),general-64)
+	arch = any
+	os = any
+	bits = 64
+	prefetch = no
+	bsfq = no
+	popcnt = no
+endif
+
+ifeq ($(ARCH),general-32)
+	arch = any
+	os = any
+	bits = 32
+	prefetch = no
+	bsfq = no
+	popcnt = no
+endif
+
+# x86-section
+ifeq ($(ARCH),x86-64)
+	arch = x86_64
+	os = any
+	bits = 64
+	prefetch = yes
+	bsfq = yes
+	popcnt = no
+endif
+
+ifeq ($(ARCH),x86-64-modern)
+	arch = x86_64
+	os = any
+	bits = 64
+	prefetch = yes
+	bsfq = yes
+	popcnt = yes
+endif
+
+ifeq ($(ARCH),x86-32)
+	arch = i386
+	os = any
+	bits = 32
+	prefetch = yes
+	bsfq = no
+	popcnt = no
+endif
+
+ifeq ($(ARCH),x86-32-old)
+	arch = i386
+	os = any
+	bits = 32
+	prefetch = no
+	bsfq = no
+	popcnt = no
+endif
+
+# osx-section
+ifeq ($(ARCH),osx-ppc-64)
+	arch = ppc64
+	os = osx
+	bits = 64
+	prefetch = no
+	bsfq = no
+	popcnt = no
+endif
+
+ifeq ($(ARCH),osx-ppc-32)
+	arch = ppc
+	os = osx
+	bits = 32
+	prefetch = no
+	bsfq = no
+	popcnt = no
+endif
+
+ifeq ($(ARCH),osx-x86-64)
+	arch = x86_64
+	os = osx
+	bits = 64
+	prefetch = yes
+	bsfq = yes
+	popcnt = no
+endif
+
+ifeq ($(ARCH),osx-x86-32)
+	arch = i386
+	os = osx
+	bits = 32
+	prefetch = yes
+	bsfq = no
+	popcnt = no
+endif
 
 
-###
+### ==========================================================================
-### Rules
+### Section 3. Low-level configuration
-###
+### ==========================================================================
+
+### 3.1 Selecting compiler (default = gcc)
+ifeq ($(COMP),)
+	COMP=gcc
+endif
+
+ifeq ($(COMP),mingw)
+	comp=mingw
+	CXX=g++
+	profile_prepare = gcc-profile-prepare
+	profile_make = gcc-profile-make
+	profile_use = gcc-profile-use
+	profile_clean = gcc-profile-clean
+endif
+
+ifeq ($(COMP),gcc)
+	comp=gcc
+	CXX=g++
+	profile_prepare = gcc-profile-prepare
+	profile_make = gcc-profile-make
+	profile_use = gcc-profile-use
+	profile_clean = gcc-profile-clean
+endif
+
+ifeq ($(COMP),icc)
+	comp=icc
+	CXX=icpc
+	profile_prepare = icc-profile-prepare
+	profile_make = icc-profile-make
+	profile_use = icc-profile-use
+	profile_clean = icc-profile-clean
+endif
+
+ifeq ($(COMP),clang)
+	comp=clang
+	CXX=clang++
+	profile_prepare = gcc-profile-prepare
+	profile_make = gcc-profile-make
+	profile_use = gcc-profile-use
+	profile_clean = gcc-profile-clean
+endif
+
+### 3.2 General compiler settings
+CXXFLAGS = -g -Wall -Wcast-qual -fno-exceptions -fno-rtti $(EXTRACXXFLAGS)
+
+ifeq ($(comp),gcc)
+	CXXFLAGS += -ansi -pedantic -Wno-long-long -Wextra -Wshadow
+endif
+
+ifeq ($(comp),mingw)
+	CXXFLAGS += -Wextra -Wshadow
+endif
+
+ifeq ($(comp),icc)
+	CXXFLAGS += -wd383,981,1418,1419,10187,10188,11505,11503 -Wcheck -Wabi -Wdeprecated -strict-ansi
+endif
+
+ifeq ($(comp),clang)
+	CXXFLAGS += -ansi -pedantic -Wno-long-long -Wextra -Wshadow
+endif
+
+ifeq ($(os),osx)
+	CXXFLAGS += -arch $(arch)
+endif
+
+### 3.3 General linker settings
+LDFLAGS = $(EXTRALDFLAGS)
+
+### On mingw use Windows threads, otherwise POSIX
+ifneq ($(comp),mingw)
+	# Haiku has pthreads in its libroot, so only link it in on other platforms
+	ifneq ($(UNAME),Haiku)
+		LDFLAGS += -lpthread
+	endif
+endif
+
+ifeq ($(os),osx)
+	LDFLAGS += -arch $(arch)
+endif
+
+### 3.4 Debugging
+ifeq ($(debug),no)
+	CXXFLAGS += -DNDEBUG
+endif
+
+### 3.5 Optimization
+ifeq ($(optimize),yes)
+
+	ifeq ($(comp),gcc)
+		CXXFLAGS += -O3
+
+		ifeq ($(os),osx)
+			ifeq ($(arch),i386)
+				CXXFLAGS += -mdynamic-no-pic
+			endif
+			ifeq ($(arch),x86_64)
+				CXXFLAGS += -mdynamic-no-pic
+			endif
+		endif
+	endif
+
+	ifeq ($(comp),mingw)
+		CXXFLAGS += -O3
+	endif
+
+	ifeq ($(comp),icc)
+		ifeq ($(os),osx)
+			CXXFLAGS += -fast -mdynamic-no-pic
+		else
+			CXXFLAGS += -O3
+		endif
+	endif
+
+	ifeq ($(comp),clang)
+		### -O4 requires a linker that supports LLVM's LTO
+		CXXFLAGS += -O3
+
+		ifeq ($(os),osx)
+			ifeq ($(arch),i386)
+				CXXFLAGS += -mdynamic-no-pic
+			endif
+			ifeq ($(arch),x86_64)
+				CXXFLAGS += -mdynamic-no-pic
+			endif
+		endif
+	endif
+endif
+
+### 3.6. Bits
+ifeq ($(bits),64)
+	CXXFLAGS += -DIS_64BIT
+endif
+
+### 3.7 prefetch
+ifeq ($(prefetch),yes)
+	CXXFLAGS += -msse
+	DEPENDFLAGS += -msse
+else
+	CXXFLAGS += -DNO_PREFETCH
+endif
+
+### 3.8 bsfq
+ifeq ($(bsfq),yes)
+	CXXFLAGS += -DUSE_BSFQ
+endif
+
+### 3.9 popcnt
+ifeq ($(popcnt),yes)
+	CXXFLAGS += -msse3 -DUSE_POPCNT
+endif
+
+### 3.10 Link Time Optimization, it works since gcc 4.5 but not on mingw.
+### This is a mix of compile and link time options because the lto link phase
+### needs access to the optimization flags.
+ifeq ($(comp),gcc)
+	ifeq ($(optimize),yes)
+		GCC_MAJOR := `$(CXX) -dumpversion | cut -f1 -d.`
+		GCC_MINOR := `$(CXX) -dumpversion | cut -f2 -d.`
+		ifeq (1,$(shell expr \( $(GCC_MAJOR) \> 4 \) \| \( $(GCC_MAJOR) \= 4 \& $(GCC_MINOR) \>= 5 \)))
+			CXXFLAGS += -flto
+			LDFLAGS += $(CXXFLAGS)
+		endif
+	endif
+endif
+
+### ==========================================================================
+### Section 4. Public targets
+### ==========================================================================
+
+help:
+	@echo ""
+	@echo "To compile stockfish, type: "
+	@echo ""
+	@echo "make target ARCH=arch [COMP=comp]"
+	@echo ""
+	@echo "Supported targets:"
+	@echo ""
+	@echo "build                > Build unoptimized version"
+	@echo "profile-build        > Build PGO-optimized version"
+	@echo "strip                > Strip executable"
+	@echo "install              > Install executable"
+	@echo "clean                > Clean up"
+	@echo "testrun              > Make sample run"
+	@echo ""
+	@echo "Supported archs:"
+	@echo ""
+	@echo "x86-64               > x86 64-bit"
+	@echo "x86-64-modern        > x86 64-bit with runtime support for popcnt instruction"
+	@echo "x86-32               > x86 32-bit excluding old hardware without SSE-support"
+	@echo "x86-32-old           > x86 32-bit including also very old hardware"
+	@echo "osx-ppc-64           > PPC-Mac OS X 64 bit"
+	@echo "osx-ppc-32           > PPC-Mac OS X 32 bit"
+	@echo "osx-x86-64           > x86-Mac OS X 64 bit"
+	@echo "osx-x86-32           > x86-Mac OS X 32 bit"
+	@echo "general-64           > unspecified 64-bit"
+	@echo "general-32           > unspecified 32-bit"
+	@echo ""
+	@echo "Supported comps:"
+	@echo ""
+	@echo "gcc                  > Gnu compiler (default)"
+	@echo "icc                  > Intel compiler"
+	@echo "mingw                > Gnu compiler with MinGW under Windows"
+	@echo "clang                > LLVM Clang compiler"
+	@echo ""
+	@echo "Non-standard targets:"
+	@echo ""
+	@echo "make hpux           >  Compile for HP-UX. Compiler = aCC"
+	@echo ""
+	@echo "Examples. If you don't know what to do, you likely want to run: "
+	@echo ""
+	@echo "make profile-build ARCH=x86-64    (This is for 64-bit systems)"
+	@echo "make profile-build ARCH=x86-32    (This is for 32-bit systems)"
+	@echo ""
+
+build:
+	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) config-sanity
+	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) all
+
+profile-build:
+	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) config-sanity
+	@echo ""
+	@echo "Step 0/4. Preparing for profile build."
+	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) $(profile_prepare)
+	@echo ""
+	@echo "Step 1/4. Building executable for benchmark ..."
+	@touch *.cpp *.h
+	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) $(profile_make)
+	@echo ""
+	@echo "Step 2/4. Running benchmark for pgo-build ..."
+	@$(PGOBENCH) > /dev/null
+	@echo ""
+	@echo "Step 3/4. Building final executable ..."
+	@touch *.cpp
+	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) $(profile_use)
+	@echo ""
+	@echo "Step 4/4. Deleting profile data ..."
+	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) $(profile_clean)
+
+strip:
+	strip $(EXE)
+
+install:
+	-mkdir -p -m 755 $(BINDIR)
+	-cp $(EXE) $(BINDIR)
+	-strip $(BINDIR)/$(EXE)
+
+clean:
+	$(RM) $(EXE) $(EXE).exe *.o .depend *~ core bench.txt *.gcda
+
+testrun:
+	@$(PGOBENCH)
+
+default:
+	help
+
+### ==========================================================================
+### Section 5. Private targets
+### ==========================================================================
 
 all: $(EXE) .depend
 
-clean:
+config-sanity:
-	$(RM) *.o .depend stockfish
+	@echo ""
-
+	@echo "Config:"
-
+	@echo "debug: '$(debug)'"
-###
+	@echo "optimize: '$(optimize)'"
-### Compiler:
+	@echo "arch: '$(arch)'"
-###
+	@echo "os: '$(os)'"
-
+	@echo "bits: '$(bits)'"
-# CXX = g++
+	@echo "prefetch: '$(prefetch)'"
-# CXX = g++-4.2
+	@echo "bsfq: '$(bsfq)'"
-CXX = icpc
+	@echo "popcnt: '$(popcnt)'"
-
+	@echo ""
-
+	@echo "Flags:"
-###
+	@echo "CXX: $(CXX)"
-### Dependencies
+	@echo "CXXFLAGS: $(CXXFLAGS)"
-###
+	@echo "LDFLAGS: $(LDFLAGS)"
+	@echo ""
+	@echo "Testing config sanity. If this fails, try 'make help' ..."
+	@echo ""
+	@test "$(debug)" = "yes" || test "$(debug)" = "no"
+	@test "$(optimize)" = "yes" || test "$(optimize)" = "no"
+	@test "$(arch)" = "any" || test "$(arch)" = "x86_64" || test "$(arch)" = "i386" || \
+	 test "$(arch)" = "ppc64" || test "$(arch)" = "ppc"
+	@test "$(os)" = "any" || test "$(os)" = "osx"
+	@test "$(bits)" = "32" || test "$(bits)" = "64"
+	@test "$(prefetch)" = "yes" || test "$(prefetch)" = "no"
+	@test "$(bsfq)" = "yes" || test "$(bsfq)" = "no"
+	@test "$(popcnt)" = "yes" || test "$(popcnt)" = "no"
+	@test "$(comp)" = "gcc" || test "$(comp)" = "icc" || test "$(comp)" = "mingw" || test "$(comp)" = "clang"
 
 $(EXE): $(OBJS)
-	$(CXX) $(LDFLAGS) -o $@ $(OBJS)
+	$(CXX) -o $@ $(OBJS) $(LDFLAGS)
+
+gcc-profile-prepare:
+	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) gcc-profile-clean
+
+gcc-profile-make:
+	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) \
+	EXTRACXXFLAGS='-fprofile-generate' \
+	EXTRALDFLAGS='-lgcov' \
+	all
+
+gcc-profile-use:
+	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) \
+	EXTRACXXFLAGS='-fprofile-use' \
+	EXTRALDFLAGS='-lgcov' \
+	all
+
+gcc-profile-clean:
+	@rm -rf *.gcda *.gcno bench.txt
+
+icc-profile-prepare:
+	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) icc-profile-clean
+	@mkdir profdir
+
+icc-profile-make:
+	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) \
+	EXTRACXXFLAGS='-prof-gen=srcpos -prof_dir ./profdir' \
+	all
+
+icc-profile-use:
+	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) \
+	EXTRACXXFLAGS='-prof_use -prof_dir ./profdir' \
+	all
+
+icc-profile-clean:
+	@rm -rf profdir bench.txt
 
 .depend:
-	$(CXX) -MM $(OBJS:.o=.cpp) > $@
+	-@$(CXX) $(DEPENDFLAGS) -MM $(OBJS:.o=.cpp) > $@ 2> /dev/null
 
-include .depend
+-include .depend
 
 
-###
+### ==========================================================================
-### Compiler and linker switches
+### Section 6. Non-standard targets
-###
+### ==========================================================================
 
-# Enable/disable debugging:
+hpux:
+	$(MAKE) \
+	CXX='/opt/aCC/bin/aCC -AA +hpxstd98 -mt +O3 -DNDEBUG -DNO_PREFETCH' \
+	CXXFLAGS="" \
+	LDFLAGS="" \
+	all
 
-CXXFLAGS += -DNDEBUG
-
-
-# Compile with full warnings, and symbol names
-
-CXXFLAGS += -Wall -g
-
-
-# General optimization flags.  Note that -O2 might be faster than -O3 on some
-# systems; this requires testing.
-
-CXXFLAGS += -O3 -fno-exceptions -fomit-frame-pointer -fno-rtti -fno-strict-aliasing
-
-# Disable most annoying warnings for the Intel C++ compiler
-
-CXXFLAGS += -wd383,869,981
-
-
-# Compiler optimization flags for the Intel C++ compiler in Mac OS X:
-
-# CXXFLAGS += -mdynamic-no-pic -no-prec-div -ipo -static -xP
-
-
-# Profiler guided optimization with the Intel C++ compiler.  To use it, first
-# create the directory ./profdata if it does not already exist, and delete its
-# contents if it does exist.  Then compile with -prof_gen, and run the
-# resulting binary for a while (for instance, do ./stockfish bench 128 1, and
-# wait 15 minutes for the benchmark to complete).  Then do a 'make clean', and
-# recompile with -prof_use.
-
-# CXXFLAGS += -prof_gen -prof_dir profdata
-# CXXFLAGS += -prof_use -prof_dir ./profdata
-
-
-# Profiler guided optimization with GCC.  I've never been able to make this
-# work.
-
-# CXXFLAGS += -fprofile-generate
-# LDFLAGS += -fprofile-generate
-# CXXFLAGS += -fprofile-use
-# CXXFLAGS += -fprofile-use
-
-
-# General linker flags
-
-LDFLAGS += -lm -lpthread
-
-
-# Compiler switches for generating binaries for various CPUs in Mac OS X.
-# Note that 'arch ppc' and 'arch ppc64' only works with g++, and not with
-# the intel compiler.
-
-# CXXFLAGS += -arch ppc
-# CXXFLAGS += -arch ppc64
-# CXXFLAGS += -arch i386
-# CXXFLAGS += -arch x86_64
-# LDFLAGS += -arch ppc
-# LDFLAGS += -arch ppc64
-# LDFLAGS += -arch i386
-# LDFLAGS += -arch x86_64
-
-
-# Backwards compatibility with Mac OS X 10.4 when compiling under 10.5 with
-# GCC 4.0.  I haven't found a way to make it work with GCC 4.2.
-
-# CXXFLAGS += -isysroot /Developer/SDKs/MacOSX10.4u.sdk
-# CXXFLAGS += -mmacosx-version-min=10.4
-# LDFLAGS += -isysroot /Developer/SDKs/MacOSX10.4u.sdk
-# LDFLAGS += -Wl,-syslibroot /Developer/SDKs/MacOSX10.4u.sdk
-# LDFLAGS += -mmacosx-version-min=10.4
-
-
-# Backwards compatibility with Mac OS X 10.4 when compiling with ICC.  Doesn't
-# work yet. :-(
-
-# CXXFLAGS += -DMAC_OS_X_VERSION_MIN_REQUIRED=1040
-# CXXFLAGS += -DMAC_OS_X_VERSION_MAX_ALLOWED=1040
-# CXXFLAGS += -D__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__=1040
-# CXXFLAGS += -F/Developer/SDKs/MacOSX10.4u.sdk/
-# LDFLAGS += -Wl,-syslibroot -Wl,/Developer/SDKs/MacOSX10.4u.sdk

src/benchmark.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,28 +17,24 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-////
-//// Includes
-////
 #include <fstream>
-#include <sstream>
+#include <iostream>
+#include <istream>
 #include <vector>
 
-#include "benchmark.h"
+#include "misc.h"
+#include "position.h"
 #include "search.h"
 #include "thread.h"
+#include "tt.h"
 #include "ucioption.h"
 
+using namespace std;
 
-////
+static const char* Defaults[] = {
-//// Variables
-////
-
-const std::string BenchmarkPositions[] = {
   "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
-  "r4rk1/1b2qppp/p1n1p3/1p6/1b1PN3/3BRN2/PP3PPP/R2Q2K1 b - - 7 16",
+  "r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 10",
-  "4r1k1/ppq3pp/3b4/2pP4/2Q1p3/4B1P1/PP5P/R5K1 b - - 0 20",
+  "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - - 0 11",
   "4rrk1/pp1n3p/3q2pQ/2p1pb2/2PP4/2P3N1/P2B2PP/4RRK1 b - - 7 19",
   "rq3rk1/ppp2ppp/1bnpb3/3N2B1/3NP3/7P/PPPQ1PP1/2KR3R w - - 7 14",
   "r1bq1r1k/1pp1n1pp/1p1p4/4p2Q/4Pp2/1BNP4/PPP2PPP/3R1RK1 w - - 2 14",
@@ -50,102 +46,97 @@ const std::string BenchmarkPositions[] = {
   "r1bq1r1k/b1p1npp1/p2p3p/1p6/3PP3/1B2NN2/PP3PPP/R2Q1RK1 w - - 1 16",
   "3r1rk1/p5pp/bpp1pp2/8/q1PP1P2/b3P3/P2NQRPP/1R2B1K1 b - - 6 22",
   "r1q2rk1/2p1bppp/2Pp4/p6b/Q1PNp3/4B3/PP1R1PPP/2K4R w - - 2 18",
-  "4k2r/1pb2ppp/1p2p3/1R1p4/3P4/2r1PN2/P4PPP/1R4K1 b  - 3 22",
+  "4k2r/1pb2ppp/1p2p3/1R1p4/3P4/2r1PN2/P4PPP/1R4K1 b - - 3 22",
   "3q2k1/pb3p1p/4pbp1/2r5/PpN2N2/1P2P2P/5PP1/Q2R2K1 b - - 4 26"
 };
 
 
-////
-//// Functions
-////
-
 /// benchmark() runs a simple benchmark by letting Stockfish analyze a set
-/// of positions for a given time each.  There are four parameters; the
+/// of positions for a given limit each. There are five parameters; the
 /// transposition table size, the number of search threads that should
-/// be used, the time in seconds spent for each position (optional, default
+/// be used, the limit value spent for each position (optional, default is
-/// is 60) and an optional file name where to look for positions in fen
+/// depth 12), an optional file name where to look for positions in fen
-/// format (default are the BenchmarkPositions defined above).
+/// format (defaults are the positions defined above) and the type of the
-/// The analysis is written to a file named bench.txt.
+/// limit value: depth (default), time in secs or number of nodes.
 
-void benchmark(const std::string& commandLine) {
+void benchmark(const Position& current, istream& is) {
 
-  std::istringstream csVal(commandLine);
+  string token;
-  std::istringstream csStr(commandLine);
+  Search::LimitsType limits;
-  std::string ttSize, threads, fileName, limitType;
+  vector<string> fens;
-  int val, secsPerPos, maxDepth, maxNodes;
 
-  csStr >> ttSize;
+  // Assign default values to missing arguments
-  csVal >> val;
+  string ttSize    = (is >> token) ? token : "128";
-  if (val < 4 || val > 1024)
+  string threads   = (is >> token) ? token : "1";
-  {
+  string limit     = (is >> token) ? token : "12";
-      std::cerr << "The hash table size must be between 4 and 1024" << std::endl;
+  string fenFile   = (is >> token) ? token : "default";
-      exit(EXIT_FAILURE);
+  string limitType = (is >> token) ? token : "depth";
-  }
-  csStr >> threads;
-  csVal >> val;
-  if (val < 1 || val > THREAD_MAX)
-  {
-      std::cerr << "The number of threads must be between 1 and " << THREAD_MAX
-                << std::endl;
-      exit(EXIT_FAILURE);
-  }
-  set_option_value("Hash", ttSize);
-  set_option_value("Threads", threads);
-  set_option_value("OwnBook", "false");
-  set_option_value("Use Search Log", "true");
-  set_option_value("Search Log Filename", "bench.txt");
 
-  csVal >> val;
+  Options["Hash"]    = ttSize;
-  csVal >> fileName;
+  Options["Threads"] = threads;
-  csVal >> limitType;
+  TT.clear();
-
-  secsPerPos = maxDepth = maxNodes = 0;
 
   if (limitType == "time")
-      secsPerPos = val * 1000;
+      limits.movetime = 1000 * atoi(limit.c_str()); // movetime is in ms
-  else if (limitType == "depth")
+
-      maxDepth = val;
+  else if (limitType == "nodes")
+      limits.nodes = atoi(limit.c_str());
+
   else
-      maxNodes = val;
+      limits.depth = atoi(limit.c_str());
 
-  std::vector<std::string> positions;
+  if (fenFile == "default")
+      fens.assign(Defaults, Defaults + 16);
 
-  if (fileName != "default")
+  else if (fenFile == "current")
+      fens.push_back(current.to_fen());
+
+  else
   {
-      std::ifstream fenFile(fileName.c_str());
+      string fen;
-      if (!fenFile.is_open())
+      ifstream file(fenFile.c_str());
+
+      if (!file.is_open())
       {
-          std::cerr << "Unable to open positions file " << fileName
+          cerr << "Unable to open file " << fenFile << endl;
-                    << std::endl;
           exit(EXIT_FAILURE);
       }
-      std::string pos;
-      while (fenFile.good())
-      {
-          std::getline(fenFile, pos);
-          if (!pos.empty())
-              positions.push_back(pos);
-      }
-      fenFile.close();
-  } else
-      for (int i = 0; i < 16; i++)
-          positions.push_back(std::string(BenchmarkPositions[i]));
 
-  int startTime = get_system_time();
+      while (getline(file, fen))
-  std::vector<std::string>::iterator it;
+          if (!fen.empty())
-  int cnt = 1;
+              fens.push_back(fen);
-  int64_t totalNodes = 0;
+
-  for (it = positions.begin(); it != positions.end(); ++it, ++cnt)
+      file.close();
+  }
+
+  int64_t nodes = 0;
+  Search::StateStackPtr st;
+  Time::point elapsed = Time::now();
+
+  for (size_t i = 0; i < fens.size(); i++)
   {
-      Move moves[1] = {MOVE_NONE};
+      Position pos(fens[i], Options["UCI_Chess960"], Threads.main_thread());
-      int dummy[2] = {0, 0};
+
-      Position pos(*it);
+      cerr << "\nPosition: " << i + 1 << '/' << fens.size() << endl;
-      std::cout << "\nProcessing position " << cnt << '/' << positions.size() << std::endl << std::endl;
+
-      think(pos, true, false, 0, dummy, dummy, 0, maxDepth, maxNodes, secsPerPos, moves);
+      if (limitType == "perft")
-      totalNodes += nodes_searched();
+      {
+          size_t cnt = Search::perft(pos, limits.depth * ONE_PLY);
+          cerr << "\nPerft " << limits.depth  << " leaf nodes: " << cnt << endl;
+          nodes += cnt;
       }
-  std::cout << "\nProcessing time (ms) " << get_system_time() - startTime << std::endl
+      else
-            << "Nodes searched " << totalNodes << std::endl
+      {
-            << "Press any key to exit" << std::endl;
+          Threads.start_searching(pos, limits, vector<Move>(), st);
-  std::cin >> fileName;
+          Threads.wait_for_search_finished();
+          nodes += Search::RootPosition.nodes_searched();
+      }
+  }
+
+  elapsed = Time::now() - elapsed + 1; // Assure positive to avoid a 'divide by zero'
+
+  cerr << "\n==========================="
+       << "\nTotal time (ms) : " << elapsed
+       << "\nNodes searched  : " << nodes
+       << "\nNodes/second    : " << 1000 * nodes / elapsed << endl;
 }

src/benchmark.h

@@ -1,37 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(BENCHMARK_H_INCLUDED)
-#define BENCHMARK_H_INCLUDED
-
-////
-//// Includes
-////
-
-#include <string>
-
-
-////
-//// Prototypes
-////
-
-extern void benchmark(const std::string& commandLine);
-
-#endif // !defined(BENCHMARK_H_INCLUDED)

src/bitbase.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,334 +17,214 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-////
-//// Includes
-////
-
 #include <cassert>
 
-#include "bitbase.h"
 #include "bitboard.h"
-#include "move.h"
+#include "types.h"
-#include "square.h"
-
-
-////
-//// Local definitions
-////
 
 namespace {
 
   enum Result {
-    RESULT_UNKNOWN,
+    INVALID = 0,
-    RESULT_INVALID,
+    UNKNOWN = 1,
-    RESULT_WIN,
+    DRAW    = 2,
-    RESULT_LOSS,
+    WIN     = 4
-    RESULT_DRAW
   };
 
+  inline Result& operator|=(Result& r, Result v) { return r = Result(r | v); }
+
   struct KPKPosition {
-    void from_index(int index);
-    int to_index() const;
-    bool is_legal() const;
-    bool is_immediate_draw() const;
-    bool is_immediate_win() const;
-    Bitboard wk_attacks() const;
-    Bitboard bk_attacks() const;
-    Bitboard pawn_attacks() const;
 
-    Square whiteKingSquare, blackKingSquare, pawnSquare;
+    Result classify_leaf(int idx);
-    Color sideToMove;
+    Result classify(int idx, Result db[]);
+
+  private:
+    template<Color Us> Result classify(const Result db[]) const;
+
+    template<Color Us> Bitboard k_attacks() const {
+      return Us == WHITE ? StepAttacksBB[W_KING][wksq] : StepAttacksBB[B_KING][bksq];
+    }
+
+    Bitboard p_attacks() const { return StepAttacksBB[W_PAWN][psq]; }
+    void decode_index(int idx);
+
+    Square wksq, bksq, psq;
+    Color stm;
   };
 
+  // The possible pawns squares are 24, the first 4 files and ranks from 2 to 7
+  const int IndexMax = 2 * 24 * 64 * 64; // stm * wp_sq * wk_sq * bk_sq = 196608
 
-  Result *Bitbase;
+  // Each uint32_t stores results of 32 positions, one per bit
-  const int IndexMax = 2*24*64*64;
+  uint32_t KPKBitbase[IndexMax / 32];
-  int UnknownCount = 0;
-
-  void initialize();
-  bool next_iteration();
-  Result classify_wtm(const KPKPosition &p);
-  Result classify_btm(const KPKPosition &p);
-  int compute_index(Square wksq, Square bksq, Square psq, Color stm);
-  int compress_result(Result r);
 
+  int index(Square wksq, Square bksq, Square psq, Color stm);
 }
 
 
-////
+uint32_t Bitbases::probe_kpk(Square wksq, Square wpsq, Square bksq, Color stm) {
-//// Functions
-////
 
-void generate_kpk_bitbase(uint8_t bitbase[]) {
+  int idx = index(wksq, bksq, wpsq, stm);
-  // Allocate array and initialize:
+  return KPKBitbase[idx / 32] & (1 << (idx & 31));
-  Bitbase = new Result[IndexMax];
-  initialize();
-
-  // Iterate until all positions are classified:
-  while(next_iteration());
-
-  // Compress bitbase into the supplied parameter:
-  int i, j, b;
-  for(i = 0; i < 24576; i++) {
-    for(b = 0, j = 0; j < 8; b |= (compress_result(Bitbase[8*i+j]) << j), j++);
-    assert(b == int(uint8_t(b)));
-    bitbase[i] = (uint8_t)b;
 }
 
-  // Release allocated memory:
+
-  delete [] Bitbase;
+void Bitbases::init_kpk() {
+
+  Result db[IndexMax];
+  KPKPosition pos;
+  int idx, bit, repeat = 1;
+
+  // Initialize table with known win / draw positions
+  for (idx = 0; idx < IndexMax; idx++)
+      db[idx] = pos.classify_leaf(idx);
+
+  // Iterate until all positions are classified (30 cycles needed)
+  while (repeat)
+      for (repeat = idx = 0; idx < IndexMax; idx++)
+          if (db[idx] == UNKNOWN && (db[idx] = pos.classify(idx, db)) != UNKNOWN)
+              repeat = 1;
+
+  // Map 32 position results into one KPKBitbase[] entry
+  for (idx = 0; idx < IndexMax / 32; idx++)
+      for (bit = 0; bit < 32; bit++)
+          if (db[32 * idx + bit] == WIN)
+              KPKBitbase[idx] |= 1 << bit;
 }
 
 
 namespace {
 
-  void KPKPosition::from_index(int index) {
+  // A KPK bitbase index is an integer in [0, IndexMax] range
-    int s;
+  //
-    sideToMove = Color(index % 2);
+  // Information is mapped in this way
-    blackKingSquare = Square((index / 2) % 64);
+  //
-    whiteKingSquare = Square((index / 128) % 64);
+  // bit     0: side to move (WHITE or BLACK)
-    s = (index / 8192) % 24;
+  // bit  1- 6: black king square (from SQ_A1 to SQ_H8)
-    pawnSquare = make_square(File(s % 4), Rank(s / 4 + 1));
+  // bit  7-12: white king square (from SQ_A1 to SQ_H8)
+  // bit 13-14: white pawn file (from FILE_A to FILE_D)
+  // bit 15-17: white pawn rank - 1 (from RANK_2 - 1 to RANK_7 - 1)
+
+  int index(Square w, Square b, Square p, Color c) {
+
+    assert(file_of(p) <= FILE_D);
+
+    return c + (b << 1) + (w << 7) + (file_of(p) << 13) + ((rank_of(p) - 1) << 15);
   }
 
+  void KPKPosition::decode_index(int idx) {
 
-  int KPKPosition::to_index() const {
+    stm  = Color(idx & 1);
-    return compute_index(whiteKingSquare, blackKingSquare, pawnSquare,
+    bksq = Square((idx >> 1) & 63);
-                         sideToMove);
+    wksq = Square((idx >> 7) & 63);
+    psq  = File((idx >> 13) & 3) | Rank((idx >> 15) + 1);
   }
 
+  Result KPKPosition::classify_leaf(int idx) {
 
-  bool KPKPosition::is_legal() const {
+    decode_index(idx);
-    if(whiteKingSquare == pawnSquare || whiteKingSquare == blackKingSquare ||
-       pawnSquare == blackKingSquare)
-      return false;
-    if(sideToMove == WHITE) {
-      if(bit_is_set(this->wk_attacks(), blackKingSquare))
-        return false;
-      if(bit_is_set(this->pawn_attacks(), blackKingSquare))
-        return false;
-    }
-    else {
-      if(bit_is_set(this->bk_attacks(), whiteKingSquare))
-        return false;
-    }
-    return true;
-  }
 
+    // Check if two pieces are on the same square or if a king can be captured
+    if (   wksq == psq || wksq == bksq || bksq == psq
+        || (k_attacks<WHITE>() & bksq)
+        || (stm == WHITE && (p_attacks() & bksq)))
+        return INVALID;
 
-  bool KPKPosition::is_immediate_draw() const {
-    if(sideToMove == BLACK) {
-      Bitboard wka = this->wk_attacks();
-      Bitboard bka = this->bk_attacks();
-
-      // Case 1: Stalemate
-      if((bka & ~(wka | this->pawn_attacks())) == EmptyBoardBB)
-        return true;
-
-      // Case 2: King can capture pawn
-      if(bit_is_set(bka, pawnSquare) && !bit_is_set(wka, pawnSquare))
-        return true;
-    }
-    else {
-      // Case 1: Stalemate
-      if(whiteKingSquare == SQ_A8 && pawnSquare == SQ_A7 &&
-         (blackKingSquare == SQ_C7 || blackKingSquare == SQ_C8))
-        return true;
-    }
-
-    return false;
-  }
-
-
-  bool KPKPosition::is_immediate_win() const {
     // The position is an immediate win if it is white to move and the white
-    // pawn can be promoted without getting captured:
+    // pawn can be promoted without getting captured.
-    return
+    if (   rank_of(psq) == RANK_7
-      sideToMove == WHITE &&
+        && stm == WHITE
-      square_rank(pawnSquare) == RANK_7 &&
+        && wksq != psq + DELTA_N
-      (square_distance(blackKingSquare, pawnSquare+DELTA_N) > 1 ||
+        && (   square_distance(bksq, psq + DELTA_N) > 1
-       bit_is_set(this->wk_attacks(), pawnSquare+DELTA_N));
+            ||(k_attacks<WHITE>() & (psq + DELTA_N))))
+        return WIN;
+
+    // Check for known draw positions
+    //
+    // Case 1: Stalemate
+    if (   stm == BLACK
+        && !(k_attacks<BLACK>() & ~(k_attacks<WHITE>() | p_attacks())))
+        return DRAW;
+
+    // Case 2: King can capture undefended pawn
+    if (   stm == BLACK
+        && (k_attacks<BLACK>() & psq & ~k_attacks<WHITE>()))
+        return DRAW;
+
+    // Case 3: Black king in front of white pawn
+    if (   bksq == psq + DELTA_N
+        && rank_of(psq) < RANK_7)
+        return DRAW;
+
+    // Case 4: White king in front of pawn and black has opposition
+    if (   stm == WHITE
+        && wksq == psq + DELTA_N
+        && bksq == wksq + DELTA_N + DELTA_N
+        && rank_of(psq) < RANK_5)
+        return DRAW;
+
+    // Case 5: Stalemate with rook pawn
+    if (   bksq == SQ_A8
+        && file_of(psq) == FILE_A)
+        return DRAW;
+
+    // Case 6: White king trapped on the rook file
+    if (   file_of(wksq) == FILE_A
+        && file_of(psq) == FILE_A
+        && rank_of(wksq) > rank_of(psq)
+        && bksq == wksq + 2)
+        return DRAW;
+
+    return UNKNOWN;
   }
 
+  template<Color Us>
+  Result KPKPosition::classify(const Result db[]) const {
 
-  Bitboard KPKPosition::wk_attacks() const {
+    // White to Move: If one move leads to a position classified as RESULT_WIN,
-    return StepAttackBB[WK][whiteKingSquare];
+    // the result of the current position is RESULT_WIN. If all moves lead to
+    // positions classified as RESULT_DRAW, the current position is classified
+    // RESULT_DRAW otherwise the current position is classified as RESULT_UNKNOWN.
+    //
+    // Black to Move: If one move leads to a position classified as RESULT_DRAW,
+    // the result of the current position is RESULT_DRAW. If all moves lead to
+    // positions classified as RESULT_WIN, the position is classified RESULT_WIN.
+    // Otherwise, the current position is classified as RESULT_UNKNOWN.
+
+    Result r = INVALID;
+    Bitboard b = k_attacks<Us>();
+
+    while (b)
+    {
+        r |= Us == WHITE ? db[index(pop_lsb(&b), bksq, psq, BLACK)]
+                         : db[index(wksq, pop_lsb(&b), psq, WHITE)];
+
+        if (Us == WHITE && (r & WIN))
+            return WIN;
+
+        if (Us == BLACK && (r & DRAW))
+            return DRAW;
     }
 
+    if (Us == WHITE && rank_of(psq) < RANK_7)
+    {
+        Square s = psq + DELTA_N;
+        r |= db[index(wksq, bksq, s, BLACK)]; // Single push
 
-  Bitboard KPKPosition::bk_attacks() const {
+        if (rank_of(s) == RANK_3 && s != wksq && s != bksq)
-    return StepAttackBB[BK][blackKingSquare];
+            r |= db[index(wksq, bksq, s + DELTA_N, BLACK)]; // Double push
+
+        if (r & WIN)
+            return WIN;
     }
 
-
+    return r & UNKNOWN ? UNKNOWN : Us == WHITE ? DRAW : WIN;
-  Bitboard KPKPosition::pawn_attacks() const {
-    return StepAttackBB[WP][pawnSquare];
   }
 
+  Result KPKPosition::classify(int idx, Result db[]) {
 
-  void initialize() {
+    decode_index(idx);
-    KPKPosition p;
+    return stm == WHITE ? classify<WHITE>(db) : classify<BLACK>(db);
-    for(int i = 0; i < IndexMax; i++) {
-      p.from_index(i);
-      if(!p.is_legal())
-        Bitbase[i] = RESULT_INVALID;
-      else if(p.is_immediate_draw())
-        Bitbase[i] = RESULT_DRAW;
-      else if(p.is_immediate_win())
-        Bitbase[i] = RESULT_WIN;
-      else {
-        Bitbase[i] = RESULT_UNKNOWN;
-        UnknownCount++;
-      }
-    }
-  }
-
-
-  bool next_iteration() {
-    KPKPosition p;
-    int previousUnknownCount = UnknownCount;
-
-    for(int i = 0; i < IndexMax; i++)
-      if(Bitbase[i] == RESULT_UNKNOWN) {
-        p.from_index(i);
-
-        Bitbase[i] = (p.sideToMove == WHITE)? classify_wtm(p) : classify_btm(p);
-
-        if(Bitbase[i] == RESULT_WIN || Bitbase[i] == RESULT_LOSS ||
-           Bitbase[i] == RESULT_DRAW)
-          UnknownCount--;
-      }
-
-    return UnknownCount != previousUnknownCount;
-  }
-
-
-  Result classify_wtm(const KPKPosition &p) {
-
-    // If one move leads to a position classified as RESULT_LOSS, the result
-    // of the current position is RESULT_WIN.  If all moves lead to positions
-    // classified as RESULT_DRAW, the current position is classified as
-    // RESULT_DRAW.  Otherwise, the current position is classified as
-    // RESULT_UNKNOWN.
-
-    bool unknownFound = false;
-    Bitboard b;
-    Square s;
-
-    // King moves
-    b = p.wk_attacks();
-    while(b) {
-      s = pop_1st_bit(&b);
-      switch(Bitbase[compute_index(s, p.blackKingSquare, p.pawnSquare,
-                                   BLACK)]) {
-      case RESULT_LOSS:
-        return RESULT_WIN;
-
-      case RESULT_UNKNOWN:
-        unknownFound = true;
-        break;
-
-      case RESULT_DRAW: case RESULT_INVALID:
-        break;
-
-      default:
-        assert(false);
-      }
-    }
-
-    // Pawn moves
-    if(square_rank(p.pawnSquare) < RANK_7) {
-      s = p.pawnSquare + DELTA_N;
-      switch(Bitbase[compute_index(p.whiteKingSquare, p.blackKingSquare, s,
-                                   BLACK)]) {
-      case RESULT_LOSS:
-        return RESULT_WIN;
-
-      case RESULT_UNKNOWN:
-        unknownFound = true;
-        break;
-
-      case RESULT_DRAW: case RESULT_INVALID:
-        break;
-
-      default:
-        assert(false);
-      }
-
-      if(square_rank(s) == RANK_3 &&
-         s != p.whiteKingSquare && s != p.blackKingSquare) {
-        s += DELTA_N;
-        switch(Bitbase[compute_index(p.whiteKingSquare, p.blackKingSquare, s,
-                                     BLACK)]) {
-        case RESULT_LOSS:
-          return RESULT_WIN;
-
-        case RESULT_UNKNOWN:
-          unknownFound = true;
-          break;
-
-        case RESULT_DRAW: case RESULT_INVALID:
-          break;
-
-        default:
-          assert(false);
-        }
-      }
-    }
-
-    return unknownFound? RESULT_UNKNOWN : RESULT_DRAW;
-  }
-
-
-  Result classify_btm(const KPKPosition &p) {
-
-    // If one move leads to a position classified as RESULT_DRAW, the result
-    // of the current position is RESULT_DRAW.  If all moves lead to positions
-    // classified as RESULT_WIN, the current position is classified as
-    // RESULT_LOSS.  Otherwise, the current position is classified as
-    // RESULT_UNKNOWN.
-
-    bool unknownFound = false;
-    Bitboard b;
-    Square s;
-
-    // King moves
-    b = p.bk_attacks();
-    while(b) {
-      s = pop_1st_bit(&b);
-      switch(Bitbase[compute_index(p.whiteKingSquare, s, p.pawnSquare,
-                                   WHITE)]) {
-      case RESULT_DRAW:
-        return RESULT_DRAW;
-
-      case RESULT_UNKNOWN:
-        unknownFound = true;
-        break;
-
-      case RESULT_WIN: case RESULT_INVALID:
-        break;
-
-      default:
-        assert(false);
-      }
-    }
-
-    return unknownFound? RESULT_UNKNOWN : RESULT_LOSS;
-  }
-
-
-  int compute_index(Square wksq, Square bksq, Square psq, Color stm) {
-    int p = int(square_file(psq)) + (int(square_rank(psq)) - 1) * 4;
-    int result = int(stm) + 2*int(bksq) + 128*int(wksq) + 8192*p;
-    assert(result >= 0 && result < IndexMax);
-    return result;
-  }
-
-
-  int compress_result(Result r) {
-    return (r == RESULT_WIN || r == RESULT_LOSS)? 1 : 0;
   }
 
 }

src/bitbase.h

@@ -1,38 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(BITBASE_H_INCLUDED)
-#define BITBASE_H_INCLUDED
-
-////
-//// Includes
-////
-
-#include "types.h"
-
-
-////
-//// Prototypes
-////
-
-extern void generate_kpk_bitbase(uint8_t bitbase[]);
-
-
-#endif // !defined(BITBASE_H_INCLUDED)

src/bitboard.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,527 +17,335 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
+#include <algorithm>
-////
+#include <cstring>
-//// Includes
-////
-
-#ifdef _MSC_VER
-    #include <intrin.h>
-    #ifdef _WIN64
-        #pragma intrinsic(_BitScanForward64)
-    #else
-        #pragma intrinsic(_BitScanForward)
-    #endif
-    #define USING_INTRINSICS
-#endif
-
 #include <iostream>
 
 #include "bitboard.h"
-#include "direction.h"
+#include "bitcount.h"
+#include "misc.h"
+#include "rkiss.h"
 
+CACHE_LINE_ALIGNMENT
 
-#if defined(USE_COMPACT_ROOK_ATTACKS)
+Bitboard RMasks[64];
+Bitboard RMagics[64];
+Bitboard* RAttacks[64];
+unsigned RShifts[64];
 
-Bitboard RankAttacks[8][64], FileAttacks[8][64];
+Bitboard BMasks[64];
+Bitboard BMagics[64];
+Bitboard* BAttacks[64];
+unsigned BShifts[64];
 
-#elif defined(USE_32BIT_ATTACKS)
+Bitboard SquareBB[64];
-
+Bitboard FileBB[8];
-const uint64_t RMult[64] = {
+Bitboard RankBB[8];
-  0xd7445cdec88002c0ULL, 0xd0a505c1f2001722ULL, 0xe065d1c896002182ULL,
+Bitboard AdjacentFilesBB[8];
-  0x9a8c41e75a000892ULL, 0x8900b10c89002aa8ULL, 0x9b28d1c1d60005a2ULL,
+Bitboard ThisAndAdjacentFilesBB[8];
-  0x15d6c88de002d9aULL, 0xb1dbfc802e8016a9ULL, 0x149a1042d9d60029ULL,
+Bitboard InFrontBB[2][8];
-  0xb9c08050599e002fULL, 0x132208c3af300403ULL, 0xc1000ce2e9c50070ULL,
+Bitboard StepAttacksBB[16][64];
-  0x9d9aa13c99020012ULL, 0xb6b078daf71e0046ULL, 0x9d880182fb6e002eULL,
-  0x52889f467e850037ULL, 0xda6dc008d19a8480ULL, 0x468286034f902420ULL,
-  0x7140ac09dc54c020ULL, 0xd76ffffa39548808ULL, 0xea901c4141500808ULL,
-  0xc91004093f953a02ULL, 0x2882afa8f6bb402ULL, 0xaebe335692442c01ULL,
-  0xe904a22079fb91eULL, 0x13a514851055f606ULL, 0x76c782018c8fe632ULL,
-  0x1dc012a9d116da06ULL, 0x3c9e0037264fffa6ULL, 0x2036002853c6e4a2ULL,
-  0xe3fe08500afb47d4ULL, 0xf38af25c86b025c2ULL, 0xc0800e2182cf9a40ULL,
-  0x72002480d1f60673ULL, 0x2500200bae6e9b53ULL, 0xc60018c1eefca252ULL,
-  0x600590473e3608aULL, 0x46002c4ab3fe51b2ULL, 0xa200011486bcc8d2ULL,
-  0xb680078095784c63ULL, 0x2742002639bf11aeULL, 0xc7d60021a5bdb142ULL,
-  0xc8c04016bb83d820ULL, 0xbd520028123b4842ULL, 0x9d1600344ac2a832ULL,
-  0x6a808005631c8a05ULL, 0x604600a148d5389aULL, 0xe2e40103d40dea65ULL,
-  0x945b5a0087c62a81ULL, 0x12dc200cd82d28eULL, 0x2431c600b5f9ef76ULL,
-  0xfb142a006a9b314aULL, 0x6870e00a1c97d62ULL, 0x2a9db2004a2689a2ULL,
-  0xd3594600caf5d1a2ULL, 0xee0e4900439344a7ULL, 0x89c4d266ca25007aULL,
-  0x3e0013a2743f97e3ULL, 0x180e31a0431378aULL, 0x3a9e465a4d42a512ULL,
-  0x98d0a11a0c0d9cc2ULL, 0x8e711c1aba19b01eULL, 0x8dcdc836dd201142ULL,
-  0x5ac08a4735370479ULL,
-};
-
-const int RShift[64] = {
-  20, 21, 21, 21, 21, 21, 21, 20, 21, 22, 22, 22, 22, 22, 22, 21,
-  21, 22, 22, 22, 22, 22, 22, 21, 21, 22, 22, 22, 22, 22, 22, 21,
-  21, 22, 22, 22, 22, 22, 22, 21, 21, 22, 22, 22, 22, 22, 22, 21,
-  21, 22, 22, 22, 22, 22, 22, 21, 20, 21, 21, 21, 21, 21, 21, 20
-};
-
-#else // if defined(USE_32BIT_ATTACKS)
-
-const uint64_t RMult[64] = {
-  0xa8002c000108020ULL, 0x4440200140003000ULL, 0x8080200010011880ULL,
-  0x380180080141000ULL, 0x1a00060008211044ULL, 0x410001000a0c0008ULL,
-  0x9500060004008100ULL, 0x100024284a20700ULL, 0x802140008000ULL,
-  0x80c01002a00840ULL, 0x402004282011020ULL, 0x9862000820420050ULL,
-  0x1001448011100ULL, 0x6432800200800400ULL, 0x40100010002000cULL,
-  0x2800d0010c080ULL, 0x90c0008000803042ULL, 0x4010004000200041ULL,
-  0x3010010200040ULL, 0xa40828028001000ULL, 0x123010008000430ULL,
-  0x24008004020080ULL, 0x60040001104802ULL, 0x582200028400d1ULL,
-  0x4000802080044000ULL, 0x408208200420308ULL, 0x610038080102000ULL,
-  0x3601000900100020ULL, 0x80080040180ULL, 0xc2020080040080ULL,
-  0x80084400100102ULL, 0x4022408200014401ULL, 0x40052040800082ULL,
-  0xb08200280804000ULL, 0x8a80a008801000ULL, 0x4000480080801000ULL,
-  0x911808800801401ULL, 0x822a003002001894ULL, 0x401068091400108aULL,
-  0x4a10a00004cULL, 0x2000800640008024ULL, 0x1486408102020020ULL,
-  0x100a000d50041ULL, 0x810050020b0020ULL, 0x204000800808004ULL,
-  0x20048100a000cULL, 0x112000831020004ULL, 0x9000040810002ULL,
-  0x440490200208200ULL, 0x8910401000200040ULL, 0x6404200050008480ULL,
-  0x4b824a2010010100ULL, 0x4080801810c0080ULL, 0x400802a0080ULL,
-  0x8224080110026400ULL, 0x40002c4104088200ULL, 0x1002100104a0282ULL,
-  0x1208400811048021ULL, 0x3201014a40d02001ULL, 0x5100019200501ULL,
-  0x101000208001005ULL, 0x2008450080702ULL, 0x1002080301d00cULL,
-  0x410201ce5c030092ULL
-};
-
-const int RShift[64] = {
-  52, 53, 53, 53, 53, 53, 53, 52, 53, 54, 54, 54, 54, 54, 54, 53,
-  53, 54, 54, 54, 54, 54, 54, 53, 53, 54, 54, 54, 54, 54, 54, 53,
-  53, 54, 54, 54, 54, 54, 54, 53, 53, 54, 54, 54, 54, 54, 54, 53,
-  53, 54, 54, 54, 54, 54, 54, 53, 52, 53, 53, 53, 53, 53, 53, 52
-};
-
-#endif // defined(USE_32BIT_ATTACKS)
-
-#if !defined(USE_COMPACT_ROOK_ATTACKS)
-Bitboard RMask[64];
-int RAttackIndex[64];
-Bitboard RAttacks[0x19000];
-#endif
-
-#if defined(USE_32BIT_ATTACKS)
-
-const uint64_t BMult[64] = {
-  0x54142844c6a22981ULL, 0x710358a6ea25c19eULL, 0x704f746d63a4a8dcULL,
-  0xbfed1a0b80f838c5ULL, 0x90561d5631e62110ULL, 0x2804260376e60944ULL,
-  0x84a656409aa76871ULL, 0xf0267f64c28b6197ULL, 0x70764ebb762f0585ULL,
-  0x92aa09e0cfe161deULL, 0x41ee1f6bb266f60eULL, 0xddcbf04f6039c444ULL,
-  0x5a3fab7bac0d988aULL, 0xd3727877fa4eaa03ULL, 0xd988402d868ddaaeULL,
-  0x812b291afa075c7cULL, 0x94faf987b685a932ULL, 0x3ed867d8470d08dbULL,
-  0x92517660b8901de8ULL, 0x2d97e43e058814b4ULL, 0x880a10c220b25582ULL,
-  0xc7c6520d1f1a0477ULL, 0xdbfc7fbcd7656aa6ULL, 0x78b1b9bfb1a2b84fULL,
-  0x2f20037f112a0bc1ULL, 0x657171ea2269a916ULL, 0xc08302b07142210eULL,
-  0x880a4403064080bULL, 0x3602420842208c00ULL, 0x852800dc7e0b6602ULL,
-  0x595a3fbbaa0f03b2ULL, 0x9f01411558159d5eULL, 0x2b4a4a5f88b394f2ULL,
-  0x4afcbffc292dd03aULL, 0x4a4094a3b3f10522ULL, 0xb06f00b491f30048ULL,
-  0xd5b3820280d77004ULL, 0x8b2e01e7c8e57a75ULL, 0x2d342794e886c2e6ULL,
-  0xc302c410cde21461ULL, 0x111f426f1379c274ULL, 0xe0569220abb31588ULL,
-  0x5026d3064d453324ULL, 0xe2076040c343cd8aULL, 0x93efd1e1738021eeULL,
-  0xb680804bed143132ULL, 0x44e361b21986944cULL, 0x44c60170ef5c598cULL,
-  0xf4da475c195c9c94ULL, 0xa3afbb5f72060b1dULL, 0xbc75f410e41c4ffcULL,
-  0xb51c099390520922ULL, 0x902c011f8f8ec368ULL, 0x950b56b3d6f5490aULL,
-  0x3909e0635bf202d0ULL, 0x5744f90206ec10ccULL, 0xdc59fd76317abbc1ULL,
-  0x881c7c67fcbfc4f6ULL, 0x47ca41e7e440d423ULL, 0xeb0c88112048d004ULL,
-  0x51c60e04359aef1aULL, 0x1aa1fe0e957a5554ULL, 0xdd9448db4f5e3104ULL,
-  0xdc01f6dca4bebbdcULL,
-};
-
-const int BShift[64] = {
-  26, 27, 27, 27, 27, 27, 27, 26, 27, 27, 27, 27, 27, 27, 27, 27,
-  27, 27, 25, 25, 25, 25, 27, 27, 27, 27, 25, 23, 23, 25, 27, 27,
-  27, 27, 25, 23, 23, 25, 27, 27, 27, 27, 25, 25, 25, 25, 27, 27,
-  27, 27, 27, 27, 27, 27, 27, 27, 26, 27, 27, 27, 27, 27, 27, 26
-};
-
-#else // if defined(USE_32BIT_ATTACKS)
-
-const uint64_t BMult[64] = {
-  0x440049104032280ULL, 0x1021023c82008040ULL, 0x404040082000048ULL,
-  0x48c4440084048090ULL, 0x2801104026490000ULL, 0x4100880442040800ULL,
-  0x181011002e06040ULL, 0x9101004104200e00ULL, 0x1240848848310401ULL,
-  0x2000142828050024ULL, 0x1004024d5000ULL, 0x102044400800200ULL,
-  0x8108108820112000ULL, 0xa880818210c00046ULL, 0x4008008801082000ULL,
-  0x60882404049400ULL, 0x104402004240810ULL, 0xa002084250200ULL,
-  0x100b0880801100ULL, 0x4080201220101ULL, 0x44008080a00000ULL,
-  0x202200842000ULL, 0x5006004882d00808ULL, 0x200045080802ULL,
-  0x86100020200601ULL, 0xa802080a20112c02ULL, 0x80411218080900ULL,
-  0x200a0880080a0ULL, 0x9a01010000104000ULL, 0x28008003100080ULL,
-  0x211021004480417ULL, 0x401004188220806ULL, 0x825051400c2006ULL,
-  0x140c0210943000ULL, 0x242800300080ULL, 0xc2208120080200ULL,
-  0x2430008200002200ULL, 0x1010100112008040ULL, 0x8141050100020842ULL,
-  0x822081014405ULL, 0x800c049e40400804ULL, 0x4a0404028a000820ULL,
-  0x22060201041200ULL, 0x360904200840801ULL, 0x881a08208800400ULL,
-  0x60202c00400420ULL, 0x1204440086061400ULL, 0x8184042804040ULL,
-  0x64040315300400ULL, 0xc01008801090a00ULL, 0x808010401140c00ULL,
-  0x4004830c2020040ULL, 0x80005002020054ULL, 0x40000c14481a0490ULL,
-  0x10500101042048ULL, 0x1010100200424000ULL, 0x640901901040ULL,
-  0xa0201014840ULL, 0x840082aa011002ULL, 0x10010840084240aULL,
-  0x420400810420608ULL, 0x8d40230408102100ULL, 0x4a00200612222409ULL,
-  0xa08520292120600ULL
-};
-
-const int BShift[64] = {
-  58, 59, 59, 59, 59, 59, 59, 58, 59, 59, 59, 59, 59, 59, 59, 59,
-  59, 59, 57, 57, 57, 57, 59, 59, 59, 59, 57, 55, 55, 57, 59, 59,
-  59, 59, 57, 55, 55, 57, 59, 59, 59, 59, 57, 57, 57, 57, 59, 59,
-  59, 59, 59, 59, 59, 59, 59, 59, 58, 59, 59, 59, 59, 59, 59, 58
-};
-
-#endif // defined(USE_32BIT_ATTACKS)
-
-Bitboard BMask[64];
-int BAttackIndex[64];
-Bitboard BAttacks[0x1480];
-
-Bitboard SetMaskBB[65];
-Bitboard ClearMaskBB[65];
-
-Bitboard StepAttackBB[16][64];
-Bitboard RayBB[64][8];
 Bitboard BetweenBB[64][64];
-
+Bitboard DistanceRingsBB[64][8];
+Bitboard ForwardBB[2][64];
 Bitboard PassedPawnMask[2][64];
-Bitboard OutpostMask[2][64];
+Bitboard AttackSpanMask[2][64];
+Bitboard PseudoAttacks[6][64];
 
-Bitboard BishopPseudoAttacks[64];
+int SquareDistance[64][64];
-Bitboard RookPseudoAttacks[64];
-Bitboard QueenPseudoAttacks[64];
-
-
-////
-//// Local definitions
-////
 
 namespace {
 
-  void init_masks();
+  // De Bruijn sequences. See chessprogramming.wikispaces.com/BitScan
-  void init_ray_bitboards();
+  const uint64_t DeBruijn_64 = 0x218A392CD3D5DBFULL;
-  void init_attacks();
+  const uint32_t DeBruijn_32 = 0x783A9B23;
-  void init_between_bitboards();
+
-  Bitboard sliding_attacks(int sq, Bitboard block, int dirs, int deltas[][2],
+  CACHE_LINE_ALIGNMENT
-                           int fmin, int fmax, int rmin, int rmax);
+
-  Bitboard index_to_bitboard(int index, Bitboard mask);
+  int MS1BTable[256];
-  void init_sliding_attacks(Bitboard attacks[],
+  Square BSFTable[64];
-                            int attackIndex[], Bitboard mask[],
+  Bitboard RTable[0x19000]; // Storage space for rook attacks
-                            const int shift[2], const Bitboard mult[],
+  Bitboard BTable[0x1480];  // Storage space for bishop attacks
-                            int deltas[][2]);
+  uint8_t BitCount8Bit[256];
-  void init_pseudo_attacks();
+
-#if defined(USE_COMPACT_ROOK_ATTACKS)
+  typedef unsigned (Fn)(Square, Bitboard);
-  void init_file_and_rank_attacks();
+
-#endif
+  void init_magics(Bitboard table[], Bitboard* attacks[], Bitboard magics[],
+                   Bitboard masks[], unsigned shifts[], Square deltas[], Fn index);
+
+  FORCE_INLINE unsigned bsf_index(Bitboard b) {
+
+    if (Is64Bit)
+        return ((b & -b) * DeBruijn_64) >> 58;
+
+    // Use Matt Taylor's folding trick for 32 bit systems
+    b ^= (b - 1);
+    return ((unsigned(b) ^ unsigned(b >> 32)) * DeBruijn_32) >> 26;
+  }
 }
 
+/// lsb()/msb() finds the least/most significant bit in a nonzero bitboard.
+/// pop_lsb() finds and clears the least significant bit in a nonzero bitboard.
 
-////
+#if !defined(USE_BSFQ)
-//// Functions
-////
 
-/// print_bitboard() prints a bitboard in an easily readable format to the
+Square lsb(Bitboard b) { return BSFTable[bsf_index(b)]; }
+
+Square pop_lsb(Bitboard* b) {
+
+  Bitboard bb = *b;
+  *b = bb & (bb - 1);
+  return BSFTable[bsf_index(bb)];
+}
+
+Square msb(Bitboard b) {
+
+  unsigned b32;
+  int result = 0;
+
+  if (b > 0xFFFFFFFF)
+  {
+      b >>= 32;
+      result = 32;
+  }
+
+  b32 = unsigned(b);
+
+  if (b32 > 0xFFFF)
+  {
+      b32 >>= 16;
+      result += 16;
+  }
+
+  if (b32 > 0xFF)
+  {
+      b32 >>= 8;
+      result += 8;
+  }
+
+  return (Square)(result + MS1BTable[b32]);
+}
+
+#endif // !defined(USE_BSFQ)
+
+
+/// Bitboards::print() prints a bitboard in an easily readable format to the
 /// standard output. This is sometimes useful for debugging.
 
-void print_bitboard(Bitboard b) {
+void Bitboards::print(Bitboard b) {
-  for(Rank r = RANK_8; r >= RANK_1; r--) {
+
-    std::cout << "+---+---+---+---+---+---+---+---+" << std::endl;
+  sync_cout;
-    for(File f = FILE_A; f <= FILE_H; f++)
+
-      std::cout << "| " << (bit_is_set(b, make_square(f, r))? 'X' : ' ') << ' ';
+  for (Rank rank = RANK_8; rank >= RANK_1; rank--)
-    std::cout << "|" << std::endl;
+  {
+      std::cout << "+---+---+---+---+---+---+---+---+" << '\n';
+
+      for (File file = FILE_A; file <= FILE_H; file++)
+          std::cout << "| " << (b & (file | rank) ? "X " : "  ");
+
+      std::cout << "|\n";
   }
-  std::cout << "+---+---+---+---+---+---+---+---+" << std::endl;
+  std::cout << "+---+---+---+---+---+---+---+---+" << sync_endl;
 }
 
 
-/// init_bitboards() initializes various bitboard arrays.  It is called during
+/// Bitboards::init() initializes various bitboard arrays. It is called during
 /// program initialization.
 
-void init_bitboards() {
+void Bitboards::init() {
-  int rookDeltas[4][2] = {{0,1},{0,-1},{1,0},{-1,0}};
-  int bishopDeltas[4][2] = {{1,1},{-1,1},{1,-1},{-1,-1}};
-  init_masks();
-  init_ray_bitboards();
-  init_attacks();
-  init_between_bitboards();
-#if defined(USE_COMPACT_ROOK_ATTACKS)
-  init_file_and_rank_attacks();
-#else
-  init_sliding_attacks(RAttacks, RAttackIndex, RMask, RShift,
-                       RMult, rookDeltas);
-#endif
-  init_sliding_attacks(BAttacks, BAttackIndex, BMask, BShift,
-                       BMult, bishopDeltas);
-  init_pseudo_attacks();
-}
 
+  for (int k = 0, i = 0; i < 8; i++)
+      while (k < (2 << i))
+          MS1BTable[k++] = i;
 
-#if defined(USE_FOLDED_BITSCAN)
+  for (int i = 0; i < 64; i++)
+      BSFTable[bsf_index(1ULL << i)] = Square(i);
 
-static const int BitTable[64] = {
+  for (Bitboard b = 0; b < 256; b++)
-  63, 30, 3, 32, 25, 41, 22, 33, 15, 50, 42, 13, 11, 53, 19, 34, 61, 29, 2,
+      BitCount8Bit[b] = (uint8_t)popcount<Max15>(b);
-  51, 21, 43, 45, 10, 18, 47, 1, 54, 9, 57, 0, 35, 62, 31, 40, 4, 49, 5, 52,
-  26, 60, 6, 23, 44, 46, 27, 56, 16, 7, 39, 48, 24, 59, 14, 12, 55, 38, 28,
-  58, 20, 37, 17, 36, 8
-};
 
+  for (Square s = SQ_A1; s <= SQ_H8; s++)
+      SquareBB[s] = 1ULL << s;
 
-/// first_1() finds the least significant nonzero bit in a nonzero bitboard.
+  FileBB[FILE_A] = FileABB;
+  RankBB[RANK_1] = Rank1BB;
 
-Square first_1(Bitboard b) {
+  for (int i = 1; i < 8; i++)
-  b ^= (b - 1);
-  uint32_t fold = int(b) ^ int(b >> 32);
-  return Square(BitTable[(fold * 0x783a9b23) >> 26]);
-}
-
-
-/// pop_1st_bit() finds and clears the least significant nonzero bit in a
-/// nonzero bitboard.
-
-#if defined(USE_32BIT_ATTACKS)
-
-// Use type-punning
-union b_union {
-
-    Bitboard b;
-    struct {
-        uint32_t l;
-        uint32_t h;
-    };
-};
-
-// WARNING: Needs -fno-strict-aliasing compiler option
-Square pop_1st_bit(Bitboard *bb) {
-
-  b_union u;
-  uint32_t b;
-
-  u.b = *bb;
-
-  if (u.l)
   {
-      b = u.l;
+      FileBB[i] = FileBB[i - 1] << 1;
-      *((uint32_t*)bb) = b & (b - 1);
+      RankBB[i] = RankBB[i - 1] << 8;
-      b ^= (b - 1);
   }
-  else
+
+  for (File f = FILE_A; f <= FILE_H; f++)
   {
-      b = u.h;
+      AdjacentFilesBB[f] = (f > FILE_A ? FileBB[f - 1] : 0) | (f < FILE_H ? FileBB[f + 1] : 0);
-      *((uint32_t*)bb+1) = b & (b - 1); // Little endian only?
+      ThisAndAdjacentFilesBB[f] = FileBB[f] | AdjacentFilesBB[f];
-      b = ~(b ^ (b - 1));
-  }
-  return Square(BitTable[(b * 0x783a9b23) >> 26]);
   }
 
-#else
+  for (Rank r = RANK_1; r < RANK_8; r++)
+      InFrontBB[WHITE][r] = ~(InFrontBB[BLACK][r + 1] = InFrontBB[BLACK][r] | RankBB[r]);
 
-Square pop_1st_bit(Bitboard *b) {
+  for (Color c = WHITE; c <= BLACK; c++)
-  Bitboard bb = *b ^ (*b - 1);
+      for (Square s = SQ_A1; s <= SQ_H8; s++)
-  uint32_t fold = int(bb) ^ int(bb >> 32);
+      {
-  *b &= (*b - 1);
+          ForwardBB[c][s]      = InFrontBB[c][rank_of(s)] & FileBB[file_of(s)];
-  return Square(BitTable[(fold * 0x783a9b23) >> 26]);
+          PassedPawnMask[c][s] = InFrontBB[c][rank_of(s)] & ThisAndAdjacentFilesBB[file_of(s)];
+          AttackSpanMask[c][s] = InFrontBB[c][rank_of(s)] & AdjacentFilesBB[file_of(s)];
       }
 
-#endif
+  for (Square s1 = SQ_A1; s1 <= SQ_H8; s1++)
+      for (Square s2 = SQ_A1; s2 <= SQ_H8; s2++)
+          SquareDistance[s1][s2] = std::max(file_distance(s1, s2), rank_distance(s1, s2));
 
-#else
+  for (Square s1 = SQ_A1; s1 <= SQ_H8; s1++)
+      for (int d = 1; d < 8; d++)
+          for (Square s2 = SQ_A1; s2 <= SQ_H8; s2++)
+              if (SquareDistance[s1][s2] == d)
+                  DistanceRingsBB[s1][d - 1] |= s2;
 
-static const int BitTable[64] = {
+  int steps[][9] = { {}, { 7, 9 }, { 17, 15, 10, 6, -6, -10, -15, -17 },
-  0, 1, 2, 7, 3, 13, 8, 19, 4, 25, 14, 28, 9, 34, 20, 40, 5, 17, 26, 38, 15,
+                     {}, {}, {}, { 9, 7, -7, -9, 8, 1, -1, -8 } };
-  46, 29, 48, 10, 31, 35, 54, 21, 50, 41, 57, 63, 6, 12, 18, 24, 27, 33, 39,
-  16, 37, 45, 47, 30, 53, 49, 56, 62, 11, 23, 32, 36, 44, 52, 55, 61, 22, 43,
-  51, 60, 42, 59, 58
-};
 
+  for (Color c = WHITE; c <= BLACK; c++)
+      for (PieceType pt = PAWN; pt <= KING; pt++)
+          for (Square s = SQ_A1; s <= SQ_H8; s++)
+              for (int k = 0; steps[pt][k]; k++)
+              {
+                  Square to = s + Square(c == WHITE ? steps[pt][k] : -steps[pt][k]);
 
-/// first_1() finds the least significant nonzero bit in a nonzero bitboard.
+                  if (is_ok(to) && square_distance(s, to) < 3)
-
+                      StepAttacksBB[make_piece(c, pt)][s] |= to;
-Square first_1(Bitboard b) {
-  return Square(BitTable[((b & -b) * 0x218a392cd3d5dbfULL) >> 58]);
               }
 
+  Square RDeltas[] = { DELTA_N,  DELTA_E,  DELTA_S,  DELTA_W  };
+  Square BDeltas[] = { DELTA_NE, DELTA_SE, DELTA_SW, DELTA_NW };
 
-/// pop_1st_bit() finds and clears the least significant nonzero bit in a
+  init_magics(RTable, RAttacks, RMagics, RMasks, RShifts, RDeltas, magic_index<ROOK>);
-/// nonzero bitboard.
+  init_magics(BTable, BAttacks, BMagics, BMasks, BShifts, BDeltas, magic_index<BISHOP>);
 
-Square pop_1st_bit(Bitboard *b) {
+  for (Square s = SQ_A1; s <= SQ_H8; s++)
-  Bitboard bb = *b;
+  {
-  *b &= (*b - 1);
+      PseudoAttacks[QUEEN][s]  = PseudoAttacks[BISHOP][s] = attacks_bb<BISHOP>(s, 0);
-  return Square(BitTable[((bb & -bb) * 0x218a392cd3d5dbfULL) >> 58]);
+      PseudoAttacks[QUEEN][s] |= PseudoAttacks[  ROOK][s] = attacks_bb<  ROOK>(s, 0);
   }
 
-#endif // defined(USE_FOLDED_BITSCAN)
+  for (Square s1 = SQ_A1; s1 <= SQ_H8; s1++)
+      for (Square s2 = SQ_A1; s2 <= SQ_H8; s2++)
+          if (PseudoAttacks[QUEEN][s1] & s2)
+          {
+              Square delta = (s2 - s1) / square_distance(s1, s2);
+
+              for (Square s = s1 + delta; s != s2; s += delta)
+                  BetweenBB[s1][s2] |= s;
+          }
+}
 
 
 namespace {
 
-  // All functions below are used to precompute various bitboards during
+  Bitboard sliding_attack(Square deltas[], Square sq, Bitboard occupied) {
-  // program initialization.  Some of the functions may be difficult to
-  // understand, but they all seem to work correctly, and it should never
-  // be necessary to touch any of them.
 
-  void init_masks() {
+    Bitboard attack = 0;
-    SetMaskBB[SQ_NONE] = 0ULL;
+
-    ClearMaskBB[SQ_NONE] = ~SetMaskBB[SQ_NONE];
+    for (int i = 0; i < 4; i++)
-    for(Square s = SQ_A1; s <= SQ_H8; s++) {
+        for (Square s = sq + deltas[i];
-      SetMaskBB[s] = (1ULL << s);
+             is_ok(s) && square_distance(s, s - deltas[i]) == 1;
-      ClearMaskBB[s] = ~SetMaskBB[s];
+             s += deltas[i])
-    }
+        {
-    for(Color c = WHITE; c <= BLACK; c++)
+            attack |= s;
-      for(Square s = SQ_A1; s <= SQ_H8; s++) {
+
-        PassedPawnMask[c][s] =
+            if (occupied & s)
-          in_front_bb(c, s) & this_and_neighboring_files_bb(s);
+                break;
-        OutpostMask[c][s] = in_front_bb(c, s) & neighboring_files_bb(s);
         }
+
+    return attack;
   }
 
 
-  void init_ray_bitboards() {
+  Bitboard pick_random(RKISS& rk, int booster) {
-    int d[8] = {1, -1, 16, -16, 17, -17, 15, -15};
+
-    for(int i = 0; i < 128; i = (i + 9) & ~8) {
+    // Values s1 and s2 are used to rotate the candidate magic of a
-      for(int j = 0; j < 8; j++) {
+    // quantity known to be the optimal to quickly find the magics.
-        RayBB[(i&7)|((i>>4)<<3)][j] = EmptyBoardBB;
+    int s1 = booster & 63, s2 = (booster >> 6) & 63;
-        for(int k = i + d[j]; (k & 0x88) == 0; k += d[j])
+
-          set_bit(&(RayBB[(i&7)|((i>>4)<<3)][j]), Square((k&7)|((k>>4)<<3)));
+    Bitboard m = rk.rand<Bitboard>();
-      }
+    m = (m >> s1) | (m << (64 - s1));
-    }
+    m &= rk.rand<Bitboard>();
+    m = (m >> s2) | (m << (64 - s2));
+    return m & rk.rand<Bitboard>();
   }
 
 
-  void init_attacks() {
+  // init_magics() computes all rook and bishop attacks at startup. Magic
-    int i, j, k, l;
+  // bitboards are used to look up attacks of sliding pieces. As a reference see
-    int step[16][8] =  {
+  // chessprogramming.wikispaces.com/Magic+Bitboards. In particular, here we
-      {0},
+  // use the so called "fancy" approach.
-      {7,9,0}, {17,15,10,6,-6,-10,-15,-17}, {9,7,-7,-9,0}, {8,1,-1,-8,0},
-      {9,7,-7,-9,8,1,-1,-8}, {9,7,-7,-9,8,1,-1,-8}, {0}, {0},
-      {-7,-9,0}, {17,15,10,6,-6,-10,-15,-17}, {9,7,-7,-9,0}, {8,1,-1,-8,0},
-      {9,7,-7,-9,8,1,-1,-8}, {9,7,-7,-9,8,1,-1,-8}
-    };
 
-    for(i = 0; i < 64; i++) {
+  void init_magics(Bitboard table[], Bitboard* attacks[], Bitboard magics[],
-      for(j = 0; j <= int(BK); j++) {
+                   Bitboard masks[], unsigned shifts[], Square deltas[], Fn index) {
-        StepAttackBB[j][i] = EmptyBoardBB;
-        for(k = 0; k < 8 && step[j][k] != 0; k++) {
-          l = i + step[j][k];
-          if(l >= 0 && l < 64 && abs((i&7) - (l&7)) < 3)
-            StepAttackBB[j][i] |= (1ULL << l);
-        }
-      }
-    }
-  }
 
+    int MagicBoosters[][8] = { { 3191, 2184, 1310, 3618, 2091, 1308, 2452, 3996 },
+                               { 1059, 3608,  605, 3234, 3326,   38, 2029, 3043 } };
+    RKISS rk;
+    Bitboard occupancy[4096], reference[4096], edges, b;
+    int i, size, booster;
 
-  Bitboard sliding_attacks(int sq, Bitboard block, int dirs, int deltas[][2],
+    // attacks[s] is a pointer to the beginning of the attacks table for square 's'
-                           int fmin=0, int fmax=7, int rmin=0, int rmax=7) {
+    attacks[SQ_A1] = table;
-    Bitboard result = 0ULL;
-    int rk = sq / 8, fl = sq % 8, r, f, i;
-    for(i = 0; i < dirs; i++) {
-      int dx = deltas[i][0], dy = deltas[i][1];
-      for(f = fl+dx, r = rk+dy;
-          (dx==0 || (f>=fmin && f<=fmax)) && (dy==0 || (r>=rmin && r<=rmax));
-          f += dx, r += dy) {
-        result |= (1ULL << (f + r*8));
-        if(block & (1ULL << (f + r*8))) break;
-      }
-    }
-    return result;
-  }
 
+    for (Square s = SQ_A1; s <= SQ_H8; s++)
+    {
+        // Board edges are not considered in the relevant occupancies
+        edges = ((Rank1BB | Rank8BB) & ~rank_bb(s)) | ((FileABB | FileHBB) & ~file_bb(s));
 
-  void init_between_bitboards() {
+        // Given a square 's', the mask is the bitboard of sliding attacks from
-    SquareDelta step[8] = {
+        // 's' computed on an empty board. The index must be big enough to contain
-      DELTA_E, DELTA_W, DELTA_N, DELTA_S, DELTA_NE, DELTA_SW, DELTA_NW, DELTA_SE
+        // all the attacks for each possible subset of the mask and so is 2 power
-    };
+        // the number of 1s of the mask. Hence we deduce the size of the shift to
-    SignedDirection d;
+        // apply to the 64 or 32 bits word to get the index.
-    for(Square s1 = SQ_A1; s1 <= SQ_H8; s1++)
+        masks[s]  = sliding_attack(deltas, s, 0) & ~edges;
-      for(Square s2 = SQ_A1; s2 <= SQ_H8; s2++) {
+        shifts[s] = (Is64Bit ? 64 : 32) - popcount<Max15>(masks[s]);
-        BetweenBB[s1][s2] = EmptyBoardBB;
-        d = signed_direction_between_squares(s1, s2);
-        if(d != SIGNED_DIR_NONE)
-          for(Square s3 = s1 + step[d]; s3 != s2; s3 += step[d])
-            set_bit(&(BetweenBB[s1][s2]), s3);
-      }
-  }
 
+        // Use Carry-Rippler trick to enumerate all subsets of masks[s] and
+        // store the corresponding sliding attack bitboard in reference[].
+        b = size = 0;
+        do {
+            occupancy[size] = b;
+            reference[size++] = sliding_attack(deltas, s, b);
+            b = (b - masks[s]) & masks[s];
+        } while (b);
 
-  Bitboard index_to_bitboard(int index, Bitboard mask) {
+        // Set the offset for the table of the next square. We have individual
-    int i, j, bits = count_1s(mask);
+        // table sizes for each square with "Fancy Magic Bitboards".
-    Bitboard result = 0ULL;
+        if (s < SQ_H8)
-    for(i = 0; i < bits; i++) {
+            attacks[s + 1] = attacks[s] + size;
-      j = pop_1st_bit(&mask);
-      if(index & (1 << i)) result |= (1ULL << j);
-    }
-    return result;
-  }
 
+        booster = MagicBoosters[Is64Bit][rank_of(s)];
 
-  void init_sliding_attacks(Bitboard attacks[],
+        // Find a magic for square 's' picking up an (almost) random number
-                            int attackIndex[], Bitboard mask[],
+        // until we find the one that passes the verification test.
-                            const int shift[2], const Bitboard mult[],
+        do {
-                            int deltas[][2]) {
+            do magics[s] = pick_random(rk, booster);
-    int i, j, k, index = 0;
+            while (BitCount8Bit[(magics[s] * masks[s]) >> 56] < 6);
-    Bitboard b;
-    for(i = 0; i < 64; i++) {
-      attackIndex[i] = index;
-      mask[i] = sliding_attacks(i, 0ULL, 4, deltas, 1, 6, 1, 6);
 
-#if defined(USE_32BIT_ATTACKS)
+            memset(attacks[s], 0, size * sizeof(Bitboard));
-      j = (1 << (32 - shift[i]));
-#else
-      j = (1 << (64 - shift[i]));
-#endif
 
-      for(k = 0; k < j; k++) {
+            // A good magic must map every possible occupancy to an index that
+            // looks up the correct sliding attack in the attacks[s] database.
+            // Note that we build up the database for square 's' as a side
+            // effect of verifying the magic.
+            for (i = 0; i < size; i++)
+            {
+                Bitboard& attack = attacks[s][index(s, occupancy[i])];
 
-#if defined(USE_32BIT_ATTACKS)
+                if (attack && attack != reference[i])
-        b = index_to_bitboard(k, mask[i]);
+                    break;
-        attacks[index +
-                 (unsigned(int(b) * int(mult[i]) ^
-                           int(b >> 32) * int(mult[i] >> 32))
-                  >> shift[i])] =
-          sliding_attacks(i, b, 4, deltas);
-#else
-        b = index_to_bitboard(k, mask[i]);
-        attacks[index + ((b * mult[i]) >> shift[i])] =
-          sliding_attacks(i, b, 4, deltas);
-#endif
-      }
-      index += j;
-    }
-  }
 
+                assert(reference[i] != 0);
 
-  void init_pseudo_attacks() {
+                attack = reference[i];
-    Square s;
-    for(s = SQ_A1; s <= SQ_H8; s++) {
-      BishopPseudoAttacks[s] = bishop_attacks_bb(s, EmptyBoardBB);
-      RookPseudoAttacks[s] = rook_attacks_bb(s, EmptyBoardBB);
-      QueenPseudoAttacks[s] = queen_attacks_bb(s, EmptyBoardBB);
             }
-  }
+        } while (i != size);
-
-#if defined(USE_COMPACT_ROOK_ATTACKS)
-  void init_file_and_rank_attacks() {
-    int i, j, k, l, m, s;
-    Bitboard b1, b2;
-    for(i = 0; i < 64; i++) {
-
-      for(m = 0; m <= 1; m++) {
-        b1 = 0ULL;
-        for(j = 0; j < 6; j++) if(i & (1<<j)) b1 |= (1ULL << ((j+1)*(1+m*7)));
-        for(j = 0; j < 8; j++) {
-          b2 = 0ULL;
-          for(k = 0, s = 1; k < 2; k++, s *= -1) {
-            for(l = j+s; l >= 0 && l <= 7; l += s) {
-              b2 |= (m? RankBB[l] : FileBB[l]);
-              if(b1 & (1ULL << (l*(1+m*7)))) break;
-            }
-          }
-          if(m) FileAttacks[j][(b1*0xd6e8802041d0c441ULL) >> 58] = b2;
-          else RankAttacks[j][i] = b2;
     }
   }
 }
-  }
-#endif // defined(USE_COMPACT_ROOK_ATTACKS)
-
-}

src/bitboard.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -18,203 +18,92 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(BITBOARD_H_INCLUDED)
 #define BITBOARD_H_INCLUDED
 
-
-////
-//// Defines
-////
-
-// Comment following define if you prefer manually adjust
-// platform macros defined below
-#define AUTO_CONFIGURATION
-
-// Quiet a warning on Intel compiler
-#if !defined(__SIZEOF_INT__ )
-#define __SIZEOF_INT__ 0
-#endif
-
-// Check for 64 bits for different compilers: Intel, MSVC and gcc
-#if defined(__x86_64) || defined(_WIN64) || (__SIZEOF_INT__ > 4)
-#define IS_64BIT
-#endif
-
-#if !defined(AUTO_CONFIGURATION) || defined(IS_64BIT)
-
-//#define USE_COMPACT_ROOK_ATTACKS
-//#define USE_32BIT_ATTACKS
-#define USE_FOLDED_BITSCAN
-
-#define BITCOUNT_SWAR_64
-//#define BITCOUNT_SWAR_32
-//#define BITCOUNT_LOOP
-
-#else
-
-#define USE_32BIT_ATTACKS
-#define USE_FOLDED_BITSCAN
-#define BITCOUNT_SWAR_32
-
-#endif
-
-////
-//// Includes
-////
-
-#include "direction.h"
-#include "piece.h"
-#include "square.h"
 #include "types.h"
 
+namespace Bitboards {
 
-////
+void init();
-//// Types
+void print(Bitboard b);
-////
 
-typedef uint64_t Bitboard;
-
-
-////
-//// Constants and variables
-////
-
-const Bitboard EmptyBoardBB = 0ULL;
-
-const Bitboard WhiteSquaresBB = 0x55AA55AA55AA55AAULL;
-const Bitboard BlackSquaresBB = 0xAA55AA55AA55AA55ULL;
-const Bitboard SquaresByColorBB[2] = { BlackSquaresBB, WhiteSquaresBB };
-
-const Bitboard FileABB = 0x0101010101010101ULL;
-const Bitboard FileBBB = 0x0202020202020202ULL;
-const Bitboard FileCBB = 0x0404040404040404ULL;
-const Bitboard FileDBB = 0x0808080808080808ULL;
-const Bitboard FileEBB = 0x1010101010101010ULL;
-const Bitboard FileFBB = 0x2020202020202020ULL;
-const Bitboard FileGBB = 0x4040404040404040ULL;
-const Bitboard FileHBB = 0x8080808080808080ULL;
-
-const Bitboard FileBB[8] = {
-  FileABB, FileBBB, FileCBB, FileDBB, FileEBB, FileFBB, FileGBB, FileHBB
-};
-
-const Bitboard NeighboringFilesBB[8] = {
-  FileBBB, FileABB|FileCBB, FileBBB|FileDBB, FileCBB|FileEBB,
-  FileDBB|FileFBB, FileEBB|FileGBB, FileFBB|FileHBB, FileGBB
-};
-
-const Bitboard ThisAndNeighboringFilesBB[8] = {
-  FileABB|FileBBB, FileABB|FileBBB|FileCBB,
-  FileBBB|FileCBB|FileDBB, FileCBB|FileDBB|FileEBB,
-  FileDBB|FileEBB|FileFBB, FileEBB|FileFBB|FileGBB,
-  FileFBB|FileGBB|FileHBB, FileGBB|FileHBB
-};
-
-const Bitboard Rank1BB = 0xFFULL;
-const Bitboard Rank2BB = 0xFF00ULL;
-const Bitboard Rank3BB = 0xFF0000ULL;
-const Bitboard Rank4BB = 0xFF000000ULL;
-const Bitboard Rank5BB = 0xFF00000000ULL;
-const Bitboard Rank6BB = 0xFF0000000000ULL;
-const Bitboard Rank7BB = 0xFF000000000000ULL;
-const Bitboard Rank8BB = 0xFF00000000000000ULL;
-
-const Bitboard RankBB[8] = {
-  Rank1BB, Rank2BB, Rank3BB, Rank4BB, Rank5BB, Rank6BB, Rank7BB, Rank8BB
-};
-
-const Bitboard RelativeRankBB[2][8] = {
-  { Rank1BB, Rank2BB, Rank3BB, Rank4BB, Rank5BB, Rank6BB, Rank7BB, Rank8BB },
-  { Rank8BB, Rank7BB, Rank6BB, Rank5BB, Rank4BB, Rank3BB, Rank2BB, Rank1BB }
-};
-
-const Bitboard InFrontBB[2][8] = {
-  { Rank2BB | Rank3BB | Rank4BB | Rank5BB | Rank6BB | Rank7BB | Rank8BB,
-    Rank3BB | Rank4BB | Rank5BB | Rank6BB | Rank7BB | Rank8BB,
-    Rank4BB | Rank5BB | Rank6BB | Rank7BB | Rank8BB,
-    Rank5BB | Rank6BB | Rank7BB | Rank8BB,
-    Rank6BB | Rank7BB | Rank8BB,
-    Rank7BB | Rank8BB,
-    Rank8BB,
-    EmptyBoardBB
-  },
-  { EmptyBoardBB,
-    Rank1BB,
-    Rank2BB | Rank1BB,
-    Rank3BB | Rank2BB | Rank1BB,
-    Rank4BB | Rank3BB | Rank2BB | Rank1BB,
-    Rank5BB | Rank4BB | Rank3BB | Rank2BB | Rank1BB,
-    Rank6BB | Rank5BB | Rank4BB | Rank3BB | Rank2BB | Rank1BB,
-    Rank7BB | Rank6BB | Rank5BB | Rank4BB | Rank3BB | Rank2BB | Rank1BB
 }
-};
 
-extern Bitboard SetMaskBB[65];
+namespace Bitbases {
-extern Bitboard ClearMaskBB[65];
 
-extern Bitboard StepAttackBB[16][64];
+void init_kpk();
-extern Bitboard RayBB[64][8];
+uint32_t probe_kpk(Square wksq, Square wpsq, Square bksq, Color stm);
+
+}
+
+CACHE_LINE_ALIGNMENT
+
+extern Bitboard RMasks[64];
+extern Bitboard RMagics[64];
+extern Bitboard* RAttacks[64];
+extern unsigned RShifts[64];
+
+extern Bitboard BMasks[64];
+extern Bitboard BMagics[64];
+extern Bitboard* BAttacks[64];
+extern unsigned BShifts[64];
+
+extern Bitboard SquareBB[64];
+extern Bitboard FileBB[8];
+extern Bitboard RankBB[8];
+extern Bitboard AdjacentFilesBB[8];
+extern Bitboard ThisAndAdjacentFilesBB[8];
+extern Bitboard InFrontBB[2][8];
+extern Bitboard StepAttacksBB[16][64];
 extern Bitboard BetweenBB[64][64];
-
+extern Bitboard DistanceRingsBB[64][8];
+extern Bitboard ForwardBB[2][64];
 extern Bitboard PassedPawnMask[2][64];
-extern Bitboard OutpostMask[2][64];
+extern Bitboard AttackSpanMask[2][64];
-
+extern Bitboard PseudoAttacks[6][64];
-#if defined(USE_COMPACT_ROOK_ATTACKS)
-
-extern Bitboard RankAttacks[8][64], FileAttacks[8][64];
-
-#else
-
-extern const uint64_t RMult[64];
-extern const int RShift[64];
-extern Bitboard RMask[64];
-extern int RAttackIndex[64];
-extern Bitboard RAttacks[0x19000];
-
-#endif // defined(USE_COMPACT_ROOK_ATTACKS)
-
-extern const uint64_t BMult[64];
-extern const int BShift[64];
-extern Bitboard BMask[64];
-extern int BAttackIndex[64];
-extern Bitboard BAttacks[0x1480];
-
-extern Bitboard BishopPseudoAttacks[64];
-extern Bitboard RookPseudoAttacks[64];
-extern Bitboard QueenPseudoAttacks[64];
 
 
-////
+/// Overloads of bitwise operators between a Bitboard and a Square for testing
-//// Inline functions
+/// whether a given bit is set in a bitboard, and for setting and clearing bits.
-////
 
-/// Functions for testing whether a given bit is set in a bitboard, and for
+inline Bitboard operator&(Bitboard b, Square s) {
-/// setting and clearing bits.
+  return b & SquareBB[s];
-
-inline Bitboard bit_is_set(Bitboard b, Square s) {
-  return b & SetMaskBB[s];
 }
 
-inline void set_bit(Bitboard *b, Square s) {
+inline Bitboard& operator|=(Bitboard& b, Square s) {
-  *b |= SetMaskBB[s];
+  return b |= SquareBB[s];
 }
 
-inline void clear_bit(Bitboard *b, Square s) {
+inline Bitboard& operator^=(Bitboard& b, Square s) {
-  *b &= ClearMaskBB[s];
+  return b ^= SquareBB[s];
+}
+
+inline Bitboard operator|(Bitboard b, Square s) {
+  return b | SquareBB[s];
+}
+
+inline Bitboard operator^(Bitboard b, Square s) {
+  return b ^ SquareBB[s];
 }
 
 
-/// rank_bb() and file_bb() gives a bitboard containing all squares on a given
+/// more_than_one() returns true if in 'b' there is more than one bit set
-/// file or rank.  It is also possible to pass a square as input to these
+
-/// functions.
+inline bool more_than_one(Bitboard b) {
+  return b & (b - 1);
+}
+
+
+/// rank_bb() and file_bb() take a file or a square as input and return
+/// a bitboard representing all squares on the given file or rank.
 
 inline Bitboard rank_bb(Rank r) {
   return RankBB[r];
 }
 
 inline Bitboard rank_bb(Square s) {
-  return rank_bb(square_rank(s));
+  return RankBB[rank_of(s)];
 }
 
 inline Bitboard file_bb(File f) {
@@ -222,43 +111,23 @@ inline Bitboard file_bb(File f) {
 }
 
 inline Bitboard file_bb(Square s) {
-  return file_bb(square_file(s));
+  return FileBB[file_of(s)];
 }
 
 
-/// neighboring_files_bb takes a file or a square as input, and returns a
+/// adjacent_files_bb takes a file as input and returns a bitboard representing
-/// bitboard representing all squares on the neighboring files.
+/// all squares on the adjacent files.
 
-inline Bitboard neighboring_files_bb(File f) {
+inline Bitboard adjacent_files_bb(File f) {
-  return NeighboringFilesBB[f];
+  return AdjacentFilesBB[f];
-}
-
-inline Bitboard neighboring_files_bb(Square s) {
-  return neighboring_files_bb(square_file(s));
 }
 
 
-/// this_and_neighboring_files_bb takes a file or a square as input, and
+/// this_and_adjacent_files_bb takes a file as input and returns a bitboard
-/// returns a bitboard representing all squares on the given and neighboring
+/// representing all squares on the given and adjacent files.
-/// files.
 
-inline Bitboard this_and_neighboring_files_bb(File f) {
+inline Bitboard this_and_adjacent_files_bb(File f) {
-  return ThisAndNeighboringFilesBB[f];
+  return ThisAndAdjacentFilesBB[f];
-}
-
-inline Bitboard this_and_neighboring_files_bb(Square s) {
-  return this_and_neighboring_files_bb(square_file(s));
-}
-
-
-/// relative_rank_bb() takes a color and a rank as input, and returns a bitboard
-/// representing all squares on the given rank from the given color's point of
-/// view. For instance, relative_rank_bb(WHITE, 7) gives all squares on the
-/// 7th rank, while relative_rank_bb(BLACK, 7) gives all squares on the 2nd
-/// rank.
-
-inline Bitboard relative_rank_bb(Color c, Rank r) {
-  return RelativeRankBB[c][r];
 }
 
 
@@ -273,218 +142,139 @@ inline Bitboard in_front_bb(Color c, Rank r) {
 }
 
 inline Bitboard in_front_bb(Color c, Square s) {
-  return in_front_bb(c, square_rank(s));
+  return InFrontBB[c][rank_of(s)];
 }
 
 
-/// behind_bb() takes a color and a rank or square as input, and returns a
+/// between_bb returns a bitboard representing all squares between two squares.
-/// bitboard representing all the squares on all ranks behind of the rank
+/// For instance, between_bb(SQ_C4, SQ_F7) returns a bitboard with the bits for
-/// (or square), from the given color's point of view.
+/// square d5 and e6 set.  If s1 and s2 are not on the same line, file or diagonal,
+/// 0 is returned.
 
-inline Bitboard behind_bb(Color c, Rank r) {
+inline Bitboard between_bb(Square s1, Square s2) {
-  return InFrontBB[opposite_color(c)][r];
-}
-
-inline Bitboard behind_bb(Color c, Square s) {
-  return in_front_bb(opposite_color(c), square_rank(s));
-}
-
-
-/// ray_bb() gives a bitboard representing all squares along the ray in a
-/// given direction from a given square.
-
-inline Bitboard ray_bb(Square s, SignedDirection d) {
-  return RayBB[s][d];
-}
-
-
-/// Functions for computing sliding attack bitboards.  rook_attacks_bb(),
-/// bishop_attacks_bb() and queen_attacks_bb() all take a square and a
-/// bitboard of occupied squares as input, and return a bitboard representing
-/// all squares attacked by a rook, bishop or queen on the given square.
-
-#if defined(USE_COMPACT_ROOK_ATTACKS)
-
-inline Bitboard file_attacks_bb(Square s, Bitboard blockers) {
-  Bitboard b = (blockers >> square_file(s)) & 0x01010101010100ULL;
-  return
-    FileAttacks[square_rank(s)][(b*0xd6e8802041d0c441ULL)>>58] & file_bb(s);
-}
-
-inline Bitboard rank_attacks_bb(Square s, Bitboard blockers) {
-  Bitboard b = (blockers >> ((s & 56) + 1)) & 63;
-  return RankAttacks[square_file(s)][b] & rank_bb(s);
-}
-
-inline Bitboard rook_attacks_bb(Square s, Bitboard blockers) {
-  return file_attacks_bb(s, blockers) | rank_attacks_bb(s, blockers);
-}
-
-#elif defined(USE_32BIT_ATTACKS)
-
-inline Bitboard rook_attacks_bb(Square s, Bitboard blockers) {
-  Bitboard b = blockers & RMask[s];
-  return RAttacks[RAttackIndex[s] +
-                  (unsigned(int(b) * int(RMult[s]) ^
-                            int(b >> 32) * int(RMult[s] >> 32))
-                   >> RShift[s])];
-}
-
-#else
-
-inline Bitboard rook_attacks_bb(Square s, Bitboard blockers) {
-  Bitboard b = blockers & RMask[s];
-  return RAttacks[RAttackIndex[s] + ((b * RMult[s]) >> RShift[s])];
-}
-
-#endif
-
-#if defined(USE_32BIT_ATTACKS)
-
-inline Bitboard bishop_attacks_bb(Square s, Bitboard blockers) {
-  Bitboard b = blockers & BMask[s];
-  return BAttacks[BAttackIndex[s] +
-                  (unsigned(int(b) * int(BMult[s]) ^
-                            int(b >> 32) * int(BMult[s] >> 32))
-                   >> BShift[s])];
-}
-
-#else // defined(USE_32BIT_ATTACKS)
-
-inline Bitboard bishop_attacks_bb(Square s, Bitboard blockers) {
-  Bitboard b = blockers & BMask[s];
-  return BAttacks[BAttackIndex[s] + ((b * BMult[s]) >> BShift[s])];
-}
-
-#endif // defined(USE_32BIT_ATTACKS)
-
-inline Bitboard queen_attacks_bb(Square s, Bitboard blockers) {
-  return rook_attacks_bb(s, blockers) | bishop_attacks_bb(s, blockers);
-}
-
-
-/// squares_between returns a bitboard representing all squares between
-/// two squares.  For instance, squares_between(SQ_C4, SQ_F7) returns a
-/// bitboard with the bits for square d5 and e6 set.  If s1 and s2 are not
-/// on the same line, file or diagonal, EmptyBoardBB is returned.
-
-inline Bitboard squares_between(Square s1, Square s2) {
   return BetweenBB[s1][s2];
 }
 
 
-/// squares_in_front_of takes a color and a square as input, and returns a
+/// forward_bb takes a color and a square as input, and returns a bitboard
-/// bitboard representing all squares along the line in front of the square,
+/// representing all squares along the line in front of the square, from the
-/// from the point of view of the given color.  For instance,
+/// point of view of the given color. Definition of the table is:
-/// squares_in_front_of(BLACK, SQ_E4) returns a bitboard with the squares
+/// ForwardBB[c][s] = in_front_bb(c, s) & file_bb(s)
-/// e3, e2 and e1 set.
 
-inline Bitboard squares_in_front_of(Color c, Square s) {
+inline Bitboard forward_bb(Color c, Square s) {
-  return in_front_bb(c, s) & file_bb(s);
+  return ForwardBB[c][s];
-}
-
-
-/// squares_behind is similar to squares_in_front, but returns the squares
-/// behind the square instead of in front of the square.
-
-inline Bitboard squares_behind(Color c, Square s) {
-  return in_front_bb(opposite_color(c), s) & file_bb(s);
 }
 
 
 /// passed_pawn_mask takes a color and a square as input, and returns a
 /// bitboard mask which can be used to test if a pawn of the given color on
-/// the given square is a passed pawn.
+/// the given square is a passed pawn. Definition of the table is:
+/// PassedPawnMask[c][s] = in_front_bb(c, s) & this_and_adjacent_files_bb(s)
 
 inline Bitboard passed_pawn_mask(Color c, Square s) {
   return PassedPawnMask[c][s];
 }
 
 
-/// outpost_mask takes a color and a square as input, and returns a bitboard
+/// attack_span_mask takes a color and a square as input, and returns a bitboard
-/// mask which can be used to test whether a piece on the square can possibly
+/// representing all squares that can be attacked by a pawn of the given color
-/// be driven away by an enemy pawn.
+/// when it moves along its file starting from the given square. Definition is:
+/// AttackSpanMask[c][s] = in_front_bb(c, s) & adjacent_files_bb(s);
 
-inline Bitboard outpost_mask(Color c, Square s) {
+inline Bitboard attack_span_mask(Color c, Square s) {
-  return OutpostMask[c][s];
+  return AttackSpanMask[c][s];
 }
 
 
-/// isolated_pawn_mask takes a square as input, and returns a bitboard mask
+/// squares_aligned returns true if the squares s1, s2 and s3 are aligned
-/// which can be used to test whether a pawn on the given square is isolated.
+/// either on a straight or on a diagonal line.
 
-inline Bitboard isolated_pawn_mask(Square s) {
+inline bool squares_aligned(Square s1, Square s2, Square s3) {
-  return neighboring_files_bb(s);
+  return  (BetweenBB[s1][s2] | BetweenBB[s1][s3] | BetweenBB[s2][s3])
+        & (     SquareBB[s1] |      SquareBB[s2] |      SquareBB[s3]);
 }
 
 
-/// count_1s() counts the number of nonzero bits in a bitboard.
+/// same_color_squares() returns a bitboard representing all squares with
+/// the same color of the given square.
 
-#if defined(BITCOUNT_LOOP)
+inline Bitboard same_color_squares(Square s) {
-
+  return Bitboard(0xAA55AA55AA55AA55ULL) & s ?  0xAA55AA55AA55AA55ULL
-inline int count_1s(Bitboard b) {
+                                             : ~0xAA55AA55AA55AA55ULL;
-  int r;
-  for(r = 0; b; r++, b &= b - 1);
-  return r;
 }
 
-inline int count_1s_max_15(Bitboard b) {
+
-  return count_1s(b);
+/// Functions for computing sliding attack bitboards. Function attacks_bb() takes
+/// a square and a bitboard of occupied squares as input, and returns a bitboard
+/// representing all squares attacked by Pt (bishop or rook) on the given square.
+template<PieceType Pt>
+FORCE_INLINE unsigned magic_index(Square s, Bitboard occ) {
+
+  Bitboard* const Masks  = Pt == ROOK ? RMasks  : BMasks;
+  Bitboard* const Magics = Pt == ROOK ? RMagics : BMagics;
+  unsigned* const Shifts = Pt == ROOK ? RShifts : BShifts;
+
+  if (Is64Bit)
+      return unsigned(((occ & Masks[s]) * Magics[s]) >> Shifts[s]);
+
+  unsigned lo = unsigned(occ) & unsigned(Masks[s]);
+  unsigned hi = unsigned(occ >> 32) & unsigned(Masks[s] >> 32);
+  return (lo * unsigned(Magics[s]) ^ hi * unsigned(Magics[s] >> 32)) >> Shifts[s];
 }
 
-#elif defined(BITCOUNT_SWAR_32)
+template<PieceType Pt>
-
+inline Bitboard attacks_bb(Square s, Bitboard occ) {
-inline int count_1s(Bitboard b) {
+  return (Pt == ROOK ? RAttacks : BAttacks)[s][magic_index<Pt>(s, occ)];
-  unsigned w = unsigned(b >> 32), v = unsigned(b);
-  v -= (v >> 1) & 0x55555555; // 0-2 in 2 bits
-  w -= (w >> 1) & 0x55555555;
-  v = ((v >> 2) & 0x33333333) + (v & 0x33333333); // 0-4 in 4 bits
-  w = ((w >> 2) & 0x33333333) + (w & 0x33333333);
-  v = ((v >> 4) + v) & 0x0F0F0F0F; // 0-8 in 8 bits
-  v += (((w >> 4) + w) & 0x0F0F0F0F);  // 0-16 in 8 bits
-  v *= 0x01010101; // mul is fast on amd procs
-  return int(v >> 24);
 }
 
-inline int count_1s_max_15(Bitboard b) {
+
-  unsigned w = unsigned(b >> 32), v = unsigned(b);
+/// lsb()/msb() finds the least/most significant bit in a nonzero bitboard.
-  v -= (v >> 1) & 0x55555555; // 0-2 in 2 bits
+/// pop_lsb() finds and clears the least significant bit in a nonzero bitboard.
-  w -= (w >> 1) & 0x55555555;
+
-  v = ((v >> 2) & 0x33333333) + (v & 0x33333333); // 0-4 in 4 bits
+#if defined(USE_BSFQ)
-  w = ((w >> 2) & 0x33333333) + (w & 0x33333333);
+
-  v += w; // 0-8 in 4 bits
+#  if defined(_MSC_VER) && !defined(__INTEL_COMPILER)
-  v *= 0x11111111;
+
-  return int(v >> 28);
+FORCE_INLINE Square lsb(Bitboard b) {
+  unsigned long index;
+  _BitScanForward64(&index, b);
+  return (Square) index;
 }
 
-#elif defined(BITCOUNT_SWAR_64)
+FORCE_INLINE Square msb(Bitboard b) {
-
+  unsigned long index;
-inline int count_1s(Bitboard b) {
+  _BitScanReverse64(&index, b);
-  b -= ((b>>1) & 0x5555555555555555ULL);
+  return (Square) index;
-  b = ((b>>2) & 0x3333333333333333ULL) + (b & 0x3333333333333333ULL);
-  b = ((b>>4) + b) & 0x0F0F0F0F0F0F0F0FULL;
-  b *= 0x0101010101010101ULL;
-  return int(b >> 56);
 }
 
-inline int count_1s_max_15(Bitboard b) {
+#  else
-  b -= (b>>1) & 0x5555555555555555ULL;
+
-  b = ((b>>2) & 0x3333333333333333ULL) + (b & 0x3333333333333333ULL);
+FORCE_INLINE Square lsb(Bitboard b) { // Assembly code by Heinz van Saanen
-  b *= 0x1111111111111111ULL;
+  Bitboard index;
-  return int(b >> 60);
+  __asm__("bsfq %1, %0": "=r"(index): "rm"(b) );
+  return (Square) index;
 }
 
-#endif // BITCOUNT
+FORCE_INLINE Square msb(Bitboard b) {
+  Bitboard index;
+  __asm__("bsrq %1, %0": "=r"(index): "rm"(b) );
+  return (Square) index;
+}
 
+#  endif
 
-////
+FORCE_INLINE Square pop_lsb(Bitboard* b) {
-//// Prototypes
+  const Square s = lsb(*b);
-////
+  *b &= ~(1ULL << s);
+  return s;
+}
 
-extern void print_bitboard(Bitboard b);
+#else // if !defined(USE_BSFQ)
-extern void init_bitboards();
-extern Square first_1(Bitboard b);
-extern Square pop_1st_bit(Bitboard *b);
 
+extern Square msb(Bitboard b);
+extern Square lsb(Bitboard b);
+extern Square pop_lsb(Bitboard* b);
+
+#endif
 
 #endif // !defined(BITBOARD_H_INCLUDED)

src/bitcount.h

@@ -0,0 +1,112 @@
+/*
+  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
+  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
+
+  Stockfish is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+
+  Stockfish is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#if !defined(BITCOUNT_H_INCLUDED)
+#define BITCOUNT_H_INCLUDED
+
+#include <cassert>
+#include "types.h"
+
+enum BitCountType {
+  CNT_64,
+  CNT_64_MAX15,
+  CNT_32,
+  CNT_32_MAX15,
+  CNT_HW_POPCNT
+};
+
+/// Determine at compile time the best popcount<> specialization according if
+/// platform is 32 or 64 bits, to the maximum number of nonzero bits to count or
+/// use hardware popcnt instruction when available.
+const BitCountType Full  = HasPopCnt ? CNT_HW_POPCNT : Is64Bit ? CNT_64 : CNT_32;
+const BitCountType Max15 = HasPopCnt ? CNT_HW_POPCNT : Is64Bit ? CNT_64_MAX15 : CNT_32_MAX15;
+
+
+/// popcount() counts the number of nonzero bits in a bitboard
+template<BitCountType> inline int popcount(Bitboard);
+
+template<>
+inline int popcount<CNT_64>(Bitboard b) {
+  b -= ((b>>1) & 0x5555555555555555ULL);
+  b = ((b>>2) & 0x3333333333333333ULL) + (b & 0x3333333333333333ULL);
+  b = ((b>>4) + b) & 0x0F0F0F0F0F0F0F0FULL;
+  b *= 0x0101010101010101ULL;
+  return int(b >> 56);
+}
+
+template<>
+inline int popcount<CNT_64_MAX15>(Bitboard b) {
+  b -= (b>>1) & 0x5555555555555555ULL;
+  b = ((b>>2) & 0x3333333333333333ULL) + (b & 0x3333333333333333ULL);
+  b *= 0x1111111111111111ULL;
+  return int(b >> 60);
+}
+
+template<>
+inline int popcount<CNT_32>(Bitboard b) {
+  unsigned w = unsigned(b >> 32), v = unsigned(b);
+  v -= (v >> 1) & 0x55555555; // 0-2 in 2 bits
+  w -= (w >> 1) & 0x55555555;
+  v = ((v >> 2) & 0x33333333) + (v & 0x33333333); // 0-4 in 4 bits
+  w = ((w >> 2) & 0x33333333) + (w & 0x33333333);
+  v = ((v >> 4) + v) & 0x0F0F0F0F; // 0-8 in 8 bits
+  v += (((w >> 4) + w) & 0x0F0F0F0F);  // 0-16 in 8 bits
+  v *= 0x01010101; // mul is fast on amd procs
+  return int(v >> 24);
+}
+
+template<>
+inline int popcount<CNT_32_MAX15>(Bitboard b) {
+  unsigned w = unsigned(b >> 32), v = unsigned(b);
+  v -= (v >> 1) & 0x55555555; // 0-2 in 2 bits
+  w -= (w >> 1) & 0x55555555;
+  v = ((v >> 2) & 0x33333333) + (v & 0x33333333); // 0-4 in 4 bits
+  w = ((w >> 2) & 0x33333333) + (w & 0x33333333);
+  v += w; // 0-8 in 4 bits
+  v *= 0x11111111;
+  return int(v >> 28);
+}
+
+template<>
+inline int popcount<CNT_HW_POPCNT>(Bitboard b) {
+
+#if !defined(USE_POPCNT)
+
+  assert(false);
+  return b != 0; // Avoid 'b not used' warning
+
+#elif defined(_MSC_VER) && defined(__INTEL_COMPILER)
+
+  return _mm_popcnt_u64(b);
+
+#elif defined(_MSC_VER)
+
+  return (int)__popcnt64(b);
+
+#else
+
+  unsigned long ret;
+  __asm__("popcnt %1, %0" : "=r" (ret) : "r" (b));
+  return ret;
+
+#endif
+}
+
+#endif // !defined(BITCOUNT_H_INCLUDED)

src/book.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,41 +17,36 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 /*
   The code in this file is based on the opening book code in PolyGlot
   by Fabien Letouzey. PolyGlot is available under the GNU General
   Public License, and can be downloaded from http://wbec-ridderkerk.nl
 */
 
-
+#include <algorithm>
-////
-//// Includes
-////
-
 #include <cassert>
+#include <iostream>
 
 #include "book.h"
-#include "mersenne.h"
+#include "misc.h"
 #include "movegen.h"
 
-
+using namespace std;
-////
-//// Global variables
-////
-
-Book OpeningBook;
-
-
-////
-//// Local definitions
-////
 
 namespace {
 
-  /// Random numbers from PolyGlot, used to compute book hash keys.
+  // A Polyglot book is a series of "entries" of 16 bytes. All integers are
+  // stored in big-endian format, with highest byte first (regardless of size).
+  // The entries are ordered according to the key in ascending order.
+  struct BookEntry {
+    uint64_t key;
+    uint16_t move;
+    uint16_t count;
+    uint32_t learn;
+  };
 
-  const uint64_t Random64[781] = {
+  // Random numbers from PolyGlot, used to compute book hash keys
+  const Key PolyGlotRandoms[781] = {
     0x9D39247E33776D41ULL, 0x2AF7398005AAA5C7ULL, 0x44DB015024623547ULL,
     0x9C15F73E62A76AE2ULL, 0x75834465489C0C89ULL, 0x3290AC3A203001BFULL,
     0x0FBBAD1F61042279ULL, 0xE83A908FF2FB60CAULL, 0x0D7E765D58755C10ULL,
@@ -315,278 +310,172 @@ namespace {
     0xF8D626AAAF278509ULL
   };
 
+  // Offsets to the PolyGlotRandoms[] array of zobrist keys
+  const Key* ZobPiece     = PolyGlotRandoms;
+  const Key* ZobCastle    = ZobPiece     + 12 * 64; // Pieces * squares
+  const Key* ZobEnPassant = ZobCastle    + 4;       // Castle flags
+  const Key* ZobTurn      = ZobEnPassant + 8;       // Number of files
 
-  /// Indices to the Random64[] array
+  // book_key() returns the PolyGlot hash key of the given position
+  uint64_t book_key(const Position& pos) {
 
-  const int RandomPiece = 0;
+    uint64_t key = 0;
-  const int RandomCastle = 768;
+    Bitboard b = pos.pieces();
-  const int RandomEnPassant = 772;
-  const int RandomTurn = 780;
 
-
+    while (b)
-  /// Convert pieces to the range 0..1
-
-  const int PieceTo12[] = {
-    0, 0, 2, 4, 6, 8, 10, 0, 0, 1, 3, 5, 7, 9, 11
-  };
-
-
-  /// Prototypes
-
-  uint64_t book_key(const Position &pos);
-  uint64_t book_piece_key(Piece p, Square s);
-  uint64_t book_castle_key(const Position &pos);
-  uint64_t book_ep_key(const Position &pos);
-  uint64_t book_color_key(const Position &pos);
-
-  uint16_t read_integer16(std::ifstream& file);
-  uint64_t read_integer64(std::ifstream& file);
-  uint64_t read_integer(std::ifstream& file, int size);
-}
-
-
-////
-//// Functions
-////
-
-
-/// Constructor
-
-Book::Book() : bookSize(0) {}
-
-
-/// Book::open() opens a book file with a given file name.
-
-void Book::open(const std::string &fName) {
-
-  fileName = fName;
-  bookFile.open(fileName.c_str(), std::ifstream::in | std::ifstream::binary);
-  if (!bookFile.is_open())
-      return;
-
-  bookFile.seekg(0, std::ios::end);
-  bookSize = bookFile.tellg() / 16;
-  bookFile.seekg(0, std::ios::beg);
-
-  if (!bookFile.good())
     {
-      std::cerr << "Failed to open book file " << fileName << std::endl;
+        // In PolyGlotRandoms[] pieces are stored in the following sequence:
-      exit(EXIT_FAILURE);
+        // BP = 0, WP = 1, BN = 2, WN = 3, ... BK = 10, WK = 11
+        Square s = pop_lsb(&b);
+        Piece p = pos.piece_on(s);
+        int pieceOfs = 2 * (type_of(p) - 1) + (color_of(p) == WHITE);
+        key ^= ZobPiece[64 * pieceOfs + s];
     }
+
+    b = pos.can_castle(ALL_CASTLES);
+
+    while (b)
+        key ^= ZobCastle[pop_lsb(&b)];
+
+    if (pos.ep_square() != SQ_NONE)
+        key ^= ZobEnPassant[file_of(pos.ep_square())];
+
+    if (pos.side_to_move() == WHITE)
+        key ^= ZobTurn[0];
+
+    return key;
+  }
+
+} // namespace
+
+PolyglotBook::PolyglotBook() {
+
+  for (int i = Time::now() % 10000; i > 0; i--)
+      RKiss.rand<unsigned>(); // Make random number generation less deterministic
+}
+
+PolyglotBook::~PolyglotBook() { if (is_open()) close(); }
+
+
+/// operator>>() reads sizeof(T) chars from the file's binary byte stream and
+/// converts them in a number of type T. A Polyglot book stores numbers in
+/// big-endian format.
+
+template<typename T> PolyglotBook& PolyglotBook::operator>>(T& n) {
+
+  n = 0;
+  for (size_t i = 0; i < sizeof(T); i++)
+      n = T((n << 8) + ifstream::get());
+
+  return *this;
+}
+
+template<> PolyglotBook& PolyglotBook::operator>>(BookEntry& e) {
+  return *this >> e.key >> e.move >> e.count >> e.learn;
 }
 
 
-/// Book::close() closes the currently open book file.
+/// open() tries to open a book file with the given name after closing any
+/// exsisting one.
 
-void Book::close() {
+bool PolyglotBook::open(const char* fName) {
 
-  if (bookFile.is_open())
+  if (is_open()) // Cannot close an already closed file
-      bookFile.close();
+      close();
+
+  ifstream::open(fName, ifstream::in | ifstream::binary);
+
+  fileName = is_open() ? fName : "";
+  ifstream::clear(); // Reset any error flag to allow retry ifstream::open()
+  return !fileName.empty();
 }
 
 
-/// Book::is_open() tests whether a book file has been opened.
+/// probe() tries to find a book move for the given position. If no move is
+/// found returns MOVE_NONE. If pickBest is true returns always the highest
+/// rated move, otherwise randomly chooses one, based on the move score.
 
-bool Book::is_open() const {
+Move PolyglotBook::probe(const Position& pos, const string& fName, bool pickBest) {
 
-  return bookFile.is_open() && bookSize != 0;
+  if (fileName != fName && !open(fName.c_str()))
-}
+      return MOVE_NONE;
 
-
+  BookEntry e;
-/// Book::file_name() returns the file name of the currently active book,
+  uint16_t best = 0;
-/// or the empty string if no book is open.
+  unsigned sum = 0;
-
+  Move move = MOVE_NONE;
-const std::string Book::file_name() const {
-
-  return bookFile.is_open() ? fileName : "";
-}
-
-
-/// Book::get_move() gets a book move for a given position.  Returns
-/// MOVE_NONE if no book move is found.
-
-Move Book::get_move(const Position &pos) const {
-  if(this->is_open()) {
-    int bestMove = 0, bestScore = 0, move, score;
   uint64_t key = book_key(pos);
-    BookEntry entry;
 
-    for(int i = this->find_key(key); i < bookSize; i++) {
+  seekg(find_first(key) * sizeof(BookEntry), ios_base::beg);
-      this->read_entry(entry, i);
-      if(entry.key != key)
-        break;
-      move = entry.move;
-      score = entry.count;
-      assert(score > 0);
 
-      bestScore += score;
+  while (*this >> e, e.key == key && good())
-      if(int(genrand_int32() % bestScore) < score)
+  {
-        bestMove = move;
+      best = max(best, e.count);
+      sum += e.count;
+
+      // Choose book move according to its score. If a move has a very
+      // high score it has higher probability to be choosen than a move
+      // with lower score. Note that first entry is always chosen.
+      if (   (sum && RKiss.rand<unsigned>() % sum < e.count)
+          || (pickBest && e.count == best))
+          move = Move(e.move);
   }
 
-    if(bestMove != 0) {
+  if (!move)
-      MoveStack moves[256];
+      return MOVE_NONE;
-      int n, j;
+
-      n = generate_legal_moves(pos, moves);
+  // A PolyGlot book move is encoded as follows:
-      for(j = 0; j < n; j++)
+  //
-        if((int(moves[j].move) & 07777) == bestMove)
+  // bit  0- 5: destination square (from 0 to 63)
-          return moves[j].move;
+  // bit  6-11: origin square (from 0 to 63)
-    }
+  // bit 12-14: promotion piece (from KNIGHT == 1 to QUEEN == 4)
-  }
+  //
+  // Castling moves follow "king captures rook" representation. So in case book
+  // move is a promotion we have to convert to our representation, in all the
+  // other cases we can directly compare with a Move after having masked out
+  // the special Move's flags (bit 14-15) that are not supported by PolyGlot.
+  int pt = (move >> 12) & 7;
+  if (pt)
+      move = make<PROMOTION>(from_sq(move), to_sq(move), PieceType(pt + 1));
+
+  // Add 'special move' flags and verify it is legal
+  for (MoveList<LEGAL> ml(pos); !ml.end(); ++ml)
+      if (move == (ml.move() & 0x3FFF))
+          return ml.move();
+
   return MOVE_NONE;
 }
 
 
-/// Book::find_key() takes a book key as input, and does a binary search
+/// find_first() takes a book key as input, and does a binary search through
-/// through the book file for the given key.  The index to the first book
+/// the book file for the given key. Returns the index of the leftmost book
-/// entry with the same key as the input is returned.  When the key is not
+/// entry with the same key as the input.
-/// found in the book file, bookSize is returned.
 
-int Book::find_key(uint64_t key) const {
+size_t PolyglotBook::find_first(uint64_t key) {
-  int left, right, mid;
-  BookEntry entry;
 
-  // Binary search (finds the leftmost entry)
+  seekg(0, ios::end); // Move pointer to end, so tellg() gets file's size
-  left = 0;
-  right = bookSize - 1;
 
-  assert(left <= right);
+  size_t low = 0, mid, high = (size_t)tellg() / sizeof(BookEntry) - 1;
+  BookEntry e;
 
-  while(left < right) {
+  assert(low <= high);
-    mid = (left + right) / 2;
-    assert(mid >= left && mid < right);
 
-    this->read_entry(entry, mid);
+  while (low < high && good())
+  {
+      mid = (low + high) / 2;
 
-    if(key <= entry.key)
+      assert(mid >= low && mid < high);
-      right = mid;
+
+      seekg(mid * sizeof(BookEntry), ios_base::beg);
+      *this >> e;
+
+      if (key <= e.key)
+          high = mid;
       else
-      left = mid + 1;
+          low = mid + 1;
   }
 
-  assert(left == right);
+  assert(low == high);
 
-  this->read_entry(entry, left);
+  return low;
-
-  return (entry.key == key)? left : bookSize;
-}
-
-
-/// Book::read_entry() takes a BookEntry reference and an integer index as
-/// input, and looks up the opening book entry at the given index in the book
-/// file.  The book entry is copied to the first input parameter.
-
-void Book::read_entry(BookEntry& entry, int n) const {
-
-  assert(n >= 0 && n < bookSize);
-  assert(bookFile.is_open());
-
-  bookFile.seekg(n*16, std::ios_base::beg);
-  if (!bookFile.good())
-  {
-    std::cerr << "Failed to read book entry at index " << n << std::endl;
-    exit(EXIT_FAILURE);
-  }
-  entry.key = read_integer64(bookFile);
-  entry.move = read_integer16(bookFile);
-  entry.count = read_integer16(bookFile);
-  entry.n = read_integer16(bookFile);
-  entry.sum = read_integer16(bookFile);
-}
-
-
-////
-//// Local definitions
-////
-
-namespace {
-
-  uint64_t book_key(const Position &pos) {
-    uint64_t result = 0ULL;
-
-    for(Color c = WHITE; c <= BLACK; c++) {
-      Bitboard b = pos.pieces_of_color(c);
-      Square s;
-      Piece p;
-      while(b != EmptyBoardBB) {
-        s = pop_1st_bit(&b);
-        p = pos.piece_on(s);
-        assert(piece_is_ok(p));
-        assert(color_of_piece(p) == c);
-
-        result ^= book_piece_key(p, s);
-      }
-    }
-
-    result ^= book_castle_key(pos);
-    result ^= book_ep_key(pos);
-    result ^= book_color_key(pos);
-
-    return result;
-  }
-
-
-  uint64_t book_piece_key(Piece p, Square s) {
-    return Random64[RandomPiece + (PieceTo12[int(p)]^1)*64 + int(s)];
-  }
-
-
-  uint64_t book_castle_key(const Position &pos) {
-    uint64_t result = 0ULL;
-
-    if(pos.can_castle_kingside(WHITE))
-      result ^= Random64[RandomCastle+0];
-    if(pos.can_castle_queenside(WHITE))
-      result ^= Random64[RandomCastle+1];
-    if(pos.can_castle_kingside(BLACK))
-      result ^= Random64[RandomCastle+2];
-    if(pos.can_castle_queenside(BLACK))
-      result ^= Random64[RandomCastle+3];
-    return result;
-  }
-
-
-  uint64_t book_ep_key(const Position &pos) {
-    return (pos.ep_square() == SQ_NONE)?
-      0ULL : Random64[RandomEnPassant + square_file(pos.ep_square())];
-  }
-
-
-  uint64_t book_color_key(const Position &pos) {
-    return (pos.side_to_move() == WHITE)? Random64[RandomTurn] : 0ULL;
-  }
-
-
-  uint16_t read_integer16(std::ifstream& file) {
-
-    uint64_t n = read_integer(file, 2);
-    assert(n == (uint16_t)n);
-    return (uint16_t)n;
-  }
-
-
-  uint64_t read_integer64(std::ifstream& file) {
-
-    return read_integer(file, 8);
-  }
-
-
-  uint64_t read_integer(std::ifstream& file, int size) {
-
-    char buf[8];
-    file.read(buf, size);
-
-    if (!file.good())
-    {
-        std::cerr << "Failed to read " << size << " bytes from book file"
-                  << std::endl;
-        exit(EXIT_FAILURE);
-    }
-    // Numbers are stored in little endian format
-    uint64_t n = 0ULL;
-    for (int i = 0; i < size; i++)
-        n = (n << 8) + (unsigned char)buf[i];
-
-    return n;
-  }
 }

src/book.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,75 +17,29 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-/*
-  The code in this file is based on the opening book code in PolyGlot
-  by Fabien Letouzey.  PolyGlot is available under the GNU General
-  Public License, and can be downloaded from http://wbec-ridderkerk.nl
-*/
-
-
 #if !defined(BOOK_H_INCLUDED)
 #define BOOK_H_INCLUDED
 
-
-////
-//// Includes
-////
-
 #include <fstream>
 #include <string>
 
-#include "move.h"
 #include "position.h"
+#include "rkiss.h"
 
-
+class PolyglotBook : private std::ifstream {
-////
-//// Types
-////
-
-struct BookEntry {
-  uint64_t key;
-  uint16_t move;
-  uint16_t count;
-  uint16_t n;
-  uint16_t sum;
-};
-
-class Book {
-
 public:
-  // Constructors
+  PolyglotBook();
-  Book();
+ ~PolyglotBook();
-
+  Move probe(const Position& pos, const std::string& fName, bool pickBest);
-  // Open and close book files
-  void open(const std::string &fName);
-  void close();
-
-  // Testing if a book is opened
-  bool is_open() const;
-
-  // The file name of the currently active book
-  const std::string file_name() const;
-
-  // Get a book move for a given position
-  Move get_move(const Position &pos) const;
 
 private:
-  int find_key(uint64_t key) const;
+  template<typename T> PolyglotBook& operator>>(T& n);
-  void read_entry(BookEntry &entry, int n) const;
 
+  bool open(const char* fName);
+  size_t find_first(uint64_t key);
+
+  RKISS RKiss;
   std::string fileName;
-  mutable std::ifstream bookFile;
-  int bookSize;
 };
 
-
-////
-//// Global variables
-////
-
-extern Book OpeningBook;
-
-
 #endif // !defined(BOOK_H_INCLUDED)

src/color.h

@@ -1,51 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(COLOR_H_INCLUDED)
-#define COLOR_H_INCLUDED
-
-
-////
-//// Types
-////
-
-enum Color {
-  WHITE,
-  BLACK,
-  COLOR_NONE
-};
-
-
-////
-//// Inline functions
-////
-
-inline Color operator+ (Color c, int i) { return Color(int(c) + i); }
-inline void operator++ (Color &c, int) { c = Color(int(c) + 1); }
-
-inline Color opposite_color(Color c) {
-  return Color(int(c) ^ 1);
-}
-
-inline bool color_is_ok(Color c) {
-  return c == WHITE || c == BLACK;
-}
-
-#endif // !defined(COLOR_H_INCLUDED)

src/depth.h

@@ -1,62 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(DEPTH_H_INCLUDED)
-#define DEPTH_H_INCLUDED
-
-////
-//// Types
-////
-
-enum Depth {
-  DEPTH_ZERO = 0,
-  DEPTH_MAX = 200  // 100 * OnePly;
-};
-
-
-////
-//// Constants
-////
-
-/// Note: If OnePly is changed, the constant HistoryMax in history.h should
-/// probably also be changed.
-
-const Depth OnePly = Depth(2);
-
-
-////
-//// Inline functions
-////
-
-inline Depth operator+ (Depth d, int i) { return Depth(int(d) + i); }
-inline Depth operator+ (Depth d1, Depth d2) { return Depth(int(d1) + int(d2)); }
-inline void operator+= (Depth &d, int i) { d = Depth(int(d) + i); }
-inline void operator+= (Depth &d1, Depth d2) { d1 += int(d2); }
-inline Depth operator- (Depth d, int i) { return Depth(int(d) - i); }
-inline Depth operator- (Depth d1, Depth d2) { return Depth(int(d1) - int(d2)); }
-inline void operator-= (Depth & d, int i) { d = Depth(int(d) - i); }
-inline Depth operator* (Depth d, int i) { return Depth(int(d) * i); }
-inline Depth operator* (int i, Depth d) { return Depth(int(d) * i); }
-inline void operator*= (Depth &d, int i) { d = Depth(int(d) * i); }
-inline Depth operator/ (Depth d, int i) { return Depth(int(d) / i); }
-inline void operator/= (Depth &d, int i) { d = Depth(int(d) / i); }
-
-
-#endif // !defined(DEPTH_H_INCLUDED)

src/direction.cpp

@@ -1,63 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-////
-//// Includes
-////
-
-#include "direction.h"
-#include "square.h"
-
-
-////
-//// Variables
-////
-
-uint8_t DirectionTable[64][64];
-uint8_t SignedDirectionTable[64][64];
-
-
-////
-//// Functions
-////
-
-void init_direction_table() {
-  SquareDelta deltas[8] = {
-    DELTA_E, DELTA_W, DELTA_N, DELTA_S, DELTA_NE, DELTA_SW, DELTA_NW, DELTA_SE
-  };
-  for(Square s1 = SQ_A1; s1 <= SQ_H8; s1++)
-    for(Square s2 = SQ_A1; s2 <= SQ_H8; s2++) {
-      DirectionTable[s1][s2] = uint8_t(DIR_NONE);
-      SignedDirectionTable[s1][s2] = uint8_t(SIGNED_DIR_NONE);
-      if(s1 == s2) continue;
-      for(SignedDirection d = SIGNED_DIR_E; d <= SIGNED_DIR_SE; d++) {
-        SquareDelta delta = deltas[d];
-        Square s3, s4;
-        for(s4 = s1 + delta, s3 = s1;
-            square_distance(s4, s3) == 1 && s4 != s2 && square_is_ok(s4);
-            s3 = s4, s4 += delta);
-        if(s4 == s2 && square_distance(s4, s3) == 1) {
-          SignedDirectionTable[s1][s2] = uint8_t(d);
-          DirectionTable[s1][s2] = uint8_t(d/2);
-          break;
-        }
-      }
-    }
-}

src/direction.h

@@ -1,92 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(DIRECTION_H_INCLUDED)
-#define DIRECTION_H_INCLUDED
-
-////
-//// Includes
-////
-
-#include "square.h"
-#include "types.h"
-
-
-////
-//// Types
-////
-
-enum Direction {
-  DIR_E = 0, DIR_N = 1, DIR_NE = 2, DIR_NW = 3, DIR_NONE = 4
-};
-
-enum SignedDirection {
-  SIGNED_DIR_E  = 0, SIGNED_DIR_W  = 1,
-  SIGNED_DIR_N  = 2, SIGNED_DIR_S  = 3,
-  SIGNED_DIR_NE = 4, SIGNED_DIR_SW = 5,
-  SIGNED_DIR_NW = 6, SIGNED_DIR_SE = 7,
-  SIGNED_DIR_NONE = 8
-};
-
-
-////
-//// Variables
-////
-
-extern uint8_t DirectionTable[64][64];
-extern uint8_t SignedDirectionTable[64][64];
-
-
-////
-//// Inline functions
-////
-
-inline void operator++ (Direction& d, int) {
-  d = Direction(int(d) + 1);
-}
-
-inline void operator++ (SignedDirection& d, int) {
-  d = SignedDirection(int(d) + 1);
-}
-
-inline Direction direction_between_squares(Square s1, Square s2) {
-  return Direction(DirectionTable[s1][s2]);
-}
-
-inline SignedDirection signed_direction_between_squares(Square s1, Square s2) {
-  return SignedDirection(SignedDirectionTable[s1][s2]);
-}
-
-inline int direction_is_diagonal(Square s1, Square s2) {
-  return DirectionTable[s1][s2] & 2;
-}
-
-inline bool direction_is_straight(Square s1, Square s2) {
-  return DirectionTable[s1][s2] < 2;
-}
-
-////
-//// Prototypes
-////
-
-extern void init_direction_table();
-
-
-#endif // !defined(DIRECTION_H_INCLUDED)

src/endgame.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,26 +17,22 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(ENDGAME_H_INCLUDED)
 #define ENDGAME_H_INCLUDED
 
-////
+#include <map>
-//// Includes
+#include <string>
-////
 
 #include "position.h"
-#include "scale.h"
+#include "types.h"
-#include "value.h"
 
 
-////
+/// EndgameType lists all supported endgames
-//// Types
-////
 
 enum EndgameType {
 
   // Evaluation functions
+
   KXK,   // Generic "mate lone king" eval
   KBNK,  // KBN vs K
   KPK,   // KP vs K
@@ -45,11 +41,15 @@ enum EndgameType {
   KRKN,  // KR vs KN
   KQKR,  // KQ vs KR
   KBBKN, // KBB vs KN
+  KNNK,  // KNN vs K
   KmmKm, // K and two minors vs K and one or two minors
 
+
   // Scaling functions
-    KBPK,    // KBP vs K
+  SCALE_FUNS,
-    KQKRP,   // KQ vs KRP
+
+  KBPsK,   // KB+pawns vs K
+  KQKRPs,  // KQ vs KR+pawns
   KRPKR,   // KRP vs KR
   KRPPKRP, // KRPP vs KRP
   KPsK,    // King and pawns vs king
@@ -60,68 +60,61 @@ enum EndgameType {
   KPKP     // KP vs KP
 };
 
-/// Template abstract base class for all special endgame functions
+
+/// Endgame functions can be of two types according if return a Value or a
+/// ScaleFactor. Type eg_fun<int>::type equals to either ScaleFactor or Value
+/// depending if the template parameter is 0 or 1.
+
+template<int> struct eg_fun { typedef Value type; };
+template<> struct eg_fun<1> { typedef ScaleFactor type; };
+
+
+/// Base and derived templates for endgame evaluation and scaling functions
 
 template<typename T>
-class EndgameFunctionBase {
+struct EndgameBase {
-public:
-  EndgameFunctionBase(Color c) : strongerSide(c) { weakerSide = opposite_color(strongerSide); }
-  virtual ~EndgameFunctionBase() {}
-  virtual T apply(const Position&) = 0;
 
-protected:
+  virtual ~EndgameBase() {}
+  virtual Color color() const = 0;
+  virtual T operator()(const Position&) const = 0;
+};
+
+
+template<EndgameType E, typename T = typename eg_fun<(E > SCALE_FUNS)>::type>
+struct Endgame : public EndgameBase<T> {
+
+  explicit Endgame(Color c) : strongerSide(c), weakerSide(~c) {}
+  Color color() const { return strongerSide; }
+  T operator()(const Position&) const;
+
+private:
   Color strongerSide, weakerSide;
 };
 
-typedef EndgameFunctionBase<Value> EndgameEvaluationFunctionBase;
-typedef EndgameFunctionBase<ScaleFactor> EndgameScalingFunctionBase;
 
+/// Endgames class stores in two std::map the pointers to endgame evaluation
+/// and scaling base objects. Then we use polymorphism to invoke the actual
+/// endgame function calling its operator() that is virtual.
 
-/// Templates subclass for various concrete endgames
+class Endgames {
 
-template<EndgameType>
+  typedef std::map<Key, EndgameBase<eg_fun<0>::type>*> M1;
-struct EvaluationFunction : public EndgameEvaluationFunctionBase {
+  typedef std::map<Key, EndgameBase<eg_fun<1>::type>*> M2;
-  explicit EvaluationFunction(Color c): EndgameEvaluationFunctionBase(c) {}
+
-  Value apply(const Position&);
+  M1 m1;
+  M2 m2;
+
+  M1& map(M1::mapped_type) { return m1; }
+  M2& map(M2::mapped_type) { return m2; }
+
+  template<EndgameType E> void add(const std::string& code);
+
+public:
+  Endgames();
+  ~Endgames();
+
+  template<typename T> T probe(Key key, T& eg)
+  { return eg = map(eg).count(key) ? map(eg)[key] : NULL; }
 };
 
-template<EndgameType>
-struct ScalingFunction : public EndgameScalingFunctionBase {
-  explicit ScalingFunction(Color c) : EndgameScalingFunctionBase(c) {}
-  ScaleFactor apply(const Position&);
-};
-
-
-////
-//// Constants and variables
-////
-
-extern EvaluationFunction<KXK> EvaluateKXK, EvaluateKKX;       // Generic "mate lone king" eval
-extern EvaluationFunction<KBNK> EvaluateKBNK, EvaluateKKBN;    // KBN vs K
-extern EvaluationFunction<KPK> EvaluateKPK, EvaluateKKP;       // KP vs K
-extern EvaluationFunction<KRKP> EvaluateKRKP, EvaluateKPKR;    // KR vs KP
-extern EvaluationFunction<KRKB> EvaluateKRKB, EvaluateKBKR;    // KR vs KB
-extern EvaluationFunction<KRKN> EvaluateKRKN, EvaluateKNKR;    // KR vs KN
-extern EvaluationFunction<KQKR> EvaluateKQKR, EvaluateKRKQ;    // KQ vs KR
-extern EvaluationFunction<KBBKN> EvaluateKBBKN, EvaluateKNKBB; // KBB vs KN
-extern EvaluationFunction<KmmKm> EvaluateKmmKm; // K and two minors vs K and one or two minors:
-
-extern ScalingFunction<KBPK> ScaleKBPK, ScaleKKBP;    // KBP vs K
-extern ScalingFunction<KQKRP> ScaleKQKRP, ScaleKRPKQ; // KQ vs KRP
-extern ScalingFunction<KRPKR> ScaleKRPKR, ScaleKRKRP; // KRP vs KR
-extern ScalingFunction<KRPPKRP> ScaleKRPPKRP, ScaleKRPKRPP; // KRPP vs KRP
-extern ScalingFunction<KPsK> ScaleKPsK, ScaleKKPs;    // King and pawns vs king
-extern ScalingFunction<KBPKB> ScaleKBPKB, ScaleKBKBP; // KBP vs KB
-extern ScalingFunction<KBPPKB> ScaleKBPPKB, ScaleKBKBPP; // KBPP vs KB
-extern ScalingFunction<KBPKN> ScaleKBPKN, ScaleKNKBP; // KBP vs KN
-extern ScalingFunction<KNPK> ScaleKNPK, ScaleKKNP;    // KNP vs K
-extern ScalingFunction<KPKP> ScaleKPKPw, ScaleKPKPb;  // KP vs KP
-
-////
-//// Prototypes
-////
-
-extern void init_bitbases();
-
-
 #endif // !defined(ENDGAME_H_INCLUDED)

src/evaluate.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,95 +17,21 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(EVALUATE_H_INCLUDED)
 #define EVALUATE_H_INCLUDED
 
-////
+#include "types.h"
-//// Includes
-////
 
-#include "material.h"
-#include "pawns.h"
-
-
-////
-//// Types
-////
-
-
-/// The EvalInfo struct contains various information computed and collected
-/// by the evaluation function. An EvalInfo object is passed as one of the
-/// arguments to the evaluation function, and the search can make use of its
-/// contents to make intelligent search decisions.
-///
-/// At the moment, this is not utilized very much:  The only part of the
-/// EvalInfo object which is used by the search is futilityMargin.
 class Position;
 
-struct EvalInfo {
+namespace Eval {
 
-  // Middle game and endgame evaluations
+extern Color RootColor;
-  Value mgValue, egValue;
 
-  // Pointers to material and pawn hash table entries
+extern void init();
-  MaterialInfo* mi;
+extern Value evaluate(const Position& pos, Value& margin);
-  PawnInfo* pi;
+extern std::string trace(const Position& pos);
-
-  // attackedBy[color][piece type] is a bitboard representing all squares
-  // attacked by a given color and piece type.  attackedBy[color][0] contains
-  // all squares attacked by the given color.
-  Bitboard attackedBy[2][8];
-  Bitboard attacked_by(Color c) const { return attackedBy[c][0]; }
-  Bitboard attacked_by(Color c, PieceType pt) const { return attackedBy[c][pt]; }
-
-  // kingZone[color] is the zone around the enemy king which is considered
-  // by the king safety evaluation.  This consists of the squares directly
-  // adjacent to the king, and the three (or two, for a king on an edge file)
-  // squares two ranks in front of the king.  For instance, if black's king
-  // is on g8, kingZone[WHITE] is a bitboard containing the squares f8, h8,
-  // f7, g7, h7, f6, g6 and h6.
-  Bitboard kingZone[2];
-
-  // kingAttackersCount[color] is the number of pieces of the given color
-  // which attack a square in the kingZone of the enemy king.
-  int kingAttackersCount[2];
-
-  // kingAttackersWeight[color] is the sum of the "weight" of the pieces of the
-  // given color which attack a square in the kingZone of the enemy king. The
-  // weights of the individual piece types are given by the variables
-  // QueenAttackWeight, RookAttackWeight, BishopAttackWeight and
-  // KnightAttackWeight in evaluate.cpp
-  int kingAttackersWeight[2];
-
-  // kingAdjacentZoneAttacksCount[color] is the number of attacks to squares
-  // directly adjacent to the king of the given color. Pieces which attack
-  // more than one square are counted multiple times. For instance, if black's
-  // king is on g8 and there's a white knight on g5, this knight adds
-  // 2 to kingAdjacentZoneAttacksCount[BLACK].
-  int kingAdjacentZoneAttacksCount[2];
-
-  // mateThreat[color] is a move for the given side which gives a direct mate.
-  Move mateThreat[2];
-
-  // Middle game and endgame mobility scores.
-  Value mgMobility, egMobility;
-
-  // Extra futility margin.  This is added to the standard futility margin
-  // in the quiescence search.
-  Value futilityMargin;
-};
-
-
-////
-//// Prototypes
-////
-
-extern Value evaluate(const Position& pos, EvalInfo& ei, int threadID);
-extern Value quick_evaluate(const Position& pos);
-extern void init_eval(int threads);
-extern void quit_eval();
-extern void read_weights(Color sideToMove);
 
+}
 
 #endif // !defined(EVALUATE_H_INCLUDED)

src/history.cpp

@@ -1,102 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-////
-//// Includes
-////
-
-#include <cassert>
-#include <cstring>
-
-#include "history.h"
-
-
-////
-//// Functions
-////
-
-/// Constructor
-
-History::History() {
-  this->clear();
-}
-
-
-/// History::clear() clears the history tables.
-
-void History::clear() {
-  memset(history, 0, 2 * 8 * 64 * sizeof(int));
-  memset(successCount, 0, 2 * 8 * 64 * sizeof(int));
-  memset(failureCount, 0, 2 * 8 * 64 * sizeof(int));
-}
-
-
-/// History::success() registers a move as being successful.  This is done
-/// whenever a non-capturing move causes a beta cutoff in the main search.
-/// The three parameters are the moving piece, the move itself, and the
-/// search depth.
-
-void History::success(Piece p, Move m, Depth d) {
-  assert(piece_is_ok(p));
-  assert(move_is_ok(m));
-
-  history[p][move_to(m)] += int(d) * int(d);
-  successCount[p][move_to(m)]++;
-
-  // Prevent history overflow:
-  if(history[p][move_to(m)] >= HistoryMax)
-    for(int i = 0; i < 16; i++)
-      for(int j = 0; j < 64; j++)
-        history[i][j] /= 2;
-}
-
-
-/// History::failure() registers a move as being unsuccessful.  The function is
-/// called for each non-capturing move which failed to produce a beta cutoff
-/// at a node where a beta cutoff was finally found.
-
-void History::failure(Piece p, Move m) {
-  assert(piece_is_ok(p));
-  assert(move_is_ok(m));
-
-  failureCount[p][move_to(m)]++;
-}
-
-
-/// History::move_ordering_score() returns an integer value used to order the
-/// non-capturing moves in the MovePicker class.
-
-int History::move_ordering_score(Piece p, Move m) const {
-  assert(piece_is_ok(p));
-  assert(move_is_ok(m));
-
-  return history[p][move_to(m)];
-}
-
-
-/// History::ok_to_prune() decides whether a move has been sufficiently
-/// unsuccessful that it makes sense to prune it entirely.
-
-bool History::ok_to_prune(Piece p, Move m, Depth d) const {
-  assert(piece_is_ok(p));
-  assert(move_is_ok(m));
-
-  return (int(d) * successCount[p][move_to(m)] < failureCount[p][move_to(m)]);
-}

src/history.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,61 +17,56 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(HISTORY_H_INCLUDED)
 #define HISTORY_H_INCLUDED
 
-////
+#include <algorithm>
-//// Includes
+#include <cstring>
-////
 
-#include "depth.h"
+#include "types.h"
-#include "move.h"
-#include "piece.h"
 
-
+/// The History class stores statistics about how often different moves
-////
+/// have been successful or unsuccessful during the current search. These
-//// Types
+/// statistics are used for reduction and move ordering decisions. History
-////
+/// entries are stored according only to moving piece and destination square,
-
+/// in particular two moves with different origin but same destination and
-/// The History class stores statistics about how often different moves have
+/// same piece will be considered identical.
-/// been successful or unsuccessful during the current search.  These
-/// statistics are used for reduction and move ordering decisions.
 
 class History {
 
 public:
-  History();
   void clear();
-  void success(Piece p, Move m, Depth d);
+  Value value(Piece p, Square to) const;
-  void failure(Piece p, Move m);
+  void add(Piece p, Square to, Value bonus);
-  int move_ordering_score(Piece p, Move m) const;
+  Value gain(Piece p, Square to) const;
-  bool ok_to_prune(Piece p, Move m, Depth d) const;
+  void update_gain(Piece p, Square to, Value g);
+
+  static const Value MaxValue = Value(2000);
 
 private:
-  int history[16][64];  // [piece][square]
+  Value history[16][64];  // [piece][to_square]
-  int successCount[16][64];
+  Value maxGains[16][64]; // [piece][to_square]
-  int failureCount[16][64];
 };
 
+inline void History::clear() {
+  memset(history,  0, 16 * 64 * sizeof(Value));
+  memset(maxGains, 0, 16 * 64 * sizeof(Value));
+}
 
-////
+inline Value History::value(Piece p, Square to) const {
-//// Constants and variables
+  return history[p][to];
-////
+}
 
-/// HistoryMax controls how often the history counters will be scaled down:
+inline void History::add(Piece p, Square to, Value bonus) {
-/// When the history score for a move gets bigger than HistoryMax, all
+  if (abs(history[p][to] + bonus) < MaxValue) history[p][to] += bonus;
-/// entries in the table are divided by 2.  It is difficult to guess what
+}
-/// the ideal value of this constant is.  Scaling down the scores often has
-/// the effect that parts of the search tree which have been searched
-/// recently have a bigger importance for move ordering than the moves which
-/// have been searched a long time ago.
-///
-/// Note that HistoryMax should probably be changed whenever the constant
-/// OnePly in depth.h is changed.  This is somewhat annoying.  Perhaps it
-/// would be better to scale down the history table at regular intervals?
 
-const int HistoryMax = 50000;
+inline Value History::gain(Piece p, Square to) const {
+  return maxGains[p][to];
+}
 
+inline void History::update_gain(Piece p, Square to, Value g) {
+  maxGains[p][to] = std::max(g, maxGains[p][to] - 1);
+}
 
 #endif // !defined(HISTORY_H_INCLUDED)

src/lock.h

@@ -1,102 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(LOCK_H_INCLUDED)
-#define LOCK_H_INCLUDED
-
-
-// x86 assembly language locks or OS spin locks may perform faster than
-// mutex locks on some platforms.  On my machine, mutexes seem to be the
-// best.
-
-//#define ASM_LOCK
-//#define OS_SPIN_LOCK
-
-
-#if defined(ASM_LOCK)
-
-
-typedef volatile int Lock;
-
-static inline void LockX86(Lock *lock) {
-  int dummy;
-  asm __volatile__("1:          movl    $1, %0" "\n\t"
-      "            xchgl   (%1), %0" "\n\t" "            testl   %0, %0" "\n\t"
-      "            jz      3f" "\n\t" "2:          pause" "\n\t"
-      "            movl    (%1), %0" "\n\t" "            testl   %0, %0" "\n\t"
-      "            jnz     2b" "\n\t" "            jmp     1b" "\n\t" "3:"
-      "\n\t":"=&q"(dummy)
-      :"q"(lock)
-      :"cc");
-}
-
-static inline void UnlockX86(Lock *lock) {
-  int dummy;
-  asm __volatile__("movl    $0, (%1)":"=&q"(dummy)
-      :"q"(lock));
-}
-
-#  define lock_init(x, y) (*(x) = 0)
-#  define lock_grab(x) LockX86(x)
-#  define lock_release(x) UnlockX86(x)
-#  define lock_destroy(x)
-
-
-#elif defined(OS_SPIN_LOCK)
-
-
-#  include <libkern/OSAtomic.h>
-
-typedef OSSpinLock Lock;
-
-#  define lock_init(x, y) (*(x) = 0)
-#  define lock_grab(x) OSSpinLockLock(x)
-#  define lock_release(x) OSSpinLockUnlock(x)
-#  define lock_destroy(x)
-
-
-#elif !defined(_MSC_VER)
-
-#  include <pthread.h>
-
-typedef pthread_mutex_t Lock;
-
-#  define lock_init(x, y) pthread_mutex_init(x, y)
-#  define lock_grab(x) pthread_mutex_lock(x)
-#  define lock_release(x) pthread_mutex_unlock(x)
-#  define lock_destroy(x) pthread_mutex_destroy(x)
-
-
-#else
-
-
-#include <windows.h>
-
-typedef CRITICAL_SECTION Lock;
-#  define lock_init(x, y) InitializeCriticalSection(x)
-#  define lock_grab(x) EnterCriticalSection(x)
-#  define lock_release(x) LeaveCriticalSection(x)
-#  define lock_destroy(x) DeleteCriticalSection(x)
-
-
-#endif
-
-
-#endif // !defined(LOCK_H_INCLUDED)

src/main.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,81 +17,36 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-////
-//// Includes
-////
-
 #include <iostream>
+#include <string>
 
-#include "benchmark.h"
 #include "bitboard.h"
-#include "direction.h"
-#include "endgame.h"
 #include "evaluate.h"
-#include "material.h"
-#include "mersenne.h"
-#include "misc.h"
-#include "movepick.h"
 #include "position.h"
 #include "search.h"
 #include "thread.h"
-#include "uci.h"
+#include "tt.h"
 #include "ucioption.h"
 
-using std::string;
-
-////
-//// Functions
-////
-
 int main(int argc, char* argv[]) {
 
-  // Disable IO buffering
+  std::cout << engine_info() << std::endl;
-  std::cout.rdbuf()->pubsetbuf(NULL, 0);
-  std::cin.rdbuf()->pubsetbuf(NULL, 0);
 
-  // Initialization
+  UCI::init(Options);
-  init_mersenne();
+  Bitboards::init();
-  init_direction_table();
+  Zobrist::init();
-  init_bitboards();
+  Bitbases::init_kpk();
-  init_uci_options();
+  Search::init();
-  Position::init_zobrist();
+  Eval::init();
-  Position::init_piece_square_tables();
+  Threads.init();
-  MovePicker::init_phase_table();
+  TT.set_size(Options["Hash"]);
-  init_eval(1);
-  init_bitbases();
-  init_threads();
 
-  // Make random number generation less deterministic, for book moves
+  std::string args;
-  for (int i = abs(get_system_time() % 10000); i > 0; i--)
-      genrand_int32();
 
-  // Process command line arguments
+  for (int i = 1; i < argc; i++)
-  if (argc >= 2 && string(argv[1]) == "bench")
+      args += std::string(argv[i]) + " ";
-  {
+
-      if (argc < 4 || argc > 7)
+  UCI::loop(args);
-      {
+
-        std::cout << "Usage: stockfish bench <hash size> <threads> "
+  Threads.exit();
-                  << "[time = 60s] [fen positions file = default] "
-                  << "[time, depth or node limited = time]"
-                  << std::endl;
-        exit(0);
-      }
-      string time = argc > 4 ? argv[4] : "60";
-      string fen = argc > 5 ? argv[5] : "default";
-      string lim = argc > 6 ? argv[6] : "time";
-      benchmark(string(argv[2]) + " " + string(argv[3]) + " " + time + " " + fen + " " + lim);
-      return 0;
-  }
-
-  // Print copyright notice
-  std::cout << engine_name() << ".  Copyright (C) "
-            << "2004-2008 Tord Romstad, Marco Costalba. "
-            << std::endl;
-
-  // Enter UCI mode
-  uci_main_loop();
-
-  return 0;
 }

src/material.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,385 +17,260 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
+#include <algorithm>
-////
-//// Includes
-////
-
 #include <cassert>
 #include <cstring>
-#include <sstream>
-#include <map>
 
 #include "material.h"
 
-
+using namespace std;
-////
-//// Local definitions
-////
 
 namespace {
 
-  const Value BishopPairMidgameBonus = Value(109);
+  // Values modified by Joona Kiiski
-  const Value BishopPairEndgameBonus = Value(97);
+  const Value MidgameLimit = Value(15581);
+  const Value EndgameLimit = Value(3998);
 
-  Key KNNKMaterialKey, KKNNMaterialKey;
+  // Scale factors used when one side has no more pawns
+  const int NoPawnsSF[4] = { 6, 12, 32 };
 
+  // Polynomial material balance parameters
+  const Value RedundantQueenPenalty = Value(320);
+  const Value RedundantRookPenalty  = Value(554);
+
+  const int LinearCoefficients[6] = { 1617, -162, -1172, -190, 105, 26 };
+
+  const int QuadraticCoefficientsSameColor[][8] = {
+  { 7, 7, 7, 7, 7, 7 }, { 39, 2, 7, 7, 7, 7 }, { 35, 271, -4, 7, 7, 7 },
+  { 7, 25, 4, 7, 7, 7 }, { -27, -2, 46, 100, 56, 7 }, { 58, 29, 83, 148, -3, -25 } };
+
+  const int QuadraticCoefficientsOppositeColor[][8] = {
+  { 41, 41, 41, 41, 41, 41 }, { 37, 41, 41, 41, 41, 41 }, { 10, 62, 41, 41, 41, 41 },
+  { 57, 64, 39, 41, 41, 41 }, { 50, 40, 23, -22, 41, 41 }, { 106, 101, 3, 151, 171, 41 } };
+
+  // Endgame evaluation and scaling functions accessed direcly and not through
+  // the function maps because correspond to more then one material hash key.
+  Endgame<KmmKm> EvaluateKmmKm[] = { Endgame<KmmKm>(WHITE), Endgame<KmmKm>(BLACK) };
+  Endgame<KXK>   EvaluateKXK[]   = { Endgame<KXK>(WHITE),   Endgame<KXK>(BLACK) };
+
+  Endgame<KBPsK>  ScaleKBPsK[]  = { Endgame<KBPsK>(WHITE),  Endgame<KBPsK>(BLACK) };
+  Endgame<KQKRPs> ScaleKQKRPs[] = { Endgame<KQKRPs>(WHITE), Endgame<KQKRPs>(BLACK) };
+  Endgame<KPsK>   ScaleKPsK[]   = { Endgame<KPsK>(WHITE),   Endgame<KPsK>(BLACK) };
+  Endgame<KPKP>   ScaleKPKP[]   = { Endgame<KPKP>(WHITE),   Endgame<KPKP>(BLACK) };
+
+  // Helper templates used to detect a given material distribution
+  template<Color Us> bool is_KXK(const Position& pos) {
+    const Color Them = (Us == WHITE ? BLACK : WHITE);
+    return   pos.non_pawn_material(Them) == VALUE_ZERO
+          && pos.piece_count(Them, PAWN) == 0
+          && pos.non_pawn_material(Us)   >= RookValueMg;
   }
 
-////
+  template<Color Us> bool is_KBPsKs(const Position& pos) {
-//// Classes
+    return   pos.non_pawn_material(Us)   == BishopValueMg
-////
+          && pos.piece_count(Us, BISHOP) == 1
-
+          && pos.piece_count(Us, PAWN)   >= 1;
-
-/// See header for a class description. It is declared here to avoid
-/// to include <map> in the header file.
-
-class EndgameFunctions {
-
-public:
-  EndgameFunctions();
-  EndgameEvaluationFunctionBase* getEEF(Key key) const;
-  EndgameScalingFunctionBase* getESF(Key key, Color* c) const;
-
-private:
-  void add(const std::string& keyCode, EndgameEvaluationFunctionBase* f);
-  void add(const std::string& keyCode, Color c, EndgameScalingFunctionBase* f);
-  Key buildKey(const std::string& keyCode);
-
-  struct ScalingInfo
-  {
-      Color col;
-      EndgameScalingFunctionBase* fun;
-  };
-
-  std::map<Key, EndgameEvaluationFunctionBase*> EEFmap;
-  std::map<Key, ScalingInfo> ESFmap;
-};
-
-
-////
-//// Functions
-////
-
-
-/// Constructor for the MaterialInfoTable class
-
-MaterialInfoTable::MaterialInfoTable(unsigned int numOfEntries) {
-
-  size = numOfEntries;
-  entries = new MaterialInfo[size];
-  funcs = new EndgameFunctions();
-  if (!entries || !funcs)
-  {
-      std::cerr << "Failed to allocate " << (numOfEntries * sizeof(MaterialInfo))
-                << " bytes for material hash table." << std::endl;
-      exit(EXIT_FAILURE);
-  }
-  clear();
   }
 
-
+  template<Color Us> bool is_KQKRPs(const Position& pos) {
-/// Destructor for the MaterialInfoTable class
+    const Color Them = (Us == WHITE ? BLACK : WHITE);
-
+    return   pos.piece_count(Us, PAWN)    == 0
-MaterialInfoTable::~MaterialInfoTable() {
+          && pos.non_pawn_material(Us)    == QueenValueMg
-
+          && pos.piece_count(Us, QUEEN)   == 1
-  delete [] entries;
+          && pos.piece_count(Them, ROOK)  == 1
-  delete funcs;
+          && pos.piece_count(Them, PAWN)  >= 1;
   }
 
-
+} // namespace
-/// MaterialInfoTable::clear() clears a material hash table by setting
-/// all entries to 0.
-
-void MaterialInfoTable::clear() {
-
-  memset(entries, 0, size * sizeof(MaterialInfo));
-}
 
 
-/// MaterialInfoTable::get_material_info() takes a position object as input,
+/// MaterialTable::probe() takes a position object as input, looks up a MaterialEntry
-/// computes or looks up a MaterialInfo object, and returns a pointer to it.
+/// object, and returns a pointer to it. If the material configuration is not
-/// If the material configuration is not already present in the table, it
+/// already present in the table, it is computed and stored there, so we don't
-/// is stored there, so we don't have to recompute everything when the
+/// have to recompute everything when the same material configuration occurs again.
-/// same material configuration occurs again.
 
-MaterialInfo* MaterialInfoTable::get_material_info(const Position& pos) {
+MaterialEntry* MaterialTable::probe(const Position& pos) {
 
-  Key key = pos.get_material_key();
+  Key key = pos.material_key();
-  int index = key & (size - 1);
+  MaterialEntry* e = entries[key];
-  MaterialInfo* mi = entries + index;
 
-  // If mi->key matches the position's material hash key, it means that we
+  // If e->key matches the position's material hash key, it means that we
   // have analysed this material configuration before, and we can simply
   // return the information we found the last time instead of recomputing it.
-  if (mi->key == key)
+  if (e->key == key)
-      return mi;
+      return e;
 
-  // Clear the MaterialInfo object, and set its key
+  memset(e, 0, sizeof(MaterialEntry));
-  mi->clear();
+  e->key = key;
-  mi->key = key;
+  e->factor[WHITE] = e->factor[BLACK] = (uint8_t)SCALE_FACTOR_NORMAL;
-
+  e->gamePhase = MaterialTable::game_phase(pos);
-  // A special case before looking for a specialized evaluation function
-  // KNN vs K is a draw.
-  if (key == KNNKMaterialKey || key == KKNNMaterialKey)
-  {
-      mi->factor[WHITE] = mi->factor[BLACK] = 0;
-      return mi;
-  }
 
   // Let's look if we have a specialized evaluation function for this
   // particular material configuration. First we look for a fixed
   // configuration one, then a generic one if previous search failed.
-  if ((mi->evaluationFunction = funcs->getEEF(key)) != NULL)
+  if (endgames.probe(key, e->evaluationFunction))
-      return mi;
+      return e;
 
-  else if (   pos.non_pawn_material(BLACK) == Value(0)
+  if (is_KXK<WHITE>(pos))
-           && pos.piece_count(BLACK, PAWN) == 0
-           && pos.non_pawn_material(WHITE) >= RookValueEndgame)
   {
-      mi->evaluationFunction = &EvaluateKXK;
+      e->evaluationFunction = &EvaluateKXK[WHITE];
-      return mi;
+      return e;
   }
-  else if (   pos.non_pawn_material(WHITE) == Value(0)
+
-           && pos.piece_count(WHITE, PAWN) == 0
+  if (is_KXK<BLACK>(pos))
-           && pos.non_pawn_material(BLACK) >= RookValueEndgame)
   {
-      mi->evaluationFunction = &EvaluateKKX;
+      e->evaluationFunction = &EvaluateKXK[BLACK];
-      return mi;
+      return e;
   }
-  else if (   pos.pawns() == EmptyBoardBB
+
-           && pos.rooks() == EmptyBoardBB
+  if (!pos.pieces(PAWN) && !pos.pieces(ROOK) && !pos.pieces(QUEEN))
-           && pos.queens() == EmptyBoardBB)
   {
-      // Minor piece endgame with at least one minor piece per side,
+      // Minor piece endgame with at least one minor piece per side and
-      // and no pawns.
+      // no pawns. Note that the case KmmK is already handled by KXK.
-      assert(pos.knights(WHITE) | pos.bishops(WHITE));
+      assert((pos.pieces(WHITE, KNIGHT) | pos.pieces(WHITE, BISHOP)));
-      assert(pos.knights(BLACK) | pos.bishops(BLACK));
+      assert((pos.pieces(BLACK, KNIGHT) | pos.pieces(BLACK, BISHOP)));
 
       if (   pos.piece_count(WHITE, BISHOP) + pos.piece_count(WHITE, KNIGHT) <= 2
           && pos.piece_count(BLACK, BISHOP) + pos.piece_count(BLACK, KNIGHT) <= 2)
       {
-          mi->evaluationFunction = &EvaluateKmmKm;
+          e->evaluationFunction = &EvaluateKmmKm[pos.side_to_move()];
-          return mi;
+          return e;
       }
   }
 
   // OK, we didn't find any special evaluation function for the current
   // material configuration. Is there a suitable scaling function?
   //
-  // The code below is rather messy, and it could easily get worse later,
+  // We face problems when there are several conflicting applicable
-  // if we decide to add more special cases.  We face problems when there
+  // scaling functions and we need to decide which one to use.
-  // are several conflicting applicable scaling functions and we need to
+  EndgameBase<ScaleFactor>* sf;
-  // decide which one to use.
-  Color c;
-  EndgameScalingFunctionBase* sf;
 
-  if ((sf = funcs->getESF(key, &c)) != NULL)
+  if (endgames.probe(key, sf))
   {
-      mi->scalingFunction[c] = sf;
+      e->scalingFunction[sf->color()] = sf;
-      return mi;
+      return e;
   }
 
-  if (   pos.non_pawn_material(WHITE) == BishopValueMidgame
+  // Generic scaling functions that refer to more then one material
-      && pos.piece_count(WHITE, BISHOP) == 1
+  // distribution. Should be probed after the specialized ones.
-      && pos.piece_count(WHITE, PAWN) >= 1)
+  // Note that these ones don't return after setting the function.
-      mi->scalingFunction[WHITE] = &ScaleKBPK;
+  if (is_KBPsKs<WHITE>(pos))
+      e->scalingFunction[WHITE] = &ScaleKBPsK[WHITE];
 
-  if (   pos.non_pawn_material(BLACK) == BishopValueMidgame
+  if (is_KBPsKs<BLACK>(pos))
-      && pos.piece_count(BLACK, BISHOP) == 1
+      e->scalingFunction[BLACK] = &ScaleKBPsK[BLACK];
-      && pos.piece_count(BLACK, PAWN) >= 1)
-      mi->scalingFunction[BLACK] = &ScaleKKBP;
 
-  if (   pos.piece_count(WHITE, PAWN) == 0
+  if (is_KQKRPs<WHITE>(pos))
-      && pos.non_pawn_material(WHITE) == QueenValueMidgame
+      e->scalingFunction[WHITE] = &ScaleKQKRPs[WHITE];
-      && pos.piece_count(WHITE, QUEEN) == 1
-      && pos.piece_count(BLACK, ROOK) == 1
-      && pos.piece_count(BLACK, PAWN) >= 1)
-      mi->scalingFunction[WHITE] = &ScaleKQKRP;
 
-  else if (   pos.piece_count(BLACK, PAWN) == 0
+  else if (is_KQKRPs<BLACK>(pos))
-           && pos.non_pawn_material(BLACK) == QueenValueMidgame
+      e->scalingFunction[BLACK] = &ScaleKQKRPs[BLACK];
-           && pos.piece_count(BLACK, QUEEN) == 1
-           && pos.piece_count(WHITE, ROOK) == 1
-           && pos.piece_count(WHITE, PAWN) >= 1)
-      mi->scalingFunction[BLACK] = &ScaleKRPKQ;
 
-  if (pos.non_pawn_material(WHITE) + pos.non_pawn_material(BLACK) == Value(0))
+  Value npm_w = pos.non_pawn_material(WHITE);
+  Value npm_b = pos.non_pawn_material(BLACK);
+
+  if (npm_w + npm_b == VALUE_ZERO)
   {
       if (pos.piece_count(BLACK, PAWN) == 0)
       {
           assert(pos.piece_count(WHITE, PAWN) >= 2);
-          mi->scalingFunction[WHITE] = &ScaleKPsK;
+          e->scalingFunction[WHITE] = &ScaleKPsK[WHITE];
       }
       else if (pos.piece_count(WHITE, PAWN) == 0)
       {
           assert(pos.piece_count(BLACK, PAWN) >= 2);
-          mi->scalingFunction[BLACK] = &ScaleKKPs;
+          e->scalingFunction[BLACK] = &ScaleKPsK[BLACK];
       }
       else if (pos.piece_count(WHITE, PAWN) == 1 && pos.piece_count(BLACK, PAWN) == 1)
       {
-          mi->scalingFunction[WHITE] = &ScaleKPKPw;
+          // This is a special case because we set scaling functions
-          mi->scalingFunction[BLACK] = &ScaleKPKPb;
+          // for both colors instead of only one.
+          e->scalingFunction[WHITE] = &ScaleKPKP[WHITE];
+          e->scalingFunction[BLACK] = &ScaleKPKP[BLACK];
       }
   }
 
+  // No pawns makes it difficult to win, even with a material advantage
+  if (pos.piece_count(WHITE, PAWN) == 0 && npm_w - npm_b <= BishopValueMg)
+  {
+      e->factor[WHITE] = (uint8_t)
+      (npm_w == npm_b || npm_w < RookValueMg ? 0 : NoPawnsSF[std::min(pos.piece_count(WHITE, BISHOP), 2)]);
+  }
+
+  if (pos.piece_count(BLACK, PAWN) == 0 && npm_b - npm_w <= BishopValueMg)
+  {
+      e->factor[BLACK] = (uint8_t)
+      (npm_w == npm_b || npm_b < RookValueMg ? 0 : NoPawnsSF[std::min(pos.piece_count(BLACK, BISHOP), 2)]);
+  }
+
   // Compute the space weight
-  if (pos.non_pawn_material(WHITE) + pos.non_pawn_material(BLACK) >=
+  if (npm_w + npm_b >= 2 * QueenValueMg + 4 * RookValueMg + 2 * KnightValueMg)
-      2*QueenValueMidgame + 4*RookValueMidgame + 2*KnightValueMidgame)
   {
-      int minorPieceCount =  pos.piece_count(WHITE, KNIGHT)
+      int minorPieceCount =  pos.piece_count(WHITE, KNIGHT) + pos.piece_count(WHITE, BISHOP)
-                           + pos.piece_count(BLACK, KNIGHT)
+                           + pos.piece_count(BLACK, KNIGHT) + pos.piece_count(BLACK, BISHOP);
-                           + pos.piece_count(WHITE, BISHOP)
-                           + pos.piece_count(BLACK, BISHOP);
 
-      mi->spaceWeight = minorPieceCount * minorPieceCount;
+      e->spaceWeight = minorPieceCount * minorPieceCount;
   }
 
-  // Evaluate the material balance
+  // Evaluate the material imbalance. We use PIECE_TYPE_NONE as a place holder
+  // for the bishop pair "extended piece", this allow us to be more flexible
+  // in defining bishop pair bonuses.
+  const int pieceCount[2][8] = {
+  { pos.piece_count(WHITE, BISHOP) > 1, pos.piece_count(WHITE, PAWN), pos.piece_count(WHITE, KNIGHT),
+    pos.piece_count(WHITE, BISHOP)    , pos.piece_count(WHITE, ROOK), pos.piece_count(WHITE, QUEEN) },
+  { pos.piece_count(BLACK, BISHOP) > 1, pos.piece_count(BLACK, PAWN), pos.piece_count(BLACK, KNIGHT),
+    pos.piece_count(BLACK, BISHOP)    , pos.piece_count(BLACK, ROOK), pos.piece_count(BLACK, QUEEN) } };
 
-  int sign;
+  e->value = (int16_t)((imbalance<WHITE>(pieceCount) - imbalance<BLACK>(pieceCount)) / 16);
-  Value egValue = Value(0);
+  return e;
-  Value mgValue = Value(0);
+}
 
-  for (c = WHITE, sign = 1; c <= BLACK; c++, sign = -sign)
+
+/// MaterialTable::imbalance() calculates imbalance comparing piece count of each
+/// piece type for both colors.
+
+template<Color Us>
+int MaterialTable::imbalance(const int pieceCount[][8]) {
+
+  const Color Them = (Us == WHITE ? BLACK : WHITE);
+
+  int pt1, pt2, pc, v;
+  int value = 0;
+
+  // Redundancy of major pieces, formula based on Kaufman's paper
+  // "The Evaluation of Material Imbalances in Chess"
+  if (pieceCount[Us][ROOK] > 0)
+      value -=  RedundantRookPenalty * (pieceCount[Us][ROOK] - 1)
+              + RedundantQueenPenalty * pieceCount[Us][QUEEN];
+
+  // Second-degree polynomial material imbalance by Tord Romstad
+  for (pt1 = NO_PIECE_TYPE; pt1 <= QUEEN; pt1++)
   {
-    // No pawns makes it difficult to win, even with a material advantage
+      pc = pieceCount[Us][pt1];
-    if (   pos.piece_count(c, PAWN) == 0
+      if (!pc)
-        && pos.non_pawn_material(c) - pos.non_pawn_material(opposite_color(c)) <= BishopValueMidgame)
+          continue;
-    {
-        if (   pos.non_pawn_material(c) == pos.non_pawn_material(opposite_color(c))
-            || pos.non_pawn_material(c) < RookValueMidgame)
-            mi->factor[c] = 0;
-        else
-        {
-            switch (pos.piece_count(c, BISHOP)) {
-            case 2:
-                mi->factor[c] = 32;
-                break;
-            case 1:
-                mi->factor[c] = 12;
-                break;
-            case 0:
-                mi->factor[c] = 6;
-                break;
-            }
-        }
-    }
 
-    // Bishop pair
+      v = LinearCoefficients[pt1];
-    if (pos.piece_count(c, BISHOP) >= 2)
-    {
-        mgValue += sign * BishopPairMidgameBonus;
-        egValue += sign * BishopPairEndgameBonus;
-    }
 
-    // Knights are stronger when there are many pawns on the board.  The
+      for (pt2 = NO_PIECE_TYPE; pt2 <= pt1; pt2++)
-    // formula is taken from Larry Kaufman's paper "The Evaluation of Material
+          v +=  QuadraticCoefficientsSameColor[pt1][pt2] * pieceCount[Us][pt2]
-    // Imbalances in Chess":
+              + QuadraticCoefficientsOppositeColor[pt1][pt2] * pieceCount[Them][pt2];
-    // http://mywebpages.comcast.net/danheisman/Articles/evaluation_of_material_imbalance.htm
-    mgValue += sign * Value(pos.piece_count(c, KNIGHT)*(pos.piece_count(c, PAWN)-5)*16);
-    egValue += sign * Value(pos.piece_count(c, KNIGHT)*(pos.piece_count(c, PAWN)-5)*16);
 
-    // Redundancy of major pieces, again based on Kaufman's paper:
+      value += pc * v;
-    if (pos.piece_count(c, ROOK) >= 1)
-    {
-        Value v = Value((pos.piece_count(c, ROOK) - 1) * 32 + pos.piece_count(c, QUEEN) * 16);
-        mgValue -= sign * v;
-        egValue -= sign * v;
   }
-  }
+  return value;
-  mi->mgValue = int16_t(mgValue);
-  mi->egValue = int16_t(egValue);
-  return mi;
 }
 
 
-/// EndgameFunctions member definitions. This class is used to store the maps
+/// MaterialTable::game_phase() calculates the phase given the current
-/// of end game and scaling functions that MaterialInfoTable will query for
+/// position. Because the phase is strictly a function of the material, it
-/// each key. The maps are constant and are populated only at construction,
+/// is stored in MaterialEntry.
-/// but are per-thread instead of globals to avoid expensive locks.
 
-EndgameFunctions::EndgameFunctions() {
+Phase MaterialTable::game_phase(const Position& pos) {
 
-  KNNKMaterialKey = buildKey("KNNK");
+  Value npm = pos.non_pawn_material(WHITE) + pos.non_pawn_material(BLACK);
-  KKNNMaterialKey = buildKey("KKNN");
 
-  add("KPK",   &EvaluateKPK);
+  return  npm >= MidgameLimit ? PHASE_MIDGAME
-  add("KKP",   &EvaluateKKP);
+        : npm <= EndgameLimit ? PHASE_ENDGAME
-  add("KBNK",  &EvaluateKBNK);
+        : Phase(((npm - EndgameLimit) * 128) / (MidgameLimit - EndgameLimit));
-  add("KKBN",  &EvaluateKKBN);
-  add("KRKP",  &EvaluateKRKP);
-  add("KPKR",  &EvaluateKPKR);
-  add("KRKB",  &EvaluateKRKB);
-  add("KBKR",  &EvaluateKBKR);
-  add("KRKN",  &EvaluateKRKN);
-  add("KNKR",  &EvaluateKNKR);
-  add("KQKR",  &EvaluateKQKR);
-  add("KRKQ",  &EvaluateKRKQ);
-  add("KBBKN", &EvaluateKBBKN);
-  add("KNKBB", &EvaluateKNKBB);
-
-  add("KNPK",    WHITE, &ScaleKNPK);
-  add("KKNP",    BLACK, &ScaleKKNP);
-  add("KRPKR",   WHITE, &ScaleKRPKR);
-  add("KRKRP",   BLACK, &ScaleKRKRP);
-  add("KBPKB",   WHITE, &ScaleKBPKB);
-  add("KBKBP",   BLACK, &ScaleKBKBP);
-  add("KBPPKB",  WHITE, &ScaleKBPPKB);
-  add("KBKBPP",  BLACK, &ScaleKBKBPP);
-  add("KBPKN",   WHITE, &ScaleKBPKN);
-  add("KNKBP",   BLACK, &ScaleKNKBP);
-  add("KRPPKRP", WHITE, &ScaleKRPPKRP);
-  add("KRPKRPP", BLACK, &ScaleKRPKRPP);
-  add("KRPPKRP", WHITE, &ScaleKRPPKRP);
-  add("KRPKRPP", BLACK, &ScaleKRPKRPP);
-}
-
-Key EndgameFunctions::buildKey(const std::string& keyCode) {
-
-    assert(keyCode.length() > 0 && keyCode[0] == 'K');
-    assert(keyCode.length() < 8);
-
-    std::stringstream s;
-    bool upcase = false;
-
-    // Build up a fen substring with the given pieces, note
-    // that the fen string could be of an illegal position.
-    for (size_t i = 0; i < keyCode.length(); i++)
-    {
-        if (keyCode[i] == 'K')
-            upcase = !upcase;
-
-        s << char(upcase? toupper(keyCode[i]) : tolower(keyCode[i]));
-    }
-    s << 8 - keyCode.length() << "/8/8/8/8/8/8/8 w -";
-    return Position(s.str()).get_material_key();
-}
-
-void EndgameFunctions::add(const std::string& keyCode, EndgameEvaluationFunctionBase* f) {
-
-  EEFmap.insert(std::pair<Key, EndgameEvaluationFunctionBase*>(buildKey(keyCode), f));
-}
-
-void EndgameFunctions::add(const std::string& keyCode, Color c, EndgameScalingFunctionBase* f) {
-
-  ScalingInfo s = {c, f};
-  ESFmap.insert(std::pair<Key, ScalingInfo>(buildKey(keyCode), s));
-}
-
-EndgameEvaluationFunctionBase* EndgameFunctions::getEEF(Key key) const {
-
-  std::map<Key, EndgameEvaluationFunctionBase*>::const_iterator it(EEFmap.find(key));
-  return (it != EEFmap.end() ? it->second : NULL);
-}
-
-EndgameScalingFunctionBase* EndgameFunctions::getESF(Key key, Color* c) const {
-
-  std::map<Key, ScalingInfo>::const_iterator it(ESFmap.find(key));
-  if (it == ESFmap.end())
-      return NULL;
-
-  *c = it->second.col;
-  return it->second.fun;
 }

src/material.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,24 +17,24 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(MATERIAL_H_INCLUDED)
 #define MATERIAL_H_INCLUDED
 
-////
-//// Includes
-////
-
 #include "endgame.h"
+#include "misc.h"
 #include "position.h"
-#include "scale.h"
+#include "types.h"
+
+const int MaterialTableSize = 8192;
+
+/// Game phase
+enum Phase {
+  PHASE_ENDGAME = 0,
+  PHASE_MIDGAME = 128
+};
 
 
-////
+/// MaterialEntry is a class which contains various information about a
-//// Types
-////
-
-/// MaterialInfo is a class which contains various information about a
 /// material configuration. It contains a material balance evaluation,
 /// a function pointer to a special endgame evaluation function (which in
 /// most cases is NULL, meaning that the standard evaluation function will
@@ -44,135 +44,77 @@
 /// For instance, in KRB vs KR endgames, the score is scaled down by a factor
 /// of 4, which will result in scores of absolute value less than one pawn.
 
-class MaterialInfo {
+class MaterialEntry {
 
-  friend class MaterialInfoTable;
+  friend struct MaterialTable;
 
 public:
-  Value mg_value() const;
+  Score material_value() const;
-  Value eg_value() const;
   ScaleFactor scale_factor(const Position& pos, Color c) const;
   int space_weight() const;
+  Phase game_phase() const;
   bool specialized_eval_exists() const;
   Value evaluate(const Position& pos) const;
 
 private:
-  void clear();
-
   Key key;
-  int16_t mgValue;
+  int16_t value;
-  int16_t egValue;
   uint8_t factor[2];
-  EndgameEvaluationFunctionBase* evaluationFunction;
+  EndgameBase<Value>* evaluationFunction;
-  EndgameScalingFunctionBase* scalingFunction[2];
+  EndgameBase<ScaleFactor>* scalingFunction[2];
   int spaceWeight;
+  Phase gamePhase;
 };
 
 
-/// EndgameFunctions class stores the endgame evaluation functions std::map.
+/// The MaterialTable class represents a material hash table. The most important
-/// Because STL library is not thread safe even for read access, the maps,
+/// method is probe(), which returns a pointer to a MaterialEntry object.
-/// although with identical content, are replicated for each thread. This
-/// is faster then using locks with an unique set of global maps.
 
-class EndgameFunctions;
+struct MaterialTable {
 
+  MaterialEntry* probe(const Position& pos);
+  static Phase game_phase(const Position& pos);
+  template<Color Us> static int imbalance(const int pieceCount[][8]);
 
-/// The MaterialInfoTable class represents a pawn hash table. It is basically
+  HashTable<MaterialEntry, MaterialTableSize> entries;
-/// just an array of MaterialInfo objects and a few methods for accessing these
+  Endgames endgames;
-/// objects. The most important method is get_material_info, which looks up a
-/// position in the table and returns a pointer to a MaterialInfo object.
-
-class MaterialInfoTable {
-
-public:
-  MaterialInfoTable(unsigned numOfEntries);
-  ~MaterialInfoTable();
-  void clear();
-  MaterialInfo* get_material_info(const Position& pos);
-
-private:
-  unsigned size;
-  MaterialInfo* entries;
-  EndgameFunctions* funcs;
 };
 
 
-////
+/// MaterialEntry::scale_factor takes a position and a color as input, and
-//// Inline functions
-////
-
-/// MaterialInfo::mg_value and MaterialInfo::eg_value simply returns the
-/// material balance evaluation for the middle game and the endgame.
-
-inline Value MaterialInfo::mg_value() const {
-
-  return Value(mgValue);
-}
-
-inline Value MaterialInfo::eg_value() const {
-
-  return Value(egValue);
-}
-
-
-/// MaterialInfo::clear() resets a MaterialInfo object to an empty state,
-/// with all slots at their default values.
-
-inline void MaterialInfo::clear() {
-
-  mgValue = egValue = 0;
-  factor[WHITE] = factor[BLACK] = uint8_t(SCALE_FACTOR_NORMAL);
-  spaceWeight = 0;
-  evaluationFunction = NULL;
-  scalingFunction[WHITE] = scalingFunction[BLACK] = NULL;
-}
-
-
-/// MaterialInfo::scale_factor takes a position and a color as input, and
 /// returns a scale factor for the given color. We have to provide the
 /// position in addition to the color, because the scale factor need not
 /// to be a constant: It can also be a function which should be applied to
 /// the position. For instance, in KBP vs K endgames, a scaling function
 /// which checks for draws with rook pawns and wrong-colored bishops.
 
-inline ScaleFactor MaterialInfo::scale_factor(const Position& pos, Color c) const {
+inline ScaleFactor MaterialEntry::scale_factor(const Position& pos, Color c) const {
 
-  if (scalingFunction[c] != NULL)
+  if (!scalingFunction[c])
-  {
-      ScaleFactor sf = scalingFunction[c]->apply(pos);
-      if (sf != SCALE_FACTOR_NONE)
-          return sf;
-  }
       return ScaleFactor(factor[c]);
+
+  ScaleFactor sf = (*scalingFunction[c])(pos);
+  return sf == SCALE_FACTOR_NONE ? ScaleFactor(factor[c]) : sf;
 }
 
+inline Value MaterialEntry::evaluate(const Position& pos) const {
+  return (*evaluationFunction)(pos);
+}
 
-/// MaterialInfo::space_weight() simply returns the weight for the space
+inline Score MaterialEntry::material_value() const {
-/// evaluation for this material configuration.
+  return make_score(value, value);
-
+}
-inline int MaterialInfo::space_weight() const {
 
+inline int MaterialEntry::space_weight() const {
   return spaceWeight;
 }
 
+inline Phase MaterialEntry::game_phase() const {
+  return gamePhase;
+}
 
-/// MaterialInfo::specialized_eval_exists decides whether there is a
+inline bool MaterialEntry::specialized_eval_exists() const {
-/// specialized evaluation function for the current material configuration,
-/// or if the normal evaluation function should be used.
-
-inline bool MaterialInfo::specialized_eval_exists() const {
-
   return evaluationFunction != NULL;
 }
 
-
-/// MaterialInfo::evaluate applies a specialized evaluation function
-/// to a given position object.  It should only be called when
-/// specialized_eval_exists() returns 'true'.
-
-inline Value MaterialInfo::evaluate(const Position& pos) const {
-
-  return evaluationFunction->apply(pos);
-}
-
 #endif // !defined(MATERIAL_H_INCLUDED)

src/mersenne.cpp

@@ -1,149 +0,0 @@
-/*
-   A C-program for MT19937, with initialization improved 2002/1/26.
-   Coded by Takuji Nishimura and Makoto Matsumoto.
-
-   Before using, initialize the state by using init_genrand(seed)
-   or init_by_array(init_key, key_length).
-
-   Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,
-   All rights reserved.
-
-   Redistribution and use in source and binary forms, with or without
-   modification, are permitted provided that the following conditions
-   are met:
-
-     1. Redistributions of source code must retain the above copyright
-        notice, this list of conditions and the following disclaimer.
-
-     2. Redistributions in binary form must reproduce the above copyright
-        notice, this list of conditions and the following disclaimer in the
-        documentation and/or other materials provided with the distribution.
-
-     3. The names of its contributors may not be used to endorse or promote
-        products derived from this software without specific prior written
-        permission.
-
-   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
-   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
-   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
-   Any feedback is very welcome.
-   http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html
-   email: m-mat @ math.sci.hiroshima-u.ac.jp (remove space)
-*/
-
-#include "types.h"
-#include "mersenne.h"
-
-/* Period parameters */
-#define N 624
-#define M 397
-#define MATRIX_A 0x9908b0dfUL   /* constant vector a */
-#define UPPER_MASK 0x80000000UL /* most significant w-r bits */
-#define LOWER_MASK 0x7fffffffUL /* least significant r bits */
-
-static unsigned long mt[N]; /* the array for the state vector  */
-static int mti=N+1; /* mti==N+1 means mt[N] is not initialized */
-
-/* initializes mt[N] with a seed */
-static void init_genrand(unsigned long s)
-{
-    mt[0]= s & 0xffffffffUL;
-    for (mti=1; mti<N; mti++) {
-        mt[mti] =
-            (1812433253UL * (mt[mti-1] ^ (mt[mti-1] >> 30)) + mti);
-        /* See Knuth TAOCP Vol2. 3rd Ed. P.106 for multiplier. */
-        /* In the previous versions, MSBs of the seed affect   */
-        /* only MSBs of the array mt[].                        */
-        /* 2002/01/09 modified by Makoto Matsumoto             */
-        mt[mti] &= 0xffffffffUL;
-        /* for >32 bit machines */
-    }
-}
-
-/* initialize by an array with array-length */
-/* init_key is the array for initializing keys */
-/* key_length is its length */
-/* slight change for C++, 2004/2/26 */
-static void init_by_array(unsigned long init_key[], int key_length)
-{
-    int i, j, k;
-    init_genrand(19650218UL);
-    i=1; j=0;
-    k = (N>key_length ? N : key_length);
-    for (; k; k--) {
-        mt[i] = (mt[i] ^ ((mt[i-1] ^ (mt[i-1] >> 30)) * 1664525UL))
-          + init_key[j] + j; /* non linear */
-        mt[i] &= 0xffffffffUL; /* for WORDSIZE > 32 machines */
-        i++; j++;
-        if (i>=N) { mt[0] = mt[N-1]; i=1; }
-        if (j>=key_length) j=0;
-    }
-    for (k=N-1; k; k--) {
-        mt[i] = (mt[i] ^ ((mt[i-1] ^ (mt[i-1] >> 30)) * 1566083941UL))
-          - i; /* non linear */
-        mt[i] &= 0xffffffffUL; /* for WORDSIZE > 32 machines */
-        i++;
-        if (i>=N) { mt[0] = mt[N-1]; i=1; }
-    }
-
-    mt[0] = 0x80000000UL; /* MSB is 1; assuring non-zero initial array */
-}
-
-/* generates a random number on [0,0xffffffff]-interval */
-uint32_t genrand_int32(void) {
-  unsigned long y;
-  static unsigned long mag01[2]={0x0UL, MATRIX_A};
-  /* mag01[x] = x * MATRIX_A  for x=0,1 */
-
-  if (mti >= N) { /* generate N words at one time */
-    int kk;
-
-    if (mti == N+1)   /* if init_genrand() has not been called, */
-      init_genrand(5489UL); /* a default initial seed is used */
-
-    for (kk=0;kk<N-M;kk++) {
-      y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);
-      mt[kk] = mt[kk+M] ^ (y >> 1) ^ mag01[y & 0x1UL];
-    }
-    for (;kk<N-1;kk++) {
-      y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);
-      mt[kk] = mt[kk+(M-N)] ^ (y >> 1) ^ mag01[y & 0x1UL];
-    }
-    y = (mt[N-1]&UPPER_MASK)|(mt[0]&LOWER_MASK);
-    mt[N-1] = mt[M-1] ^ (y >> 1) ^ mag01[y & 0x1UL];
-
-    mti = 0;
-  }
-
-  y = mt[mti++];
-
-  /* Tempering */
-  y ^= (y >> 11);
-  y ^= (y << 7) & 0x9d2c5680UL;
-  y ^= (y << 15) & 0xefc60000UL;
-  y ^= (y >> 18);
-
-  return y;
-}
-
-uint64_t genrand_int64(void) {
-  uint64_t x, y;
-
-  x = genrand_int32(); y = genrand_int32();
-  return (x<<32)|y;
-}
-
-void init_mersenne(void) {
-  unsigned long init[4]={0x123, 0x234, 0x345, 0x456}, length=4;
-  init_by_array(init, length);
-}

src/misc.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,272 +17,228 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-////
-//// Includes
-////
-
-#if !defined(_MSC_VER)
-
-#  include <sys/time.h>
-#  include <sys/types.h>
-#  include <unistd.h>
-
-#else
-/*
-   (c) Copyright 1992 Eric Backus
-
-   This software may be used freely so long as this copyright notice is
-   left intact. There is no warrantee on this software.
-*/
-#  include <windows.h>
-#  include <time.h>
-#  include "dos.h"
-static int gettimeofday(struct timeval* tp, struct timezone*)
-{
-    SYSTEMTIME systime;
-
-    if (tp)
-    {
-        struct tm tmrec;
-        time_t theTime = time(NULL);
-
-        tmrec = *localtime(&theTime);
-        tp->tv_sec = mktime(&tmrec);
-        GetLocalTime(&systime); /* system time */
-
-        tp->tv_usec = systime.wMilliseconds * 1000;
-    }
-    return 0;
-}
-
-#endif
-
-#include <cassert>
-#include <cstdio>
 #include <iomanip>
 #include <iostream>
 #include <sstream>
 
 #include "misc.h"
+#include "thread.h"
+
+#if defined(__hpux)
+#    include <sys/pstat.h>
+#endif
 
 using namespace std;
 
-/// Version number. If this is left empty, the current date (in the format
+/// Version number. If Version is left empty, then Tag plus current
-/// YYMMDD) is used as a version number.
+/// date (in the format YYMMDD) is used as a version number.
 
-static const string EngineVersion = "1.3rc1";
+static const string Version = "";
-static const string AppName = "Stockfish";
+static const string Tag = "";
-static const string AppTag  = "";
 
 
-////
+/// engine_info() returns the full name of the current Stockfish version.
-//// Variables
+/// This will be either "Stockfish YYMMDD" (where YYMMDD is the date when
-////
+/// the program was compiled) or "Stockfish <version number>", depending
+/// on whether Version is empty.
 
-long dbg_cnt0 = 0;
+const string engine_info(bool to_uci) {
-long dbg_cnt1 = 0;
 
-bool dbg_show_mean = false;
+  const string months("Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec");
-bool dbg_show_hit_rate = false;
+  const string cpu64(Is64Bit ? " 64bit" : "");
+  const string popcnt(HasPopCnt ? " SSE4.2" : "");
 
+  string month, day, year;
+  stringstream s, date(__DATE__); // From compiler, format is "Sep 21 2008"
 
-////
+  s << "Stockfish " << Version;
-//// Functions
-////
 
-void dbg_hit_on(bool b) {
+  if (Version.empty())
+  {
+      date >> month >> day >> year;
 
-    assert(!dbg_show_mean);
+      s << Tag << setfill('0') << " " << year.substr(2)
-    dbg_show_hit_rate = true;
+        << setw(2) << (1 + months.find(month) / 4) << setw(2) << day;
-    dbg_cnt0++;
-    if (b)
-        dbg_cnt1++;
   }
 
-void dbg_hit_on_c(bool c, bool b) {
+  s << cpu64 << popcnt << (to_uci ? "\nid author ": " by ")
-
+    << "Tord Romstad, Marco Costalba and Joona Kiiski";
-    if (c)
-        dbg_hit_on(b);
-}
-
-void dbg_before() {
-
-    assert(!dbg_show_mean);
-    dbg_show_hit_rate = true;
-    dbg_cnt0++;
-}
-
-void dbg_after() {
-
-    assert(!dbg_show_mean);
-    dbg_show_hit_rate = true;
-    dbg_cnt1++;
-}
-
-void dbg_mean_of(int v) {
-
-    assert(!dbg_show_hit_rate);
-    dbg_show_mean = true;
-    dbg_cnt0++;
-    dbg_cnt1 += v;
-}
-
-void dbg_print_hit_rate() {
-
-  cout << "Total " << dbg_cnt0 << " Hit " << dbg_cnt1
-       << " hit rate (%) " << (dbg_cnt1*100)/(dbg_cnt0 ? dbg_cnt0 : 1) << endl;
-}
-
-void dbg_print_mean() {
-
-  cout << "Total " << dbg_cnt0 << " Mean "
-       << (float)dbg_cnt1 / (dbg_cnt0 ? dbg_cnt0 : 1) << endl;
-}
-
-void dbg_print_hit_rate(ofstream& logFile) {
-
-  logFile << "Total " << dbg_cnt0 << " Hit " << dbg_cnt1
-          << " hit rate (%) " << (dbg_cnt1*100)/(dbg_cnt0 ? dbg_cnt0 : 1) << endl;
-}
-
-void dbg_print_mean(ofstream& logFile) {
-
-  logFile << "Total " << dbg_cnt0 << " Mean "
-          << (float)dbg_cnt1 / (dbg_cnt0 ? dbg_cnt0 : 1) << endl;
-}
-
-/// engine_name() returns the full name of the current Stockfish version.
-/// This will be either "Stockfish YYMMDD" (where YYMMDD is the date when the
-/// program was compiled) or "Stockfish <version number>", depending on whether
-/// the constant EngineVersion (defined in misc.h) is empty.
-
-const string engine_name() {
-
-  if (!EngineVersion.empty())
-      return "Stockfish " + EngineVersion;
-
-  string date(__DATE__); // From compiler, format is "Sep 21 2008"
-  string months("Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec");
-
-  size_t mon = 1 + months.find(date.substr(0, 3)) / 4;
-
-  stringstream s;
-  string day = (date[4] == ' ' ? date.substr(5, 1) : date.substr(4, 2));
-
-  string name = AppName + " " + AppTag + " ";
-
-  s << name << date.substr(date.length() - 2) << setfill('0')
-    << setw(2) << mon << setw(2) << day;
 
   return s.str();
 }
 
 
-/// get_system_time() returns the current system time, measured in
+/// Convert system time to milliseconds. That's all we need.
-/// milliseconds.
 
-int get_system_time() {
+Time::point Time::now() {
-  struct timeval t;
+  sys_time_t t; system_time(&t); return time_to_msec(t);
-  gettimeofday(&t, NULL);
-  return t.tv_sec*1000 + t.tv_usec/1000;
 }
 
 
-/// cpu_count() tries to detect the number of CPU cores.
+/// Debug functions used mainly to collect run-time statistics
 
-#if !defined(_MSC_VER)
+static uint64_t hits[2], means[2];
 
-#  if defined(_SC_NPROCESSORS_ONLN)
+void dbg_hit_on(bool b) { hits[0]++; if (b) hits[1]++; }
-int cpu_count() {
+void dbg_hit_on_c(bool c, bool b) { if (c) dbg_hit_on(b); }
-  return Min(sysconf(_SC_NPROCESSORS_ONLN), 8);
+void dbg_mean_of(int v) { means[0]++; means[1] += v; }
+
+void dbg_print() {
+
+  if (hits[0])
+      cerr << "Total " << hits[0] << " Hits " << hits[1]
+           << " hit rate (%) " << 100 * hits[1] / hits[0] << endl;
+
+  if (means[0])
+      cerr << "Total " << means[0] << " Mean "
+           << (float)means[1] / means[0] << endl;
 }
-#  else
+
-int cpu_count() {
+
-  return 1;
+/// Our fancy logging facility. The trick here is to replace cin.rdbuf() and
+/// cout.rdbuf() with two Tie objects that tie cin and cout to a file stream. We
+/// can toggle the logging of std::cout and std:cin at runtime while preserving
+/// usual i/o functionality and without changing a single line of code!
+/// Idea from http://groups.google.com/group/comp.lang.c++/msg/1d941c0f26ea0d81
+
+struct Tie: public streambuf { // MSVC requires splitted streambuf for cin and cout
+
+  Tie(streambuf* b, ofstream* f) : buf(b), file(f) {}
+
+  int sync() { return file->rdbuf()->pubsync(), buf->pubsync(); }
+  int overflow(int c) { return log(buf->sputc((char)c), "<< "); }
+  int underflow() { return buf->sgetc(); }
+  int uflow() { return log(buf->sbumpc(), ">> "); }
+
+  streambuf* buf;
+  ofstream* file;
+
+  int log(int c, const char* prefix) {
+
+    static int last = '\n';
+
+    if (last == '\n')
+        file->rdbuf()->sputn(prefix, 3);
+
+    return last = file->rdbuf()->sputc((char)c);
   }
-#  endif
+};
 
-#else
+class Logger {
+
+  Logger() : in(cin.rdbuf(), &file), out(cout.rdbuf(), &file) {}
+ ~Logger() { start(false); }
+
+  ofstream file;
+  Tie in, out;
+
+public:
+  static void start(bool b) {
+
+    static Logger l;
+
+    if (b && !l.file.is_open())
+    {
+        l.file.open("io_log.txt", ifstream::out | ifstream::app);
+        cin.rdbuf(&l.in);
+        cout.rdbuf(&l.out);
+    }
+    else if (!b && l.file.is_open())
+    {
+        cout.rdbuf(l.out.buf);
+        cin.rdbuf(l.in.buf);
+        l.file.close();
+    }
+  }
+};
+
+
+/// Used to serialize access to std::cout to avoid multiple threads to write at
+/// the same time.
+
+std::ostream& operator<<(std::ostream& os, SyncCout sc) {
+
+  static Mutex m;
+
+  if (sc == io_lock)
+      m.lock();
+
+  if (sc == io_unlock)
+      m.unlock();
+
+  return os;
+}
+
+
+/// Trampoline helper to avoid moving Logger to misc.h
+void start_logger(bool b) { Logger::start(b); }
+
+
+/// cpu_count() tries to detect the number of CPU cores
 
 int cpu_count() {
+
+#if defined(_WIN32) || defined(_WIN64)
   SYSTEM_INFO s;
   GetSystemInfo(&s);
-  return Min(s.dwNumberOfProcessors, 8);
+  return s.dwNumberOfProcessors;
-}
+#else
 
+#  if defined(_SC_NPROCESSORS_ONLN)
+  return sysconf(_SC_NPROCESSORS_ONLN);
+#  elif defined(__hpux)
+  struct pst_dynamic psd;
+  if (pstat_getdynamic(&psd, sizeof(psd), (size_t)1, 0) == -1)
+      return 1;
+  return psd.psd_proc_cnt;
+#  else
+  return 1;
 #  endif
 
-
+#endif
-/*
-  From Beowulf, from Olithink
-*/
-#ifndef _WIN32
-/* Non-windows version */
-int Bioskey()
-{
-  fd_set          readfds;
-  struct timeval  timeout;
-
-  FD_ZERO(&readfds);
-  FD_SET(fileno(stdin), &readfds);
-  /* Set to timeout immediately */
-  timeout.tv_sec = 0;
-  timeout.tv_usec = 0;
-  select(16, &readfds, 0, 0, &timeout);
-
-  return (FD_ISSET(fileno(stdin), &readfds));
 }
 
+
+/// timed_wait() waits for msec milliseconds. It is mainly an helper to wrap
+/// conversion from milliseconds to struct timespec, as used by pthreads.
+
+void timed_wait(WaitCondition& sleepCond, Lock& sleepLock, int msec) {
+
+#if defined(_WIN32) || defined(_WIN64)
+  int tm = msec;
+#else
+  timespec ts, *tm = &ts;
+  uint64_t ms = Time::now() + msec;
+
+  ts.tv_sec = ms / 1000;
+  ts.tv_nsec = (ms % 1000) * 1000000LL;
+#endif
+
+  cond_timedwait(sleepCond, sleepLock, tm);
+}
+
+
+/// prefetch() preloads the given address in L1/L2 cache. This is a non
+/// blocking function and do not stalls the CPU waiting for data to be
+/// loaded from memory, that can be quite slow.
+#if defined(NO_PREFETCH)
+
+void prefetch(char*) {}
+
 #else
-/* Windows-version */
-#include <windows.h>
-#include <conio.h>
-int Bioskey()
-{
-    static int      init = 0,
-                    pipe;
-    static HANDLE   inh;
-    DWORD           dw;
-    /* If we're running under XBoard then we can't use _kbhit() as the input
-     * commands are sent to us directly over the internal pipe */
 
-#if defined(FILE_CNT)
+#   include <xmmintrin.h>
-    if (stdin->_cnt > 0)
+
-        return stdin->_cnt;
+void prefetch(char* addr) {
+
+#  if defined(__INTEL_COMPILER) || defined(__ICL)
+   // This hack prevents prefetches to be optimized away by
+   // Intel compiler. Both MSVC and gcc seems not affected.
+   __asm__ ("");
 #  endif
-    if (!init) {
-        init = 1;
-        inh = GetStdHandle(STD_INPUT_HANDLE);
-        pipe = !GetConsoleMode(inh, &dw);
-        if (!pipe) {
-            SetConsoleMode(inh, dw & ~(ENABLE_MOUSE_INPUT | ENABLE_WINDOW_INPUT));
-            FlushConsoleInputBuffer(inh);
-        }
-    }
-    if (pipe) {
-        if (!PeekNamedPipe(inh, NULL, 0, NULL, &dw, NULL))
-            return 1;
-        return dw;
-    } else {
-        // Count the number of unread input records, including keyboard,
-        // mouse, and window-resizing input records.
-        GetNumberOfConsoleInputEvents(inh, &dw);
-        if (dw <= 0)
-            return 0;
 
-        // Read data from console without removing it from the buffer
+  _mm_prefetch(addr, _MM_HINT_T2);
-        INPUT_RECORD rec[256];
+  _mm_prefetch(addr+64, _MM_HINT_T2); // 64 bytes ahead
-        DWORD recCnt;
-        if (!PeekConsoleInput(inh, rec, Min(dw, 256), &recCnt))
-            return 0;
-
-        // Search for at least one keyboard event
-        for (DWORD i = 0; i < recCnt; i++)
-            if (rec[i].EventType == KEY_EVENT)
-                return 1;
-
-        return 0;
-    }
 }
+
 #endif

src/misc.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,54 +17,53 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(MISC_H_INCLUDED)
 #define MISC_H_INCLUDED
 
-
-////
-//// Includes
-////
-
 #include <fstream>
 #include <string>
+#include <vector>
 
+#include "types.h"
 
-////
+extern const std::string engine_info(bool to_uci = false);
-//// Macros
-////
-
-#define Min(x, y) (((x) < (y))? (x) : (y))
-#define Max(x, y) (((x) < (y))? (y) : (x))
-
-
-////
-//// Prototypes
-////
-
-extern const std::string engine_name();
-extern int get_system_time();
 extern int cpu_count();
-extern int Bioskey();
+extern void timed_wait(WaitCondition&, Lock&, int);
-
+extern void prefetch(char* addr);
-////
+extern void start_logger(bool b);
-//// Debug
-////
-
-extern bool dbg_show_mean;
-extern bool dbg_show_hit_rate;
-
-extern long dbg_cnt0;
-extern long dbg_cnt1;
 
 extern void dbg_hit_on(bool b);
 extern void dbg_hit_on_c(bool c, bool b);
-extern void dbg_before();
-extern void dbg_after();
 extern void dbg_mean_of(int v);
-extern void dbg_print_hit_rate();
+extern void dbg_print();
-extern void dbg_print_mean();
+
-extern void dbg_print_hit_rate(std::ofstream& logFile);
+
-extern void dbg_print_mean(std::ofstream& logFile);
+struct Log : public std::ofstream {
+  Log(const std::string& f = "log.txt") : std::ofstream(f.c_str(), std::ios::out | std::ios::app) {}
+ ~Log() { if (is_open()) close(); }
+};
+
+
+namespace Time {
+  typedef int64_t point;
+  point now();
+}
+
+
+template<class Entry, int Size>
+struct HashTable {
+  HashTable() : e(Size, Entry()) {}
+  Entry* operator[](Key k) { return &e[(uint32_t)k & (Size - 1)]; }
+
+private:
+  std::vector<Entry> e;
+};
+
+
+enum SyncCout { io_lock, io_unlock };
+std::ostream& operator<<(std::ostream&, SyncCout);
+
+#define sync_cout std::cout << io_lock
+#define sync_endl std::endl << io_unlock
 
 #endif // !defined(MISC_H_INCLUDED)

src/move.cpp

@@ -1,153 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-////
-//// Includes
-////
-
-#include <cassert>
-
-#include "move.h"
-#include "piece.h"
-#include "position.h"
-#include "ucioption.h"
-
-
-////
-//// Functions
-////
-
-/// move_from_string() takes a position and a string as input, and attempts to
-/// convert the string to a move, using simple coordinate notation (g1f3,
-/// a7a8q, etc.). In order to correctly parse en passant captures and castling
-/// moves, we need the position. This function is not robust, and expects that
-/// the input move is legal and correctly formatted.
-
-Move move_from_string(const Position& pos, const std::string& str) {
-
-  Square from, to;
-  Piece piece;
-  Color us = pos.side_to_move();
-
-  if (str.length() < 4)
-      return MOVE_NONE;
-
-  // Read the from and to squares
-  from = square_from_string(str.substr(0, 2));
-  to = square_from_string(str.substr(2, 4));
-
-  // Find the moving piece
-  piece = pos.piece_on(from);
-
-  // If the string has more than 4 characters, try to interpret the 5th
-  // character as a promotion
-  if (type_of_piece(piece) == PAWN && str.length() > 4)
-  {
-      switch (tolower(str[4])) {
-      case 'n':
-          return make_promotion_move(from, to, KNIGHT);
-      case 'b':
-          return make_promotion_move(from, to, BISHOP);
-      case 'r':
-          return make_promotion_move(from, to, ROOK);
-      case 'q':
-          return make_promotion_move(from, to, QUEEN);
-    }
-  }
-
-  if (piece == piece_of_color_and_type(us, KING))
-  {
-      // Is this a castling move? A king move is assumed to be a castling
-      // move if the destination square is occupied by a friendly rook, or
-      // if the distance between the source and destination squares is more
-      // than 1.
-      if (pos.piece_on(to) == piece_of_color_and_type(us, ROOK))
-          return make_castle_move(from, to);
-
-      else if (square_distance(from, to) > 1)
-      {
-          // This is a castling move, but we have to translate it to the
-          // internal "king captures rook" representation.
-          SquareDelta delta = (to > from ? DELTA_E : DELTA_W);
-          Square s = from + delta;
-          while (relative_rank(us, s) == RANK_1 && pos.piece_on(s) != piece_of_color_and_type(us, ROOK))
-              s += delta;
-
-          return (relative_rank(us, s) == RANK_1 ? make_castle_move(from, s) : MOVE_NONE);
-      }
-  }
-  else if (piece == piece_of_color_and_type(us, PAWN))
-  {
-      // En passant move? We assume that a pawn move is an en passant move
-      // without further testing if the destination square is epSquare.
-      if (to == pos.ep_square())
-          return make_ep_move(from, to);
-  }
-  return make_move(from, to);
-}
-
-
-/// move_to_string() converts a move to a string in coordinate notation
-/// (g1f3, a7a8q, etc.).  The only special case is castling moves, where we
-/// print in the e1g1 notation in normal chess mode, and in e1h1 notation in
-/// Chess960 mode.
-
-const std::string move_to_string(Move move) {
-
-  std::string str;
-  Square from = move_from(move);
-  Square to = move_to(move);
-
-  if (move == MOVE_NONE)
-      str = "(none)";
-  else if (move == MOVE_NULL)
-      str = "0000";
-  else
-  {
-      if (!Chess960)
-      {
-          if (move_is_short_castle(move))
-              return (from == SQ_E1 ? "e1g1" : "e8g8");
-
-          if (move_is_long_castle(move))
-              return (from == SQ_E1 ? "e1c1" : "e8c8");
-      }
-      str = square_to_string(from) + square_to_string(to);
-      if (move_promotion(move))
-          str += piece_type_to_char(move_promotion(move), false);
-  }
-  return str;
-}
-
-
-/// Overload the << operator, to make it easier to print moves.
-
-std::ostream &operator << (std::ostream& os, Move m) {
-
-  return os << move_to_string(m);
-}
-
-
-/// move_is_ok(), for debugging.
-
-bool move_is_ok(Move m) {
-
-  return square_is_ok(move_from(m)) && square_is_ok(move_to(m));
-}

src/move.h

@@ -1,125 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(MOVE_H_INCLUDED)
-#define MOVE_H_INCLUDED
-
-////
-//// Includes
-////
-
-#include <iostream>
-
-#include "misc.h"
-#include "piece.h"
-#include "square.h"
-
-
-////
-//// Types
-////
-
-class Position;
-
-/// A move needs 17 bits to be stored
-///
-/// bit  0- 5: destination square (from 0 to 63)
-/// bit  6-11: origin square (from 0 to 63)
-/// bit 12-14: promotion piece type
-/// bit    15: en passant flag
-/// bit    16: castle flag
-///
-/// Special cases are MOVE_NONE and MOVE_NULL. We can sneak these in
-/// because in any normal move destination square is always different
-/// from origin square while MOVE_NONE and MOVE_NULL have the same
-/// origin and destination square, 0 and 1 respectively.
-
-enum Move {
-  MOVE_NONE = 0,
-  MOVE_NULL = 65
-};
-
-
-struct MoveStack {
-  Move move;
-  int score;
-};
-
-
-////
-//// Inline functions
-////
-
-inline Square move_from(Move m) {
-  return Square((int(m) >> 6) & 0x3F);
-}
-
-inline Square move_to(Move m) {
-  return Square(m & 0x3F);
-}
-
-inline PieceType move_promotion(Move m) {
-  return PieceType((int(m) >> 12) & 7);
-}
-
-inline bool move_is_ep(Move m) {
-  return bool((int(m) >> 15) & 1);
-}
-
-inline bool move_is_castle(Move m) {
-  return bool((int(m) >> 16) & 1);
-}
-
-inline bool move_is_short_castle(Move m) {
-  return move_is_castle(m) && (move_to(m) > move_from(m));
-}
-
-inline bool move_is_long_castle(Move m) {
-  return move_is_castle(m) && (move_to(m) < move_from(m));
-}
-
-inline Move make_promotion_move(Square from, Square to, PieceType promotion) {
-  return Move(int(to) | (int(from) << 6) | (int(promotion) << 12));
-}
-
-inline Move make_move(Square from, Square to) {
-  return Move(int(to) | (int(from) << 6));
-}
-
-inline Move make_castle_move(Square from, Square to) {
-  return Move(int(to) | (int(from) << 6) | (1 << 16));
-}
-
-inline Move make_ep_move(Square from, Square to) {
-  return Move(int(to) | (int(from) << 6) | (1 << 15));
-}
-
-
-////
-//// Prototypes
-////
-
-extern std::ostream &operator << (std::ostream &os, Move m);
-extern Move move_from_string(const Position &pos, const std::string &str);
-extern const std::string move_to_string(Move m);
-extern bool move_is_ok(Move m);
-
-
-#endif // !defined(MOVE_H_INCLUDED)

src/movegen.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,27 +17,39 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(MOVEGEN_H_INCLUDED)
 #define MOVEGEN_H_INCLUDED
 
-////
+#include "types.h"
-//// Includes
-////
 
-#include "position.h"
+enum GenType {
+  CAPTURES,
+  QUIETS,
+  QUIET_CHECKS,
+  EVASIONS,
+  NON_EVASIONS,
+  LEGAL
+};
 
+class Position;
 
-////
+template<GenType>
-//// Prototypes
+MoveStack* generate(const Position& pos, MoveStack* mlist);
-////
 
-extern int generate_captures(const Position& pos, MoveStack* mlist);
+/// The MoveList struct is a simple wrapper around generate(), sometimes comes
-extern int generate_noncaptures(const Position& pos, MoveStack* mlist);
+/// handy to use this class instead of the low level generate() function.
-extern int generate_non_capture_checks(const Position& pos, MoveStack* mlist, Bitboard dc);
+template<GenType T>
-extern int generate_evasions(const Position& pos, MoveStack* mlist, Bitboard pinned);
+struct MoveList {
-extern int generate_legal_moves(const Position& pos, MoveStack* mlist);
-extern bool move_is_legal(const Position& pos, const Move m, Bitboard pinned);
 
+  explicit MoveList(const Position& pos) : cur(mlist), last(generate<T>(pos, mlist)) {}
+  void operator++() { cur++; }
+  bool end() const { return cur == last; }
+  Move move() const { return cur->move; }
+  size_t size() const { return last - mlist; }
+
+private:
+  MoveStack mlist[MAX_MOVES];
+  MoveStack *cur, *last;
+};
 
 #endif // !defined(MOVEGEN_H_INCLUDED)

src/movepick.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -18,190 +18,133 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
+#include <algorithm>
-////
-//// Includes
-////
-
 #include <cassert>
 
-#include "history.h"
-#include "evaluate.h"
 #include "movegen.h"
 #include "movepick.h"
-#include "search.h"
+#include "thread.h"
-#include "value.h"
-
-
-////
-//// Local definitions
-////
 
 namespace {
 
-  /// Variables
+  enum Sequencer {
+    MAIN_SEARCH, CAPTURES_S1, KILLERS_S1, QUIETS_1_S1, QUIETS_2_S1, BAD_CAPTURES_S1,
+    EVASION,     EVASIONS_S2,
+    QSEARCH_0,   CAPTURES_S3, QUIET_CHECKS_S3,
+    QSEARCH_1,   CAPTURES_S4,
+    PROBCUT,     CAPTURES_S5,
+    RECAPTURE,   CAPTURES_S6,
+    STOP
+  };
 
-  MovePicker::MovegenPhase PhaseTable[32];
+  // Unary predicate used by std::partition to split positive scores from remaining
-  int MainSearchPhaseIndex;
+  // ones so to sort separately the two sets, and with the second sort delayed.
-  int EvasionsPhaseIndex;
+  inline bool has_positive_score(const MoveStack& ms) { return ms.score > 0; }
-  int QsearchWithChecksPhaseIndex;
-  int QsearchWithoutChecksPhaseIndex;
 
+  // Picks and moves to the front the best move in the range [begin, end),
+  // it is faster than sorting all the moves in advance when moves are few, as
+  // normally are the possible captures.
+  inline MoveStack* pick_best(MoveStack* begin, MoveStack* end)
+  {
+      std::swap(*begin, *std::max_element(begin, end));
+      return begin;
+  }
 }
 
 
-////
+/// Constructors of the MovePicker class. As arguments we pass information
-//// Functions
-////
-
-
-/// Constructor for the MovePicker class.  Apart from the position for which
-/// it is asked to pick legal moves, MovePicker also wants some information
 /// to help it to return the presumably good moves first, to decide which
 /// moves to return (in the quiescence search, for instance, we only want to
 /// search captures, promotions and some checks) and about how important good
 /// move ordering is at the current node.
 
-MovePicker::MovePicker(const Position& p, bool pv, Move ttm,
+MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const History& h,
-                       const SearchStack& ss, Depth d) : pos(p) {
+                       Search::Stack* s, Value beta) : pos(p), H(h), depth(d) {
-  pvNode = pv;
+
-  ttMove = ttm;
+  assert(d > DEPTH_ZERO);
-  mateKiller = (ss.mateKiller == ttm)? MOVE_NONE : ss.mateKiller;
+
-  killer1 = ss.killers[0];
+  captureThreshold = 0;
-  killer2 = ss.killers[1];
+  cur = end = moves;
-  depth = d;
+  endBadCaptures = moves + MAX_MOVES - 1;
-  movesPicked = 0;
+  ss = s;
-  numOfMoves = 0;
+
-  numOfBadCaptures = 0;
+  if (p.in_check())
+      phase = EVASION;
 
-  if (p.is_check())
-      phaseIndex = EvasionsPhaseIndex;
-  else if (depth > Depth(0))
-      phaseIndex = MainSearchPhaseIndex;
-  else if (depth == Depth(0))
-      phaseIndex = QsearchWithChecksPhaseIndex;
   else
-      phaseIndex = QsearchWithoutChecksPhaseIndex;
-
-  Color us = pos.side_to_move();
-
-  dc = p.discovered_check_candidates(us);
-  pinned = p.pinned_pieces(us);
-
-  finished = false;
-}
-
-
-/// MovePicker::get_next_move() is the most important method of the MovePicker
-/// class.  It returns a new legal move every time it is called, until there
-/// are no more moves left of the types we are interested in.
-
-Move MovePicker::get_next_move() {
-
-  Move move;
-
-  while (true)
   {
-    // If we already have a list of generated moves, pick the best move from
+      phase = MAIN_SEARCH;
-    // the list, and return it.
+
-    move = pick_move_from_list();
+      killers[0].move = ss->killers[0];
-    if (move != MOVE_NONE)
+      killers[1].move = ss->killers[1];
+
+      // Consider sligtly negative captures as good if at low depth and far from beta
+      if (ss && ss->eval < beta - PawnValueMg && d < 3 * ONE_PLY)
+          captureThreshold = -PawnValueMg;
+
+      // Consider negative captures as good if still enough to reach beta
+      else if (ss && ss->eval > beta)
+          captureThreshold = beta - ss->eval;
+  }
+
+  ttMove = (ttm && pos.is_pseudo_legal(ttm) ? ttm : MOVE_NONE);
+  end += (ttMove != MOVE_NONE);
+}
+
+MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const History& h,
+                       Square sq) : pos(p), H(h), cur(moves), end(moves) {
+
+  assert(d <= DEPTH_ZERO);
+
+  if (p.in_check())
+      phase = EVASION;
+
+  else if (d > DEPTH_QS_NO_CHECKS)
+      phase = QSEARCH_0;
+
+  else if (d > DEPTH_QS_RECAPTURES)
   {
-        assert(move_is_ok(move));
+      phase = QSEARCH_1;
-        return move;
+
+      // Skip TT move if is not a capture or a promotion, this avoids qsearch
+      // tree explosion due to a possible perpetual check or similar rare cases
+      // when TT table is full.
+      if (ttm && !pos.is_capture_or_promotion(ttm))
+          ttm = MOVE_NONE;
   }
-
+  else
-    // Next phase
-    phaseIndex++;
-    switch (PhaseTable[phaseIndex]) {
-
-    case PH_TT_MOVE:
-        if (ttMove != MOVE_NONE)
   {
-            assert(move_is_ok(ttMove));
+      phase = RECAPTURE;
-            if (move_is_legal(pos, ttMove, pinned))
+      recaptureSquare = sq;
-                return ttMove;
+      ttm = MOVE_NONE;
   }
-        break;
 
-    case PH_MATE_KILLER:
+  ttMove = (ttm && pos.is_pseudo_legal(ttm) ? ttm : MOVE_NONE);
-        if (mateKiller != MOVE_NONE)
+  end += (ttMove != MOVE_NONE);
-        {
-            assert(move_is_ok(mateKiller));
-            if (move_is_legal(pos, mateKiller, pinned))
-                return mateKiller;
 }
-        break;
 
-    case PH_GOOD_CAPTURES:
+MovePicker::MovePicker(const Position& p, Move ttm, const History& h, PieceType pt)
-        numOfMoves = generate_captures(pos, moves);
+                       : pos(p), H(h), cur(moves), end(moves) {
-        score_captures();
-        movesPicked = 0;
-        break;
 
-    case PH_BAD_CAPTURES:
+  assert(!pos.in_check());
-        movesPicked = 0;
-        break;
 
-    case PH_NONCAPTURES:
+  phase = PROBCUT;
-        numOfMoves = generate_noncaptures(pos, moves);
-        score_noncaptures();
-        movesPicked = 0;
-        break;
 
-    case PH_EVASIONS:
+  // In ProbCut we generate only captures better than parent's captured piece
-        assert(pos.is_check());
+  captureThreshold = PieceValue[Mg][pt];
-        numOfMoves = generate_evasions(pos, moves, pinned);
+  ttMove = (ttm && pos.is_pseudo_legal(ttm) ? ttm : MOVE_NONE);
-        score_evasions();
-        movesPicked = 0;
-        break;
 
-    case PH_QCAPTURES:
+  if (ttMove && (!pos.is_capture(ttMove) ||  pos.see(ttMove) <= captureThreshold))
-        numOfMoves = generate_captures(pos, moves);
+      ttMove = MOVE_NONE;
-        score_qcaptures();
-        movesPicked = 0;
-        break;
 
-    case PH_QCHECKS:
+  end += (ttMove != MOVE_NONE);
-        numOfMoves = generate_non_capture_checks(pos, moves, dc);
-        movesPicked = 0;
-        break;
-
-    case PH_STOP:
-        return MOVE_NONE;
-
-    default:
-        assert(false);
-        return MOVE_NONE;
-    }
-  }
 }
 
 
-/// A variant of get_next_move() which takes a lock as a parameter, used to
+/// MovePicker::score_captures(), MovePicker::score_noncaptures() and
-/// prevent multiple threads from picking the same move at a split point.
+/// MovePicker::score_evasions() assign a numerical move ordering score
-
+/// to each move in a move list.  The moves with highest scores will be
-Move MovePicker::get_next_move(Lock &lock) {
+/// picked first by next_move().
-
-   lock_grab(&lock);
-   if (finished)
-   {
-       lock_release(&lock);
-       return MOVE_NONE;
-   }
-   Move m = get_next_move();
-   if (m == MOVE_NONE)
-       finished = true;
-
-   lock_release(&lock);
-   return m;
-}
-
-
-/// MovePicker::score_captures(), MovePicker::score_noncaptures(),
-/// MovePicker::score_evasions() and MovePicker::score_qcaptures() assign a
-/// numerical move ordering score to each move in a move list.  The moves
-/// with highest scores will be picked first by pick_move_from_list().
 
 void MovePicker::score_captures() {
   // Winning and equal captures in the main search are ordered by MVV/LVA.
@@ -213,260 +156,209 @@ void MovePicker::score_captures() {
   // where it is possible to recapture with the hanging piece). Exchanging
   // big pieces before capturing a hanging piece probably helps to reduce
   // the subtree size.
-  // While scoring captures it moves all captures with negative SEE values
+  // In main search we want to push captures with negative SEE values to
-  // to the badCaptures[] array.
+  // badCaptures[] array, but instead of doing it now we delay till when
+  // the move has been picked up in pick_move_from_list(), this way we save
+  // some SEE calls in case we get a cutoff (idea from Pablo Vazquez).
   Move m;
-  int seeValue;
 
-  for (int i = 0; i < numOfMoves; i++)
+  for (MoveStack* it = moves; it != end; ++it)
   {
-      m = moves[i].move;
+      m = it->move;
-      seeValue = pos.see(m);
+      it->score =  PieceValue[Mg][pos.piece_on(to_sq(m))]
-      if (seeValue >= 0)
+                 - type_of(pos.piece_moved(m));
-      {
+
-          if (move_promotion(m))
+      if (type_of(m) == PROMOTION)
-              moves[i].score = QueenValueMidgame;
+          it->score += PieceValue[Mg][promotion_type(m)];
-          else
-              moves[i].score = int(pos.midgame_value_of_piece_on(move_to(m)))
-                              -int(pos.type_of_piece_on(move_from(m)));
-      }
-      else
-      {
-          // Losing capture, move it to the badCaptures[] array
-          assert(numOfBadCaptures < 63);
-          moves[i].score = seeValue;
-          badCaptures[numOfBadCaptures++] = moves[i];
-          moves[i--] = moves[--numOfMoves];
-      }
   }
 }
 
 void MovePicker::score_noncaptures() {
-  // First score by history, when no history is available then use
+
-  // piece/square tables values. This seems to be better then a
-  // random choice when we don't have an history for any move.
   Move m;
-  int hs;
 
-  for (int i = 0; i < numOfMoves; i++)
+  for (MoveStack* it = moves; it != end; ++it)
   {
-      m = moves[i].move;
+      m = it->move;
-
+      it->score = H.value(pos.piece_moved(m), to_sq(m));
-      if (m == killer1)
-          hs = HistoryMax + 2;
-      else if (m == killer2)
-          hs = HistoryMax + 1;
-      else
-          hs = H.move_ordering_score(pos.piece_on(move_from(m)), m);
-
-      // Ensure history is always preferred to pst
-      if (hs > 0)
-          hs += 1000;
-
-      // pst based scoring
-      moves[i].score = hs + pos.mg_pst_delta(m);
   }
 }
 
 void MovePicker::score_evasions() {
+  // Try good captures ordered by MVV/LVA, then non-captures if destination square
+  // is not under attack, ordered by history value, then bad-captures and quiet
+  // moves with a negative SEE. This last group is ordered by the SEE score.
+  Move m;
+  int seeScore;
 
-  for (int i = 0; i < numOfMoves; i++)
+  if (end < moves + 2)
-  {
+      return;
-      Move m = moves[i].move;
-      if (m == ttMove)
-          moves[i].score = 2*HistoryMax;
-      else if (!pos.square_is_empty(move_to(m)))
-      {
-          int seeScore = pos.see(m);
-          moves[i].score = (seeScore >= 0)? seeScore + HistoryMax : seeScore;
-      } else
-          moves[i].score = H.move_ordering_score(pos.piece_on(move_from(m)), m);
-  }
-}
 
-void MovePicker::score_qcaptures() {
+  for (MoveStack* it = moves; it != end; ++it)
-
-  // Use MVV/LVA ordering
-  for (int i = 0; i < numOfMoves; i++)
   {
-      Move m = moves[i].move;
+      m = it->move;
-      if (move_promotion(m))
+      if ((seeScore = pos.see_sign(m)) < 0)
-          moves[i].score = QueenValueMidgame;
+          it->score = seeScore - History::MaxValue; // Be sure we are at the bottom
+      else if (pos.is_capture(m))
+          it->score =  PieceValue[Mg][pos.piece_on(to_sq(m))]
+                     - type_of(pos.piece_moved(m)) + History::MaxValue;
       else
-          moves[i].score = int(pos.midgame_value_of_piece_on(move_to(m)))
+          it->score = H.value(pos.piece_moved(m), to_sq(m));
-                          -int(pos.type_of_piece_on(move_from(m)));
   }
 }
 
 
-/// find_best_index() loops across the moves and returns index of
+/// MovePicker::generate_next() generates, scores and sorts the next bunch of moves,
-/// the highest scored one.
+/// when there are no more moves to try for the current phase.
 
-int MovePicker::find_best_index() const {
+void MovePicker::generate_next() {
 
-  assert(movesPicked < numOfMoves);
+  cur = moves;
 
-  int bestIndex = movesPicked;
+  switch (++phase) {
-  int bestScore = moves[movesPicked].score;
 
-  for (int i = movesPicked + 1; i < numOfMoves; i++)
+  case CAPTURES_S1: case CAPTURES_S3: case CAPTURES_S4: case CAPTURES_S5: case CAPTURES_S6:
-      if (moves[i].score > bestScore)
+      end = generate<CAPTURES>(pos, moves);
-      {
+      score_captures();
-          bestIndex = i;
+      return;
-          bestScore = moves[i].score;
-      }
-  return bestIndex;
-}
 
+  case KILLERS_S1:
+      cur = killers;
+      end = cur + 2;
+      return;
 
-/// MovePicker::pick_move_from_list() picks the move with the biggest score
+  case QUIETS_1_S1:
-/// from a list of generated moves (moves[] or badCaptures[], depending on
+      endQuiets = end = generate<QUIETS>(pos, moves);
-/// the current move generation phase).  It takes care not to return the
+      score_noncaptures();
-/// transposition table move if that has already been serched previously.
+      end = std::partition(cur, end, has_positive_score);
+      sort<MoveStack>(cur, end);
+      return;
 
-Move MovePicker::pick_move_from_list() {
+  case QUIETS_2_S1:
+      cur = end;
+      end = endQuiets;
+      if (depth >= 3 * ONE_PLY)
+          sort<MoveStack>(cur, end);
+      return;
 
-  int bestIndex;
+  case BAD_CAPTURES_S1:
-  Move move;
+      // Just pick them in reverse order to get MVV/LVA ordering
+      cur = moves + MAX_MOVES - 1;
+      end = endBadCaptures;
+      return;
 
-  switch (PhaseTable[phaseIndex]) {
+  case EVASIONS_S2:
+      end = generate<EVASIONS>(pos, moves);
+      score_evasions();
+      return;
 
-  case PH_GOOD_CAPTURES:
+  case QUIET_CHECKS_S3:
-      assert(!pos.is_check());
+      end = generate<QUIET_CHECKS>(pos, moves);
-      assert(movesPicked >= 0);
+      return;
 
-      while (movesPicked < numOfMoves)
+  case EVASION: case QSEARCH_0: case QSEARCH_1: case PROBCUT: case RECAPTURE:
-      {
+      phase = STOP;
-          bestIndex = find_best_index();
+  case STOP:
-          move = moves[bestIndex].move;
+      end = cur + 1; // Avoid another next_phase() call
-          moves[bestIndex] = moves[movesPicked++];
+      return;
-          if (   move != ttMove
-              && move != mateKiller
-              && pos.pl_move_is_legal(move, pinned))
-              return move;
-      }
-      break;
-
-  case PH_NONCAPTURES:
-      assert(!pos.is_check());
-      assert(movesPicked >= 0);
-
-      while (movesPicked < numOfMoves)
-      {
-          // If this is a PV node or we have only picked a few moves, scan
-          // the entire move list for the best move.  If many moves have already
-          // been searched and it is not a PV node, we are probably failing low
-          // anyway, so we just pick the first move from the list.
-          bestIndex = (pvNode || movesPicked < 12) ? find_best_index() : movesPicked;
-          move = moves[bestIndex].move;
-          moves[bestIndex] = moves[movesPicked++];
-          if (   move != ttMove
-              && move != mateKiller
-              && pos.pl_move_is_legal(move, pinned))
-              return move;
-      }
-      break;
-
-  case PH_EVASIONS:
-      assert(pos.is_check());
-      assert(movesPicked >= 0);
-
-      while (movesPicked < numOfMoves)
-      {
-          bestIndex = find_best_index();
-          move = moves[bestIndex].move;
-          moves[bestIndex] = moves[movesPicked++];
-          return move;
-    }
-    break;
-
-  case PH_BAD_CAPTURES:
-      assert(!pos.is_check());
-      assert(movesPicked >= 0);
-      // It's probably a good idea to use SEE move ordering here, instead
-      // of just picking the first move.  FIXME
-      while (movesPicked < numOfBadCaptures)
-      {
-          move = badCaptures[movesPicked++].move;
-          if (   move != ttMove
-              && move != mateKiller
-              && pos.pl_move_is_legal(move, pinned))
-              return move;
-      }
-      break;
-
-  case PH_QCAPTURES:
-      assert(!pos.is_check());
-      assert(movesPicked >= 0);
-      while (movesPicked < numOfMoves)
-      {
-          bestIndex = (movesPicked < 4 ? find_best_index() : movesPicked);
-          move = moves[bestIndex].move;
-          moves[bestIndex] = moves[movesPicked++];
-          // Maybe postpone the legality check until after futility pruning?
-          if (   move != ttMove
-              && pos.pl_move_is_legal(move, pinned))
-              return move;
-      }
-      break;
-
-  case PH_QCHECKS:
-      assert(!pos.is_check());
-      assert(movesPicked >= 0);
-      // Perhaps we should do something better than just picking the first
-      // move here?  FIXME
-      while (movesPicked < numOfMoves)
-      {
-          move = moves[movesPicked++].move;
-          if (   move != ttMove
-              && pos.pl_move_is_legal(move, pinned))
-              return move;
-      }
-      break;
 
   default:
+      assert(false);
+  }
+}
+
+
+/// MovePicker::next_move() is the most important method of the MovePicker class.
+/// It returns a new pseudo legal move every time it is called, until there
+/// are no more moves left. It picks the move with the biggest score from a list
+/// of generated moves taking care not to return the tt move if has already been
+/// searched previously.
+template<>
+Move MovePicker::next_move<false>() {
+
+  Move move;
+
+  while (true)
+  {
+      while (cur == end)
+          generate_next();
+
+      switch (phase) {
+
+      case MAIN_SEARCH: case EVASION: case QSEARCH_0: case QSEARCH_1: case PROBCUT:
+          cur++;
+          return ttMove;
+
+      case CAPTURES_S1:
+          move = pick_best(cur++, end)->move;
+          if (move != ttMove)
+          {
+              assert(captureThreshold <= 0); // Otherwise we cannot use see_sign()
+
+              if (pos.see_sign(move) >= captureThreshold)
+                  return move;
+
+              // Losing capture, move it to the tail of the array
+              (endBadCaptures--)->move = move;
+          }
           break;
-  }
+
+      case KILLERS_S1:
+          move = (cur++)->move;
+          if (    move != MOVE_NONE
+              &&  pos.is_pseudo_legal(move)
+              &&  move != ttMove
+              && !pos.is_capture(move))
+              return move;
+          break;
+
+      case QUIETS_1_S1: case QUIETS_2_S1:
+          move = (cur++)->move;
+          if (   move != ttMove
+              && move != killers[0].move
+              && move != killers[1].move)
+              return move;
+          break;
+
+      case BAD_CAPTURES_S1:
+          return (cur--)->move;
+
+      case EVASIONS_S2: case CAPTURES_S3: case CAPTURES_S4:
+          move = pick_best(cur++, end)->move;
+          if (move != ttMove)
+              return move;
+          break;
+
+      case CAPTURES_S5:
+           move = pick_best(cur++, end)->move;
+           if (move != ttMove && pos.see(move) > captureThreshold)
+               return move;
+           break;
+
+      case CAPTURES_S6:
+          move = pick_best(cur++, end)->move;
+          if (to_sq(move) == recaptureSquare)
+              return move;
+          break;
+
+      case QUIET_CHECKS_S3:
+          move = (cur++)->move;
+          if (move != ttMove)
+              return move;
+          break;
+
+      case STOP:
           return MOVE_NONE;
+
+      default:
+          assert(false);
+      }
+  }
 }
 
 
-/// MovePicker::init_phase_table() initializes the PhaseTable[],
+/// Version of next_move() to use at split point nodes where the move is grabbed
-/// MainSearchPhaseIndex, EvasionPhaseIndex, QsearchWithChecksPhaseIndex
+/// from the split point's shared MovePicker object. This function is not thread
-/// and QsearchWithoutChecksPhaseIndex. It is only called once during
+/// safe so should be lock protected by the caller.
-/// program startup, and never again while the program is running.
+template<>
-
+Move MovePicker::next_move<true>() { return ss->sp->mp->next_move<false>(); }
-void MovePicker::init_phase_table() {
-
-  int i = 0;
-
-  // Main search
-  MainSearchPhaseIndex = i - 1;
-  PhaseTable[i++] = PH_TT_MOVE;
-  PhaseTable[i++] = PH_MATE_KILLER;
-  PhaseTable[i++] = PH_GOOD_CAPTURES;
-  // PH_KILLER_1 and PH_KILLER_2 are not yet used.
-  // PhaseTable[i++] = PH_KILLER_1;
-  // PhaseTable[i++] = PH_KILLER_2;
-  PhaseTable[i++] = PH_NONCAPTURES;
-  PhaseTable[i++] = PH_BAD_CAPTURES;
-  PhaseTable[i++] = PH_STOP;
-
-  // Check evasions
-  EvasionsPhaseIndex = i - 1;
-  PhaseTable[i++] = PH_EVASIONS;
-  PhaseTable[i++] = PH_STOP;
-
-  // Quiescence search with checks
-  QsearchWithChecksPhaseIndex = i - 1;
-  PhaseTable[i++] = PH_TT_MOVE;
-  PhaseTable[i++] = PH_QCAPTURES;
-  PhaseTable[i++] = PH_QCHECKS;
-  PhaseTable[i++] = PH_STOP;
-
-  // Quiescence search without checks
-  QsearchWithoutChecksPhaseIndex = i - 1;
-  PhaseTable[i++] = PH_TT_MOVE;
-  PhaseTable[i++] = PH_QCAPTURES;
-  PhaseTable[i++] = PH_STOP;
-}

src/movepick.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,103 +17,48 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined MOVEPICK_H_INCLUDED
 #define MOVEPICK_H_INCLUDED
 
-////
+#include "history.h"
-//// Includes
-////
-
-#include "depth.h"
-#include "lock.h"
 #include "position.h"
+#include "search.h"
+#include "types.h"
 
 
-////
+/// MovePicker class is used to pick one pseudo legal move at a time from the
-//// Types
+/// current position. The most important method is next_move(), which returns a
-////
+/// new pseudo legal move each time it is called, until there are no moves left,
-
+/// when MOVE_NONE is returned. In order to improve the efficiency of the alpha
-struct EvalInfo;
+/// beta algorithm, MovePicker attempts to return the moves which are most likely
-struct SearchStack;
+/// to get a cut-off first.
-
-/// MovePicker is a class which is used to pick one legal move at a time from
-/// the current position.  It is initialized with a Position object and a few
-/// moves we have reason to believe are good.  The most important method is
-/// MovePicker::pick_next_move(), which returns a new legal move each time it
-/// is called, until there are no legal moves left, when MOVE_NONE is returned.
-/// In order to improve the efficiency of the alpha beta algorithm, MovePicker
-/// attempts to return the moves which are most likely to be strongest first.
 
 class MovePicker {
 
   MovePicker& operator=(const MovePicker&); // Silence a warning under MSVC
 
 public:
-
+  MovePicker(const Position&, Move, Depth, const History&, Search::Stack*, Value);
-  enum MovegenPhase {
+  MovePicker(const Position&, Move, Depth, const History&, Square);
-    PH_TT_MOVE,        // Transposition table move
+  MovePicker(const Position&, Move, const History&, PieceType);
-    PH_MATE_KILLER,    // Mate killer from the current ply
+  template<bool SpNode> Move next_move();
-    PH_GOOD_CAPTURES,  // Queen promotions and captures with SEE values >= 0
-    PH_BAD_CAPTURES,   // Queen promotions and captures with SEE values < 0
-    PH_KILLER_1,       // Killer move 1 from the current ply (not used yet).
-    PH_KILLER_2,       // Killer move 2 from the current ply (not used yet).
-    PH_NONCAPTURES,    // Non-captures and underpromotions
-    PH_EVASIONS,       // Check evasions
-    PH_QCAPTURES,      // Captures in quiescence search
-    PH_QCHECKS,        // Checks in quiescence search
-    PH_STOP
-  };
-
-  MovePicker(const Position& p, bool pvnode, Move ttm, const SearchStack& ss, Depth d);
-  Move get_next_move();
-  Move get_next_move(Lock &lock);
-  int number_of_moves() const;
-  int current_move_score() const;
-  Bitboard discovered_check_candidates() const;
-
-  static void init_phase_table();
 
 private:
   void score_captures();
   void score_noncaptures();
   void score_evasions();
-  void score_qcaptures();
+  void generate_next();
-  Move pick_move_from_list();
-  int find_best_index() const;
 
   const Position& pos;
-  Move ttMove, mateKiller, killer1, killer2;
+  const History& H;
-  Bitboard pinned, dc;
+  Search::Stack* ss;
-  MoveStack moves[256], badCaptures[64];
-  bool pvNode;
   Depth depth;
-  int phaseIndex;
+  Move ttMove;
-  int numOfMoves, numOfBadCaptures;
+  MoveStack killers[2];
-  int movesPicked;
+  Square recaptureSquare;
-  bool finished;
+  int captureThreshold, phase;
+  MoveStack *cur, *end, *endQuiets, *endBadCaptures;
+  MoveStack moves[MAX_MOVES];
 };
 
-
-////
-//// Inline functions
-////
-
-/// MovePicker::number_of_moves() simply returns the numOfMoves member
-/// variable. It is intended to be used in positions where the side to move
-/// is in check, for detecting checkmates or situations where there is only
-/// a single reply to check.
-
-inline int MovePicker::number_of_moves() const {
-  return numOfMoves;
-}
-
-/// MovePicker::discovered_check_candidates() returns a bitboard containing
-/// all pieces which can possibly give discovered check.  This bitboard is
-/// computed by the constructor function.
-
-inline Bitboard MovePicker::discovered_check_candidates() const {
-  return dc;
-}
-
 #endif // !defined(MOVEPICK_H_INCLUDED)

src/notation.cpp

@@ -0,0 +1,271 @@
+/*
+  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
+  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
+
+  Stockfish is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  Stockfish is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <cassert>
+#include <iomanip>
+#include <sstream>
+#include <string>
+
+#include "movegen.h"
+#include "notation.h"
+#include "position.h"
+
+using namespace std;
+
+static const char* PieceToChar = " PNBRQK  pnbrqk";
+
+
+/// score_to_uci() converts a value to a string suitable for use with the UCI
+/// protocol specifications:
+///
+/// cp <x>     The score from the engine's point of view in centipawns.
+/// mate <y>   Mate in y moves, not plies. If the engine is getting mated
+///            use negative values for y.
+
+string score_to_uci(Value v, Value alpha, Value beta) {
+
+  stringstream s;
+
+  if (abs(v) < VALUE_MATE_IN_MAX_PLY)
+      s << "cp " << v * 100 / int(PawnValueMg);
+  else
+      s << "mate " << (v > 0 ? VALUE_MATE - v + 1 : -VALUE_MATE - v) / 2;
+
+  s << (v >= beta ? " lowerbound" : v <= alpha ? " upperbound" : "");
+
+  return s.str();
+}
+
+
+/// move_to_uci() converts a move to a string in coordinate notation
+/// (g1f3, a7a8q, etc.). The only special case is castling moves, where we print
+/// in the e1g1 notation in normal chess mode, and in e1h1 notation in chess960
+/// mode. Internally castle moves are always coded as "king captures rook".
+
+const string move_to_uci(Move m, bool chess960) {
+
+  Square from = from_sq(m);
+  Square to = to_sq(m);
+
+  if (m == MOVE_NONE)
+      return "(none)";
+
+  if (m == MOVE_NULL)
+      return "0000";
+
+  if (type_of(m) == CASTLE && !chess960)
+      to = (to > from ? FILE_G : FILE_C) | rank_of(from);
+
+  string move = square_to_string(from) + square_to_string(to);
+
+  if (type_of(m) == PROMOTION)
+      move += PieceToChar[make_piece(BLACK, promotion_type(m))]; // Lower case
+
+  return move;
+}
+
+
+/// move_from_uci() takes a position and a string representing a move in
+/// simple coordinate notation and returns an equivalent legal Move if any.
+
+Move move_from_uci(const Position& pos, string& str) {
+
+  if (str.length() == 5) // Junior could send promotion piece in uppercase
+      str[4] = char(tolower(str[4]));
+
+  for (MoveList<LEGAL> ml(pos); !ml.end(); ++ml)
+      if (str == move_to_uci(ml.move(), pos.is_chess960()))
+          return ml.move();
+
+  return MOVE_NONE;
+}
+
+
+/// move_to_san() takes a position and a legal Move as input and returns its
+/// short algebraic notation representation.
+
+const string move_to_san(Position& pos, Move m) {
+
+  if (m == MOVE_NONE)
+      return "(none)";
+
+  if (m == MOVE_NULL)
+      return "(null)";
+
+  assert(pos.move_is_legal(m));
+
+  Bitboard attackers;
+  bool ambiguousMove, ambiguousFile, ambiguousRank;
+  string san;
+  Color us = pos.side_to_move();
+  Square from = from_sq(m);
+  Square to = to_sq(m);
+  Piece pc = pos.piece_on(from);
+  PieceType pt = type_of(pc);
+
+  if (type_of(m) == CASTLE)
+      san = to > from ? "O-O" : "O-O-O";
+  else
+  {
+      if (pt != PAWN)
+      {
+          san = PieceToChar[pt]; // Upper case
+
+          // Disambiguation if we have more then one piece with destination 'to'
+          // note that for pawns is not needed because starting file is explicit.
+          ambiguousMove = ambiguousFile = ambiguousRank = false;
+
+          attackers = (pos.attacks_from(pc, to) & pos.pieces(us, pt)) ^ from;
+
+          while (attackers)
+          {
+              Square sq = pop_lsb(&attackers);
+
+              // Pinned pieces are not included in the possible sub-set
+              if (!pos.pl_move_is_legal(make_move(sq, to), pos.pinned_pieces()))
+                  continue;
+
+              ambiguousFile |= file_of(sq) == file_of(from);
+              ambiguousRank |= rank_of(sq) == rank_of(from);
+              ambiguousMove = true;
+          }
+
+          if (ambiguousMove)
+          {
+              if (!ambiguousFile)
+                  san += file_to_char(file_of(from));
+
+              else if (!ambiguousRank)
+                  san += rank_to_char(rank_of(from));
+
+              else
+                  san += square_to_string(from);
+          }
+      }
+      else if (pos.is_capture(m))
+          san = file_to_char(file_of(from));
+
+      if (pos.is_capture(m))
+          san += 'x';
+
+      san += square_to_string(to);
+
+      if (type_of(m) == PROMOTION)
+          san += string("=") + PieceToChar[promotion_type(m)];
+  }
+
+  if (pos.move_gives_check(m, CheckInfo(pos)))
+  {
+      StateInfo st;
+      pos.do_move(m, st);
+      san += MoveList<LEGAL>(pos).size() ? "+" : "#";
+      pos.undo_move(m);
+  }
+
+  return san;
+}
+
+
+/// pretty_pv() formats human-readable search information, typically to be
+/// appended to the search log file. It uses the two helpers below to pretty
+/// format time and score respectively.
+
+static string time_to_string(int64_t msecs) {
+
+  const int MSecMinute = 1000 * 60;
+  const int MSecHour   = 1000 * 60 * 60;
+
+  int64_t hours   =   msecs / MSecHour;
+  int64_t minutes =  (msecs % MSecHour) / MSecMinute;
+  int64_t seconds = ((msecs % MSecHour) % MSecMinute) / 1000;
+
+  stringstream s;
+
+  if (hours)
+      s << hours << ':';
+
+  s << setfill('0') << setw(2) << minutes << ':' << setw(2) << seconds;
+
+  return s.str();
+}
+
+static string score_to_string(Value v) {
+
+  stringstream s;
+
+  if (v >= VALUE_MATE_IN_MAX_PLY)
+      s << "#" << (VALUE_MATE - v + 1) / 2;
+
+  else if (v <= VALUE_MATED_IN_MAX_PLY)
+      s << "-#" << (VALUE_MATE + v) / 2;
+
+  else
+      s << setprecision(2) << fixed << showpos << float(v) / PawnValueMg;
+
+  return s.str();
+}
+
+string pretty_pv(Position& pos, int depth, Value value, int64_t msecs, Move pv[]) {
+
+  const int64_t K = 1000;
+  const int64_t M = 1000000;
+
+  StateInfo state[MAX_PLY_PLUS_2], *st = state;
+  Move* m = pv;
+  string san, padding;
+  size_t length;
+  stringstream s;
+
+  s << setw(2) << depth
+    << setw(8) << score_to_string(value)
+    << setw(8) << time_to_string(msecs);
+
+  if (pos.nodes_searched() < M)
+      s << setw(8) << pos.nodes_searched() / 1 << "  ";
+
+  else if (pos.nodes_searched() < K * M)
+      s << setw(7) << pos.nodes_searched() / K << "K  ";
+
+  else
+      s << setw(7) << pos.nodes_searched() / M << "M  ";
+
+  padding = string(s.str().length(), ' ');
+  length = padding.length();
+
+  while (*m != MOVE_NONE)
+  {
+      san = move_to_san(pos, *m);
+
+      if (length + san.length() > 80)
+      {
+          s << "\n" + padding;
+          length = padding.length();
+      }
+
+      s << san << ' ';
+      length += san.length() + 1;
+
+      pos.do_move(*m++, *st++);
+  }
+
+  while (m != pv)
+      pos.undo_move(*--m);
+
+  return s.str();
+}

src/notation.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,24 +17,19 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#if !defined(NOTATION_H_INCLUDED)
+#define NOTATION_H_INCLUDED
 
-#if !defined(MERSENNE_H_INCLUDED)
+#include <string>
-#define MERSENNE_H_INCLUDED
-
-////
-//// Includes
-////
 
 #include "types.h"
 
+class Position;
 
-////
+std::string score_to_uci(Value v, Value alpha = -VALUE_INFINITE, Value beta = VALUE_INFINITE);
-//// Prototypes
+Move move_from_uci(const Position& pos, std::string& str);
-////
+const std::string move_to_uci(Move m, bool chess960);
+const std::string move_to_san(Position& pos, Move m);
+std::string pretty_pv(Position& pos, int depth, Value score, int64_t msecs, Move pv[]);
 
-extern uint32_t genrand_int32(void);
+#endif // !defined(NOTATION_H_INCLUDED)
-extern uint64_t genrand_int64(void);
-extern void init_mersenne(void);
-
-
-#endif // !defined(MERSENNE_H_INCLUDED)

src/pawns.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,380 +17,271 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-////
-//// Includes
-////
-
 #include <cassert>
-#include <cstring>
 
+#include "bitboard.h"
+#include "bitcount.h"
 #include "pawns.h"
 #include "position.h"
 
-
-////
-//// Local definitions
-////
-
 namespace {
 
-  /// Constants and variables
+  #define V Value
+  #define S(mg, eg) make_score(mg, eg)
 
-  // Doubled pawn penalty by file, middle game.
+  // Doubled pawn penalty by opposed flag and file
-  const Value DoubledPawnMidgamePenalty[8] = {
+  const Score DoubledPawnPenalty[2][8] = {
-    Value(20), Value(30), Value(34), Value(34),
+  { S(13, 43), S(20, 48), S(23, 48), S(23, 48),
-    Value(34), Value(34), Value(30), Value(20)
+    S(23, 48), S(23, 48), S(20, 48), S(13, 43) },
+  { S(13, 43), S(20, 48), S(23, 48), S(23, 48),
+    S(23, 48), S(23, 48), S(20, 48), S(13, 43) }};
+
+  // Isolated pawn penalty by opposed flag and file
+  const Score IsolatedPawnPenalty[2][8] = {
+  { S(37, 45), S(54, 52), S(60, 52), S(60, 52),
+    S(60, 52), S(60, 52), S(54, 52), S(37, 45) },
+  { S(25, 30), S(36, 35), S(40, 35), S(40, 35),
+    S(40, 35), S(40, 35), S(36, 35), S(25, 30) }};
+
+  // Backward pawn penalty by opposed flag and file
+  const Score BackwardPawnPenalty[2][8] = {
+  { S(30, 42), S(43, 46), S(49, 46), S(49, 46),
+    S(49, 46), S(49, 46), S(43, 46), S(30, 42) },
+  { S(20, 28), S(29, 31), S(33, 31), S(33, 31),
+    S(33, 31), S(33, 31), S(29, 31), S(20, 28) }};
+
+  // Pawn chain membership bonus by file
+  const Score ChainBonus[8] = {
+    S(11,-1), S(13,-1), S(13,-1), S(14,-1),
+    S(14,-1), S(13,-1), S(13,-1), S(11,-1)
   };
 
-  // Doubled pawn penalty by file, endgame.
+  // Candidate passed pawn bonus by rank
-  const Value DoubledPawnEndgamePenalty[8] = {
+  const Score CandidateBonus[8] = {
-    Value(35), Value(40), Value(40), Value(40),
+    S( 0, 0), S( 6, 13), S(6,13), S(14,29),
-    Value(40), Value(40), Value(40), Value(35)
+    S(34,68), S(83,166), S(0, 0), S( 0, 0)
   };
 
-  // Isolated pawn penalty by file, middle game.
+  const Score PawnStructureWeight = S(233, 201);
-  const Value IsolatedPawnMidgamePenalty[8] = {
-    Value(20), Value(30), Value(34), Value(34),
-    Value(34), Value(34), Value(30), Value(20)
-  };
 
-  // Isolated pawn penalty by file, endgame.
+  // Weakness of our pawn shelter in front of the king indexed by [king pawn][rank]
-  const Value IsolatedPawnEndgamePenalty[8] = {
+  const Value ShelterWeakness[2][8] =
-    Value(35), Value(40), Value(40), Value(40),
+  { { V(141), V(0), V(38), V(102), V(128), V(141), V(141) },
-    Value(40), Value(40), Value(40), Value(35)
+    { V( 61), V(0), V(16), V( 44), V( 56), V( 61), V( 61) } };
-  };
 
-  // Backward pawn penalty by file, middle game.
+  // Danger of enemy pawns moving toward our king indexed by [pawn blocked][rank]
-  const Value BackwardPawnMidgamePenalty[8] = {
+  const Value StormDanger[2][8] =
-    Value(16), Value(24), Value(27), Value(27),
+  { { V(26), V(0), V(128), V(51), V(26) },
-    Value(27), Value(27), Value(24), Value(16)
+    { V(13), V(0), V( 64), V(25), V(13) } };
-  };
 
-  // Backward pawn penalty by file, endgame.
+  // Max bonus for king safety. Corresponds to start position with all the pawns
-  const Value BackwardPawnEndgamePenalty[8] = {
+  // in front of the king and no enemy pawn on the horizont.
-    Value(28), Value(32), Value(32), Value(32),
+  const Value MaxSafetyBonus = V(263);
-    Value(32), Value(32), Value(32), Value(28)
-  };
-
-  // Pawn chain membership bonus by file, middle game.
-  const Value ChainMidgameBonus[8] = {
-    Value(14), Value(16), Value(17), Value(18),
-    Value(18), Value(17), Value(16), Value(14)
-  };
-
-  // Pawn chain membership bonus by file, endgame.
-  const Value ChainEndgameBonus[8] = {
-    Value(16), Value(16), Value(16), Value(16),
-    Value(16), Value(16), Value(16), Value(16)
-  };
-
-  // Candidate passed pawn bonus by rank, middle game.
-  const Value CandidateMidgameBonus[8] = {
-    Value( 0), Value(12), Value(12), Value(20),
-    Value(40), Value(90), Value( 0), Value( 0)
-  };
-
-  // Candidate passed pawn bonus by rank, endgame.
-  const Value CandidateEndgameBonus[8] = {
-    Value( 0), Value(24), Value(24), Value(40),
-    Value(80), Value(180), Value(0), Value( 0)
-  };
-
-  // Pawn storm tables for positions with opposite castling:
-  const int QStormTable[64] = {
-    0,  0,  0,  0, 0, 0, 0, 0,
-  -22,-22,-22,-13,-4, 0, 0, 0,
-   -4, -9, -9, -9,-4, 0, 0, 0,
-    9, 18, 22, 18, 9, 0, 0, 0,
-   22, 31, 31, 22, 0, 0, 0, 0,
-   31, 40, 40, 31, 0, 0, 0, 0,
-   31, 40, 40, 31, 0, 0, 0, 0,
-    0,  0,  0,  0, 0, 0, 0, 0
-  };
-
-  const int KStormTable[64] = {
-    0, 0, 0, 0,  0,  0,  0,  0,
-    0, 0, 0,-4,-13,-22,-27,-27,
-    0, 0, 0,-4, -9,-13,-18,-18,
-    0, 0, 0, 0,  9,  9,  9,  9,
-    0, 0, 0, 0,  9, 18, 27, 27,
-    0, 0, 0, 0,  9, 27, 40, 36,
-    0, 0, 0, 0,  0, 31, 40, 31,
-    0, 0, 0, 0,  0,  0,  0,  0
-  };
-
-  // Pawn storm open file bonuses by file
-  const int16_t KStormOpenFileBonus[8] = { 45, 45, 30, 0, 0, 0, 0, 0 };
-  const int16_t QStormOpenFileBonus[8] = { 0, 0, 0, 0, 0, 30, 45, 30 };
-
-  // Pawn storm lever bonuses by file
-  const int StormLeverBonus[8] = { 20, 20, 10, 0, 0, 10, 20, 20 };
 
+  #undef S
+  #undef V
 }
 
 
-////
+/// PawnTable::probe() takes a position object as input, computes a PawnEntry
-//// Functions
+/// object, and returns a pointer to it. The result is also stored in a hash
-////
+/// table, so we don't have to recompute everything when the same pawn structure
+/// occurs again.
 
-/// Constructor
+PawnEntry* PawnTable::probe(const Position& pos) {
 
-PawnInfoTable::PawnInfoTable(unsigned numOfEntries) {
+  Key key = pos.pawn_key();
+  PawnEntry* e = entries[key];
 
-  size = numOfEntries;
+  // If e->key matches the position's pawn hash key, it means that we
-  entries = new PawnInfo[size];
+  // have analysed this pawn structure before, and we can simply return
-  if (entries == NULL)
+  // the information we found the last time instead of recomputing it.
-  {
+  if (e->key == key)
-      std::cerr << "Failed to allocate " << (numOfEntries * sizeof(PawnInfo))
+      return e;
-                << " bytes for pawn hash table." << std::endl;
+
-      exit(EXIT_FAILURE);
+  e->key = key;
-  }
+  e->passedPawns[WHITE] = e->passedPawns[BLACK] = 0;
-  clear();
+  e->kingSquares[WHITE] = e->kingSquares[BLACK] = SQ_NONE;
+  e->halfOpenFiles[WHITE] = e->halfOpenFiles[BLACK] = 0xFF;
+
+  Bitboard wPawns = pos.pieces(WHITE, PAWN);
+  Bitboard bPawns = pos.pieces(BLACK, PAWN);
+  e->pawnAttacks[WHITE] = ((wPawns & ~FileHBB) << 9) | ((wPawns & ~FileABB) << 7);
+  e->pawnAttacks[BLACK] = ((bPawns & ~FileHBB) >> 7) | ((bPawns & ~FileABB) >> 9);
+
+  e->value =  evaluate_pawns<WHITE>(pos, wPawns, bPawns, e)
+            - evaluate_pawns<BLACK>(pos, bPawns, wPawns, e);
+
+  e->value = apply_weight(e->value, PawnStructureWeight);
+
+  return e;
 }
 
 
-/// Destructor
+/// PawnTable::evaluate_pawns() evaluates each pawn of the given color
 
-PawnInfoTable::~PawnInfoTable() {
+template<Color Us>
-  delete [] entries;
+Score PawnTable::evaluate_pawns(const Position& pos, Bitboard ourPawns,
-}
+                                Bitboard theirPawns, PawnEntry* e) {
 
+  const Color Them = (Us == WHITE ? BLACK : WHITE);
 
-/// PawnInfoTable::clear() clears the pawn hash table by setting all
+  Bitboard b;
-/// entries to 0.
+  Square s;
-
+  File f;
-void PawnInfoTable::clear() {
+  Rank r;
-  memset(entries, 0, size * sizeof(PawnInfo));
+  bool passed, isolated, doubled, opposed, chain, backward, candidate;
-}
+  Score value = SCORE_ZERO;
-
+  const Square* pl = pos.piece_list(Us, PAWN);
-
-/// PawnInfoTable::get_pawn_info() takes a position object as input, computes
-/// a PawnInfo object, and returns a pointer to it.  The result is also
-/// stored in a hash table, so we don't have to recompute everything when
-/// the same pawn structure occurs again.
-
-PawnInfo *PawnInfoTable::get_pawn_info(const Position &pos) {
-
-  assert(pos.is_ok());
-
-  Key key = pos.get_pawn_key();
-  int index = int(key & (size - 1));
-  PawnInfo *pi = entries + index;
-
-  // If pi->key matches the position's pawn hash key, it means that we
-  // have analysed this pawn structure before, and we can simply return the
-  // information we found the last time instead of recomputing it
-  if (pi->key == key)
-      return pi;
-
-  // Clear the PawnInfo object, and set the key
-  pi->clear();
-  pi->key = key;
-
-  Value mgValue[2] = {Value(0), Value(0)};
-  Value egValue[2] = {Value(0), Value(0)};
-
-  // Loop through the pawns for both colors
-  for (Color us = WHITE; us <= BLACK; us++)
-  {
-    Color them = opposite_color(us);
-    Bitboard ourPawns = pos.pawns(us);
-    Bitboard theirPawns = pos.pawns(them);
-    Bitboard pawns = ourPawns;
-    int bonus;
-
-    // Initialize pawn storm scores by giving bonuses for open files
-    for (File f = FILE_A; f <= FILE_H; f++)
-        if (pos.file_is_half_open(us, f))
-        {
-            pi->ksStormValue[us] += KStormOpenFileBonus[f];
-            pi->qsStormValue[us] += QStormOpenFileBonus[f];
-        }
 
   // Loop through all pawns of the current color and score each pawn
-    while (pawns)
+  while ((s = *pl++) != SQ_NONE)
   {
-        bool passed, doubled, isolated, backward, chain, candidate;
+      assert(pos.piece_on(s) == make_piece(Us, PAWN));
-        Square s = pop_1st_bit(&pawns);
-        File f = square_file(s);
-        Rank r = square_rank(s);
 
-        assert(pos.piece_on(s) == piece_of_color_and_type(us, PAWN));
+      f = file_of(s);
+      r = rank_of(s);
 
-        // The file containing the pawn is not half open
+      // This file cannot be half open
-        pi->halfOpenFiles[us] &= ~(1 << f);
+      e->halfOpenFiles[Us] &= ~(1 << f);
 
-        // Passed, isolated or doubled pawn?
+      // Our rank plus previous one. Used for chain detection
-        passed = pos.pawn_is_passed(us, s);
+      b = rank_bb(r) | rank_bb(Us == WHITE ? r - Rank(1) : r + Rank(1));
-        isolated = pos.pawn_is_isolated(us, s);
-        doubled = pos.pawn_is_doubled(us, s);
 
-        // We calculate kingside and queenside pawn storm
+      // Flag the pawn as passed, isolated, doubled or member of a pawn
-        // scores for both colors. These are used when evaluating
+      // chain (but not the backward one).
-        // middle game positions with opposite side castling.
+      chain    =   ourPawns   & adjacent_files_bb(f) & b;
-        //
+      isolated = !(ourPawns   & adjacent_files_bb(f));
-        // Each pawn is given a base score given by a piece square table
+      doubled  =   ourPawns   & forward_bb(Us, s);
-        // (KStormTable[] or QStormTable[]). Pawns which seem to have good
+      opposed  =   theirPawns & forward_bb(Us, s);
-        // chances of creating an open file by exchanging itself against an
+      passed   = !(theirPawns & passed_pawn_mask(Us, s));
-        // enemy pawn on an adjacent file gets an additional bonus.
-
-        // Kingside pawn storms
-        bonus = KStormTable[relative_square(us, s)];
-        if (f >= FILE_F)
-        {
-            Bitboard b = outpost_mask(us, s) & theirPawns & (FileFBB | FileGBB | FileHBB);
-            while (b)
-            {
-                Square s2 = pop_1st_bit(&b);
-                if (!(theirPawns & neighboring_files_bb(s2) & rank_bb(s2)))
-                {
-                    // The enemy pawn has no pawn beside itself, which makes it
-                    // particularly vulnerable. Big bonus, especially against a
-                    // weakness on the rook file.
-                    if (square_file(s2) == FILE_H)
-                        bonus += 4*StormLeverBonus[f] - 8*square_distance(s, s2);
-                    else
-                        bonus += 2*StormLeverBonus[f] - 4*square_distance(s, s2);
-                } else
-                    // There is at least one enemy pawn beside the enemy pawn we look
-                    // at, which means that the pawn has somewhat better chances of
-                    // defending itself by advancing. Smaller bonus.
-                    bonus += StormLeverBonus[f] - 2*square_distance(s, s2);
-            }
-        }
-        pi->ksStormValue[us] += bonus;
-
-        // Queenside pawn storms
-        bonus = QStormTable[relative_square(us, s)];
-        if (f <= FILE_C)
-        {
-            Bitboard b = outpost_mask(us, s) & theirPawns & (FileABB | FileBBB | FileCBB);
-            while (b)
-            {
-                Square s2 = pop_1st_bit(&b);
-                if (!(theirPawns & neighboring_files_bb(s2) & rank_bb(s2)))
-                {
-                    // The enemy pawn has no pawn beside itself, which makes it
-                    // particularly vulnerable. Big bonus, especially against a
-                    // weakness on the rook file.
-                    if (square_file(s2) == FILE_A)
-                        bonus += 4*StormLeverBonus[f] - 16*square_distance(s, s2);
-                    else
-                        bonus += 2*StormLeverBonus[f] - 8*square_distance(s, s2);
-                } else
-                    // There is at least one enemy pawn beside the enemy pawn we look
-                    // at, which means that the pawn has somewhat better chances of
-                    // defending itself by advancing. Smaller bonus.
-                    bonus += StormLeverBonus[f] - 4*square_distance(s, s2);
-            }
-        }
-        pi->qsStormValue[us] += bonus;
-
-        // Member of a pawn chain (but not the backward one)? We could speed up
-        // the test a little by introducing an array of masks indexed by color
-        // and square for doing the test, but because everything is hashed,
-        // it probably won't make any noticable difference.
-        chain =  ourPawns
-               & neighboring_files_bb(f)
-               & (rank_bb(r) | rank_bb(r - (us == WHITE ? 1 : -1)));
 
       // Test for backward pawn
-        //
-        // If the pawn is passed, isolated, or member of a pawn chain
-        // it cannot be backward. If can capture an enemy pawn or if
-        // there are friendly pawns behind on neighboring files it cannot
-        // be backward either.
-        if (   passed
-            || isolated
-            || chain
-            || (pos.pawn_attacks(us, s) & theirPawns)
-            || (ourPawns & behind_bb(us, r) & neighboring_files_bb(f)))
       backward = false;
-        else
+
+      // If the pawn is passed, isolated, or member of a pawn chain it cannot
+      // be backward. If there are friendly pawns behind on adjacent files
+      // or if can capture an enemy pawn it cannot be backward either.
+      if (   !(passed | isolated | chain)
+          && !(ourPawns & attack_span_mask(Them, s))
+          && !(pos.attacks_from<PAWN>(s, Us) & theirPawns))
       {
           // We now know that there are no friendly pawns beside or behind this
-            // pawn on neighboring files. We now check whether the pawn is
+          // pawn on adjacent files. We now check whether the pawn is
-            // backward by looking in the forward direction on the neighboring
+          // backward by looking in the forward direction on the adjacent
           // files, and seeing whether we meet a friendly or an enemy pawn first.
-            Bitboard b;
+          b = pos.attacks_from<PAWN>(s, Us);
-            if (us == WHITE)
+
-            {
+          // Note that we are sure to find something because pawn is not passed
-                for (b = pos.pawn_attacks(us, s); !(b & (ourPawns | theirPawns)); b <<= 8);
+          // nor isolated, so loop is potentially infinite, but it isn't.
-                backward = (b | (b << 8)) & theirPawns;
+          while (!(b & (ourPawns | theirPawns)))
-            }
+              Us == WHITE ? b <<= 8 : b >>= 8;
-            else
+
-            {
+          // The friendly pawn needs to be at least two ranks closer than the
-                for (b = pos.pawn_attacks(us, s); !(b & (ourPawns | theirPawns)); b >>= 8);
+          // enemy pawn in order to help the potentially backward pawn advance.
-                backward = (b | (b >> 8)) & theirPawns;
+          backward = (b | (Us == WHITE ? b << 8 : b >> 8)) & theirPawns;
-            }
       }
 
-        // Test for candidate passed pawn
+      assert(opposed | passed | (attack_span_mask(Us, s) & theirPawns));
-        candidate =    !passed
-                     && pos.file_is_half_open(them, f)
-                     && (  count_1s_max_15(neighboring_files_bb(f) & (behind_bb(us, r) | rank_bb(r)) & ourPawns)
-                         - count_1s_max_15(neighboring_files_bb(f) & in_front_bb(us, r)              & theirPawns)
-                         >= 0);
 
-        // In order to prevent doubled passed pawns from receiving a too big
+      // A not passed pawn is a candidate to become passed if it is free to
-        // bonus, only the frontmost passed pawn on each file is considered as
+      // advance and if the number of friendly pawns beside or behind this
-        // a true passed pawn.
+      // pawn on adjacent files is higher or equal than the number of
-        if (passed && (ourPawns & squares_in_front_of(us, s)))
+      // enemy pawns in the forward direction on the adjacent files.
-        {
+      candidate =   !(opposed | passed | backward | isolated)
-            // candidate = true;
+                 && (b = attack_span_mask(Them, s + pawn_push(Us)) & ourPawns) != 0
-            passed = false;
+                 &&  popcount<Max15>(b) >= popcount<Max15>(attack_span_mask(Us, s) & theirPawns);
-        }
+
+      // Passed pawns will be properly scored in evaluation because we need
+      // full attack info to evaluate passed pawns. Only the frontmost passed
+      // pawn on each file is considered a true passed pawn.
+      if (passed && !doubled)
+          e->passedPawns[Us] |= s;
 
       // Score this pawn
-        Value mv = Value(0), ev = Value(0);
       if (isolated)
-        {
+          value -= IsolatedPawnPenalty[opposed][f];
-            mv -= IsolatedPawnMidgamePenalty[f];
+
-            ev -= IsolatedPawnEndgamePenalty[f];
-            if (pos.file_is_half_open(them, f))
-            {
-                mv -= IsolatedPawnMidgamePenalty[f] / 2;
-                ev -= IsolatedPawnEndgamePenalty[f] / 2;
-            }
-        }
       if (doubled)
-        {
+          value -= DoubledPawnPenalty[opposed][f];
-            mv -= DoubledPawnMidgamePenalty[f];
+
-            ev -= DoubledPawnEndgamePenalty[f];
-        }
       if (backward)
-        {
+          value -= BackwardPawnPenalty[opposed][f];
-            mv -= BackwardPawnMidgamePenalty[f];
+
-            ev -= BackwardPawnEndgamePenalty[f];
-            if (pos.file_is_half_open(them, f))
-            {
-                mv -= BackwardPawnMidgamePenalty[f] / 2;
-                ev -= BackwardPawnEndgamePenalty[f] / 2;
-            }
-        }
       if (chain)
-        {
+          value += ChainBonus[f];
-            mv += ChainMidgameBonus[f];
+
-            ev += ChainEndgameBonus[f];
-        }
       if (candidate)
+          value += CandidateBonus[relative_rank(Us, s)];
+  }
+
+  return value;
+}
+
+
+/// PawnEntry::shelter_storm() calculates shelter and storm penalties for the file
+/// the king is on, as well as the two adjacent files.
+
+template<Color Us>
+Value PawnEntry::shelter_storm(const Position& pos, Square ksq) {
+
+  const Color Them = (Us == WHITE ? BLACK : WHITE);
+
+  Value safety = MaxSafetyBonus;
+  Bitboard b = pos.pieces(PAWN) & (in_front_bb(Us, ksq) | rank_bb(ksq));
+  Bitboard ourPawns = b & pos.pieces(Us) & ~rank_bb(ksq);
+  Bitboard theirPawns = b & pos.pieces(Them);
+  Rank rkUs, rkThem;
+  File kf = file_of(ksq);
+
+  kf = (kf == FILE_A) ? kf++ : (kf == FILE_H) ? kf-- : kf;
+
+  for (int f = kf - 1; f <= kf + 1; f++)
   {
-            mv += CandidateMidgameBonus[relative_rank(us, s)];
+      // Shelter penalty is higher for the pawn in front of the king
-            ev += CandidateEndgameBonus[relative_rank(us, s)];
+      b = ourPawns & FileBB[f];
+      rkUs = b ? rank_of(Us == WHITE ? lsb(b) : ~msb(b)) : RANK_1;
+      safety -= ShelterWeakness[f != kf][rkUs];
+
+      // Storm danger is smaller if enemy pawn is blocked
+      b  = theirPawns & FileBB[f];
+      rkThem = b ? rank_of(Us == WHITE ? lsb(b) : ~msb(b)) : RANK_1;
+      safety -= StormDanger[rkThem == rkUs + 1][rkThem];
   }
 
-        mgValue[us] += mv;
+  return safety;
-        egValue[us] += ev;
-
-        // If the pawn is passed, set the square of the pawn in the passedPawns
-        // bitboard
-        if (passed)
-            set_bit(&(pi->passedPawns), s);
-    } // while(pawns)
-  } // for(colors)
-
-  pi->mgValue = int16_t(mgValue[WHITE] - mgValue[BLACK]);
-  pi->egValue = int16_t(egValue[WHITE] - egValue[BLACK]);
-  return pi;
 }
+
+
+/// PawnEntry::update_safety() calculates and caches a bonus for king safety. It is
+/// called only when king square changes, about 20% of total king_safety() calls.
+
+template<Color Us>
+Score PawnEntry::update_safety(const Position& pos, Square ksq) {
+
+  kingSquares[Us] = ksq;
+  castleRights[Us] = pos.can_castle(Us);
+  minKPdistance[Us] = 0;
+
+  Bitboard pawns = pos.pieces(Us, PAWN);
+  if (pawns)
+      while (!(DistanceRingsBB[ksq][minKPdistance[Us]++] & pawns)) {}
+
+  if (relative_rank(Us, ksq) > RANK_4)
+      return kingSafety[Us] = make_score(0, -16 * minKPdistance[Us]);
+
+  Value bonus = shelter_storm<Us>(pos, ksq);
+
+  // If we can castle use the bonus after the castle if is bigger
+  if (pos.can_castle(make_castle_right(Us, KING_SIDE)))
+      bonus = std::max(bonus, shelter_storm<Us>(pos, relative_square(Us, SQ_G1)));
+
+  if (pos.can_castle(make_castle_right(Us, QUEEN_SIDE)))
+      bonus = std::max(bonus, shelter_storm<Us>(pos, relative_square(Us, SQ_C1)));
+
+  return kingSafety[Us] = make_score(bonus, -16 * minKPdistance[Us]);
+}
+
+// Explicit template instantiation
+template Score PawnEntry::update_safety<WHITE>(const Position& pos, Square ksq);
+template Score PawnEntry::update_safety<BLACK>(const Position& pos, Square ksq);

src/pawns.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,117 +17,99 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(PAWNS_H_INCLUDED)
 #define PAWNS_H_INCLUDED
 
-////
+#include "misc.h"
-//// Includes
+#include "position.h"
-////
+#include "types.h"
 
-#include "bitboard.h"
+const int PawnTableSize = 16384;
-#include "value.h"
 
-////
+/// PawnEntry is a class which contains various information about a pawn
-//// Types
-////
-
-/// PawnInfo is a class which contains various information about a pawn
 /// structure. Currently, it only includes a middle game and an end game
 /// pawn structure evaluation, and a bitboard of passed pawns. We may want
-/// to add further information in the future.  A lookup to the pawn hash table
+/// to add further information in the future. A lookup to the pawn hash
-/// (performed by calling the get_pawn_info method in a PawnInfoTable object)
+/// table (performed by calling the probe method in a PawnTable object)
-/// returns a pointer to a PawnInfo object.
+/// returns a pointer to a PawnEntry object.
-class Position;
 
-class PawnInfo {
+class PawnEntry {
 
-  friend class PawnInfoTable;
+  friend struct PawnTable;
 
 public:
-  Value mg_value() const;
+  Score pawns_value() const;
-  Value eg_value() const;
+  Bitboard pawn_attacks(Color c) const;
-  Value kingside_storm_value(Color c) const;
+  Bitboard passed_pawns(Color c) const;
-  Value queenside_storm_value(Color c) const;
-  Bitboard passed_pawns() const;
   int file_is_half_open(Color c, File f) const;
   int has_open_file_to_left(Color c, File f) const;
   int has_open_file_to_right(Color c, File f) const;
 
+  template<Color Us>
+  Score king_safety(const Position& pos, Square ksq);
+
 private:
-  void clear();
+  template<Color Us>
+  Score update_safety(const Position& pos, Square ksq);
+
+  template<Color Us>
+  Value shelter_storm(const Position& pos, Square ksq);
 
   Key key;
-  Bitboard passedPawns;
+  Bitboard passedPawns[2];
-  int16_t mgValue, egValue;
+  Bitboard pawnAttacks[2];
-  int16_t ksStormValue[2], qsStormValue[2];
+  Square kingSquares[2];
-  uint8_t halfOpenFiles[2];
+  int minKPdistance[2];
+  int castleRights[2];
+  Score value;
+  int halfOpenFiles[2];
+  Score kingSafety[2];
 };
 
 
-/// The PawnInfoTable class represents a pawn hash table.  It is basically
+/// The PawnTable class represents a pawn hash table. The most important
-/// just an array of PawnInfo objects and a few methods for accessing these
+/// method is probe, which returns a pointer to a PawnEntry object.
-/// objects.  The most important method is get_pawn_info, which looks up a
-/// position in the table and returns a pointer to a PawnInfo object.
 
-class PawnInfoTable {
+struct PawnTable {
 
-public:
+  PawnEntry* probe(const Position& pos);
-  PawnInfoTable(unsigned numOfEntries);
-  ~PawnInfoTable();
-  void clear();
-  PawnInfo* get_pawn_info(const Position& pos);
 
-private:
+  template<Color Us>
-  unsigned size;
+  static Score evaluate_pawns(const Position& pos, Bitboard ourPawns,
-  PawnInfo* entries;
+                              Bitboard theirPawns, PawnEntry* e);
+
+  HashTable<PawnEntry, PawnTableSize> entries;
 };
 
 
-////
+inline Score PawnEntry::pawns_value() const {
-//// Inline functions
+  return value;
-////
-
-inline Value PawnInfo::mg_value() const {
-  return Value(mgValue);
 }
 
-inline Value PawnInfo::eg_value() const {
+inline Bitboard PawnEntry::pawn_attacks(Color c) const {
-  return Value(egValue);
+  return pawnAttacks[c];
 }
 
-inline Bitboard PawnInfo::passed_pawns() const {
+inline Bitboard PawnEntry::passed_pawns(Color c) const {
-  return passedPawns;
+  return passedPawns[c];
 }
 
-inline Value PawnInfo::kingside_storm_value(Color c) const {
+inline int PawnEntry::file_is_half_open(Color c, File f) const {
-  return Value(ksStormValue[c]);
+  return halfOpenFiles[c] & (1 << int(f));
 }
 
-inline Value PawnInfo::queenside_storm_value(Color c) const {
+inline int PawnEntry::has_open_file_to_left(Color c, File f) const {
-  return Value(qsStormValue[c]);
-}
-
-inline int PawnInfo::file_is_half_open(Color c, File f) const {
-  return (halfOpenFiles[c] & (1 << int(f)));
-}
-
-inline int PawnInfo::has_open_file_to_left(Color c, File f) const {
   return halfOpenFiles[c] & ((1 << int(f)) - 1);
 }
 
-inline int PawnInfo::has_open_file_to_right(Color c, File f) const {
+inline int PawnEntry::has_open_file_to_right(Color c, File f) const {
   return halfOpenFiles[c] & ~((1 << int(f+1)) - 1);
 }
 
-inline void PawnInfo::clear() {
+template<Color Us>
-
+inline Score PawnEntry::king_safety(const Position& pos, Square ksq) {
-  passedPawns = EmptyBoardBB;
+  return kingSquares[Us] == ksq && castleRights[Us] == pos.can_castle(Us)
-  mgValue = egValue = 0;
+       ? kingSafety[Us] : update_safety<Us>(pos, ksq);
-  ksStormValue[WHITE] = ksStormValue[BLACK] = 0;
-  qsStormValue[WHITE] = qsStormValue[BLACK] = 0;
-  halfOpenFiles[WHITE] = halfOpenFiles[BLACK] = 0xFF;
 }
 
-
 #endif // !defined(PAWNS_H_INCLUDED)

src/piece.cpp

@@ -1,49 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-////
-//// Includes
-////
-
-#include <string>
-
-#include "piece.h"
-
-using namespace std;
-
-////
-//// Functions
-////
-
-/// Translating piece types to/from English piece letters
-
-static const string PieceChars(" pnbrqk PNBRQK");
-
-char piece_type_to_char(PieceType pt, bool upcase) {
-
-  return PieceChars[pt + upcase * 7];
-}
-
-PieceType piece_type_from_char(char c) {
-
-  size_t idx = PieceChars.find(c);
-
-  return idx != string::npos ? PieceType(idx % 7) : NO_PIECE_TYPE;
-}

src/piece.h

@@ -1,111 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(PIECE_H_INCLUDED)
-#define PIECE_H_INCLUDED
-
-////
-//// Includes
-////
-
-#include "color.h"
-#include "square.h"
-
-
-////
-//// Types
-////
-
-enum PieceType {
-  NO_PIECE_TYPE = 0,
-  PAWN = 1, KNIGHT = 2, BISHOP = 3, ROOK = 4, QUEEN = 5, KING = 6
-};
-
-enum Piece {
-  NO_PIECE = 0, WP = 1, WN = 2, WB = 3, WR = 4, WQ = 5, WK = 6,
-  BP = 9, BN = 10, BB = 11, BR = 12, BQ = 13, BK = 14,
-  EMPTY = 16, OUTSIDE = 17
-};
-
-
-////
-//// Constants
-////
-
-const int SlidingArray[18] = {
-  0, 0, 0, 1, 2, 3, 0, 0, 0, 0, 0, 1, 2, 3, 0, 0, 0, 0
-};
-
-
-////
-//// Inline functions
-////
-
-inline Piece operator+ (Piece p, int i) { return Piece(int(p) + i); }
-inline void operator++ (Piece &p, int) { p = Piece(int(p) + 1); }
-inline Piece operator- (Piece p, int i) { return Piece(int(p) - i); }
-inline void operator-- (Piece &p, int) { p = Piece(int(p) - 1); }
-inline PieceType operator+ (PieceType p, int i) {return PieceType(int(p) + i);}
-inline void operator++ (PieceType &p, int) { p = PieceType(int(p) + 1); }
-inline PieceType operator- (PieceType p, int i) {return PieceType(int(p) - i);}
-inline void operator-- (PieceType &p, int) { p = PieceType(int(p) - 1); }
-
-inline PieceType type_of_piece(Piece p)  {
-  return PieceType(int(p) & 7);
-}
-
-inline Color color_of_piece(Piece p) {
-  return Color(int(p) >> 3);
-}
-
-inline Piece piece_of_color_and_type(Color c, PieceType pt) {
-  return Piece((int(c) << 3) | int(pt));
-}
-
-inline int piece_is_slider(Piece p) {
-  return SlidingArray[int(p)];
-}
-
-inline int piece_is_slider(PieceType pt) {
-  return SlidingArray[int(pt)];
-}
-
-inline SquareDelta pawn_push(Color c) {
-    return (c == WHITE ? DELTA_N : DELTA_S);
-}
-
-inline bool piece_type_is_ok(PieceType pc) {
-  return pc >= PAWN && pc <= KING;
-}
-
-inline bool piece_is_ok(Piece pc) {
-  return piece_type_is_ok(type_of_piece(pc)) && color_is_ok(color_of_piece(pc));
-}
-
-
-////
-//// Prototypes
-////
-
-extern char piece_type_to_char(PieceType pt, bool upcase = false);
-extern PieceType piece_type_from_char(char c);
-
-
-#endif // !defined(PIECE_H_INCLUDED)

src/platform.h

@@ -0,0 +1,109 @@
+/*
+  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
+  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
+
+  Stockfish is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  Stockfish is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#if !defined(PLATFORM_H_INCLUDED)
+#define PLATFORM_H_INCLUDED
+
+#if defined(_MSC_VER)
+
+// Disable some silly and noisy warning from MSVC compiler
+#pragma warning(disable: 4127) // Conditional expression is constant
+#pragma warning(disable: 4146) // Unary minus operator applied to unsigned type
+#pragma warning(disable: 4800) // Forcing value to bool 'true' or 'false'
+#pragma warning(disable: 4996) // Function _ftime() may be unsafe
+
+// MSVC does not support <inttypes.h>
+typedef   signed __int8    int8_t;
+typedef unsigned __int8   uint8_t;
+typedef   signed __int16  int16_t;
+typedef unsigned __int16 uint16_t;
+typedef   signed __int32  int32_t;
+typedef unsigned __int32 uint32_t;
+typedef   signed __int64  int64_t;
+typedef unsigned __int64 uint64_t;
+
+#else
+#  include <inttypes.h>
+#endif
+
+#if !defined(_WIN32) && !defined(_WIN64) // Linux - Unix
+
+#  include <sys/time.h>
+typedef timeval sys_time_t;
+
+inline void system_time(sys_time_t* t) { gettimeofday(t, NULL); }
+inline int64_t time_to_msec(const sys_time_t& t) { return t.tv_sec * 1000LL + t.tv_usec / 1000; }
+
+#  include <pthread.h>
+typedef pthread_mutex_t Lock;
+typedef pthread_cond_t WaitCondition;
+typedef pthread_t NativeHandle;
+typedef void*(*pt_start_fn)(void*);
+
+#  define lock_init(x) pthread_mutex_init(&(x), NULL)
+#  define lock_grab(x) pthread_mutex_lock(&(x))
+#  define lock_release(x) pthread_mutex_unlock(&(x))
+#  define lock_destroy(x) pthread_mutex_destroy(&(x))
+#  define cond_destroy(x) pthread_cond_destroy(&(x))
+#  define cond_init(x) pthread_cond_init(&(x), NULL)
+#  define cond_signal(x) pthread_cond_signal(&(x))
+#  define cond_wait(x,y) pthread_cond_wait(&(x),&(y))
+#  define cond_timedwait(x,y,z) pthread_cond_timedwait(&(x),&(y),z)
+#  define thread_create(x,f,t) !pthread_create(&(x),NULL,(pt_start_fn)f,t)
+#  define thread_join(x) pthread_join(x, NULL)
+
+#else // Windows and MinGW
+
+#  include <sys/timeb.h>
+typedef _timeb sys_time_t;
+
+inline void system_time(sys_time_t* t) { _ftime(t); }
+inline int64_t time_to_msec(const sys_time_t& t) { return t.time * 1000LL + t.millitm; }
+
+#if !defined(NOMINMAX)
+#  define NOMINMAX // disable macros min() and max()
+#endif
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#undef WIN32_LEAN_AND_MEAN
+#undef NOMINMAX
+
+// We use critical sections on Windows to support Windows XP and older versions,
+// unfortunatly cond_wait() is racy between lock_release() and WaitForSingleObject()
+// but apart from this they have the same speed performance of SRW locks.
+typedef CRITICAL_SECTION Lock;
+typedef HANDLE WaitCondition;
+typedef HANDLE NativeHandle;
+
+#  define lock_init(x) InitializeCriticalSection(&(x))
+#  define lock_grab(x) EnterCriticalSection(&(x))
+#  define lock_release(x) LeaveCriticalSection(&(x))
+#  define lock_destroy(x) DeleteCriticalSection(&(x))
+#  define cond_init(x) { x = CreateEvent(0, FALSE, FALSE, 0); }
+#  define cond_destroy(x) CloseHandle(x)
+#  define cond_signal(x) SetEvent(x)
+#  define cond_wait(x,y) { lock_release(y); WaitForSingleObject(x, INFINITE); lock_grab(y); }
+#  define cond_timedwait(x,y,z) { lock_release(y); WaitForSingleObject(x,z); lock_grab(y); }
+#  define thread_create(x,f,t) (x = CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)f,t,0,NULL), x != NULL)
+#  define thread_join(x) { WaitForSingleObject(x, INFINITE); CloseHandle(x); }
+
+#endif
+
+#endif // !defined(PLATFORM_H_INCLUDED)

src/position.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,68 +17,28 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(POSITION_H_INCLUDED)
 #define POSITION_H_INCLUDED
 
-// Disable a silly and noisy warning from MSVC compiler
+#include <cassert>
-#if defined(_MSC_VER)
-
-// Forcing value to bool 'true' or 'false' (performance warning)
-#pragma warning(disable: 4800)
-
-// Conditional expression is constant
-#pragma warning(disable: 4127)
-
-
-#endif
-
-////
-//// Includes
-////
 
 #include "bitboard.h"
-#include "color.h"
+#include "types.h"
-#include "direction.h"
-#include "move.h"
-#include "piece.h"
-#include "square.h"
-#include "value.h"
 
 
-////
+/// The checkInfo struct is initialized at c'tor time and keeps info used
-//// Constants
+/// to detect if a move gives check.
-////
+class Position;
+class Thread;
 
-/// FEN string for the initial position:
+struct CheckInfo {
-const std::string StartPosition =
-  "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
 
-/// Maximum number of plies per game (220 should be enough, because the
+  explicit CheckInfo(const Position&);
-/// maximum search depth is 100, and during position setup we reset the
-/// move counter for every non-reversible move):
-const int MaxGameLength = 220;
 
-
+  Bitboard dcCandidates;
-////
+  Bitboard pinned;
-//// Types
+  Bitboard checkSq[8];
-////
+  Square ksq;
-
-/// Castle rights, encoded as bit fields
-
-enum CastleRights {
-  NO_CASTLES = 0,
-  WHITE_OO = 1,
-  BLACK_OO = 2,
-  WHITE_OOO = 4,
-  BLACK_OOO = 8,
-  ALL_CASTLES = 15
-};
-
-/// Game phase
-enum Phase {
-  PHASE_ENDGAME = 0,
-  PHASE_MIDGAME = 128
 };
 
 
@@ -88,23 +48,32 @@ enum Phase {
 /// must be passed as a parameter.
 
 struct StateInfo {
-  Key key, pawnKey, materialKey;
+  Key pawnKey, materialKey;
-  int castleRights, rule50;
+  Value npMaterial[2];
+  int castleRights, rule50, pliesFromNull;
+  Score psqScore;
   Square epSquare;
-  Value mgValue, egValue;
 
-  PieceType capture;
+  Key key;
   Bitboard checkersBB;
-  Move lastMove;
+  PieceType capturedType;
   StateInfo* previous;
 };
 
+struct ReducedStateInfo {
+  Key pawnKey, materialKey;
+  Value npMaterial[2];
+  int castleRights, rule50, pliesFromNull;
+  Score psqScore;
+  Square epSquare;
+};
+
 
 /// The position data structure. A position consists of the following data:
 ///
 ///    * For each piece type, a bitboard representing the squares occupied
 ///      by pieces of that type.
-///    * For each color, a bitboard representing the squares occupiecd by
+///    * For each color, a bitboard representing the squares occupied by
 ///      pieces of that color.
 ///    * A bitboard of all occupied squares.
 ///    * A bitboard of all checking pieces.
@@ -116,213 +85,119 @@ struct StateInfo {
 ///    * The en passant square (which is SQ_NONE if no en passant capture is
 ///      possible).
 ///    * The squares of the kings for both sides.
-///    * The last move played.
 ///    * Hash keys for the position itself, the current pawn structure, and
 ///      the current material situation.
-///    * Hash keys for all previous positions in the game (for detecting
+///    * Hash keys for all previous positions in the game for detecting
 ///      repetition draws.
 ///    * A counter for detecting 50 move rule draws.
 
 class Position {
-
-  friend class MaterialInfo;
-  friend class EndgameFunctions;
-
 public:
-  // Constructors
+  Position() {}
-  Position() {};
+  Position(const Position& p, Thread* t) { *this = p; thisThread = t; }
-  Position(const Position& pos);
+  Position(const std::string& f, bool c960, Thread* t) { from_fen(f, c960, t); }
-  Position(const std::string& fen);
+  Position& operator=(const Position&);
 
   // Text input/output
-  void from_fen(const std::string& fen);
+  void from_fen(const std::string& fen, bool isChess960, Thread* th);
   const std::string to_fen() const;
   void print(Move m = MOVE_NONE) const;
 
-  // Copying
+  // Position representation
-  void copy(const Position &pos);
+  Bitboard pieces() const;
-  void flipped_copy(const Position &pos);
+  Bitboard pieces(PieceType pt) const;
-
+  Bitboard pieces(PieceType pt1, PieceType pt2) const;
-  // The piece on a given square
+  Bitboard pieces(Color c) const;
+  Bitboard pieces(Color c, PieceType pt) const;
+  Bitboard pieces(Color c, PieceType pt1, PieceType pt2) const;
   Piece piece_on(Square s) const;
-  PieceType type_of_piece_on(Square s) const;
+  Square king_square(Color c) const;
-  Color color_of_piece_on(Square s) const;
+  Square ep_square() const;
-  bool square_is_empty(Square s) const;
+  bool is_empty(Square s) const;
-  bool square_is_occupied(Square s) const;
+  const Square* piece_list(Color c, PieceType pt) const;
-  Value midgame_value_of_piece_on(Square s) const;
-  Value endgame_value_of_piece_on(Square s) const;
-
-  // Side to move
-  Color side_to_move() const;
-
-  // Bitboard representation of the position
-  Bitboard empty_squares() const;
-  Bitboard occupied_squares() const;
-  Bitboard pieces_of_color(Color c) const;
-  Bitboard pieces_of_type(PieceType pt) const;
-  Bitboard pieces_of_color_and_type(Color c, PieceType pt) const;
-  Bitboard pawns() const;
-  Bitboard knights() const;
-  Bitboard bishops() const;
-  Bitboard rooks() const;
-  Bitboard queens() const;
-  Bitboard kings() const;
-  Bitboard rooks_and_queens() const;
-  Bitboard bishops_and_queens() const;
-  Bitboard sliders() const;
-  Bitboard pawns(Color c) const;
-  Bitboard knights(Color c) const;
-  Bitboard bishops(Color c) const;
-  Bitboard rooks(Color c) const;
-  Bitboard queens(Color c) const;
-  Bitboard kings(Color c) const;
-  Bitboard rooks_and_queens(Color c) const;
-  Bitboard bishops_and_queens(Color c) const;
-  Bitboard sliders_of_color(Color c) const;
-
-  // Number of pieces of each color and type
   int piece_count(Color c, PieceType pt) const;
 
-  // The en passant square
+  // Castling
-  Square ep_square() const;
+  int can_castle(CastleRight f) const;
+  int can_castle(Color c) const;
+  bool castle_impeded(Color c, CastlingSide s) const;
+  Square castle_rook_square(Color c, CastlingSide s) const;
 
-  // Current king position for each color
+  // Checking
-  Square king_square(Color c) const;
+  bool in_check() const;
-
-  // Castling rights
-  bool can_castle_kingside(Color c) const;
-  bool can_castle_queenside(Color c) const;
-  bool can_castle(Color c) const;
-  Square initial_kr_square(Color c) const;
-  Square initial_qr_square(Color c) const;
-
-  // Attack bitboards
-  Bitboard sliding_attacks(Square s, Direction d) const;
-  Bitboard ray_attacks(Square s, SignedDirection d) const;
-  Bitboard pawn_attacks(Color c, Square s) const;
-
-  template<PieceType>
-  Bitboard piece_attacks(Square s) const;
-
-  // Bitboards for pinned pieces and discovered check candidates
-  Bitboard discovered_check_candidates(Color c) const;
-  Bitboard pinned_pieces(Color c, Bitboard& p) const;
-  Bitboard pinned_pieces(Color c) const;
-
-  // Checking pieces
   Bitboard checkers() const;
+  Bitboard discovered_check_candidates() const;
+  Bitboard pinned_pieces() const;
 
-  // Piece lists
+  // Attacks to/from a given square
-  Square piece_list(Color c, PieceType pt, int index) const;
+  Bitboard attackers_to(Square s) const;
-
+  Bitboard attackers_to(Square s, Bitboard occ) const;
-  // Attack information for a given square
+  Bitboard attacks_from(Piece p, Square s) const;
-  bool square_is_attacked(Square s, Color c) const;
+  static Bitboard attacks_from(Piece p, Square s, Bitboard occ);
-  Bitboard attacks_to(Square s) const;
+  template<PieceType> Bitboard attacks_from(Square s) const;
-  Bitboard attacks_to(Square s, Color c) const;
+  template<PieceType> Bitboard attacks_from(Square s, Color c) const;
-  bool is_check() const;
-  bool pawn_attacks_square(Color c, Square f, Square t) const;
-
-  template<PieceType>
-  Bitboard piece_attacks_square(Square f, Square t) const; // Dispatch at compile-time
-
-  bool piece_attacks_square(Piece p, Square f, Square t) const; // Dispatch at run-time
 
   // Properties of moves
-  bool pl_move_is_legal(Move m) const;
+  bool move_gives_check(Move m, const CheckInfo& ci) const;
-  bool pl_move_is_legal(Move m, Bitboard pinned) const;
-  bool move_is_check(Move m) const;
-  bool move_is_check(Move m, Bitboard dcCandidates) const;
-  bool move_is_capture(Move m) const;
-  bool move_is_deep_pawn_push(Move m) const;
-  bool move_is_pawn_push_to_7th(Move m) const;
-  bool move_is_passed_pawn_push(Move m) const;
-  bool move_was_passed_pawn_push(Move m) const;
   bool move_attacks_square(Move m, Square s) const;
+  bool move_is_legal(const Move m) const;
+  bool pl_move_is_legal(Move m, Bitboard pinned) const;
+  bool is_pseudo_legal(const Move m) const;
+  bool is_capture(Move m) const;
+  bool is_capture_or_promotion(Move m) const;
+  bool is_passed_pawn_push(Move m) const;
+  Piece piece_moved(Move m) const;
+  PieceType captured_piece_type() const;
 
-  // Information about pawns
+  // Piece specific
   bool pawn_is_passed(Color c, Square s) const;
-  bool pawn_is_isolated(Color c, Square s) const;
+  bool pawn_on_7th(Color c) const;
-  bool pawn_is_doubled(Color c, Square s) const;
+  bool opposite_bishops() const;
-
+  bool bishop_pair(Color c) const;
-  // Open and half-open files
-  bool file_is_open(File f) const;
-  bool file_is_half_open(Color c, File f) const;
-
-  // Weak squares
-  bool square_is_weak(Square s, Color c) const;
 
   // Doing and undoing moves
-  void setStartState(const StateInfo& st);
   void do_move(Move m, StateInfo& st);
-  void do_move(Move m, StateInfo& st, Bitboard dcCandidates);
+  void do_move(Move m, StateInfo& st, const CheckInfo& ci, bool moveIsCheck);
   void undo_move(Move m);
-  void do_null_move(StateInfo& st);
+  template<bool Do> void do_null_move(StateInfo& st);
-  void undo_null_move();
 
   // Static exchange evaluation
-  int see(Square from, Square to) const;
   int see(Move m) const;
-  int see(Square to) const;
+  int see_sign(Move m) const;
 
   // Accessing hash keys
-  Key get_key() const;
+  Key key() const;
-  Key get_pawn_key() const;
+  Key exclusion_key() const;
-  Key get_material_key() const;
+  Key pawn_key() const;
+  Key material_key() const;
 
-  // Incremental evaluation
+  // Incremental piece-square evaluation
-  Value mg_value() const;
+  Score psq_score() const;
-  Value eg_value() const;
+  Score psq_delta(Piece p, Square from, Square to) const;
   Value non_pawn_material(Color c) const;
-  Phase game_phase() const;
-  Value mg_pst_delta(Move m) const;
-
-  // Game termination checks
-  bool is_mate() const;
-  bool is_draw() const;
-
-  // Check if one side threatens a mate in one
-  bool has_mate_threat(Color c);
-
-  // Number of plies since the last non-reversible move
-  int rule_50_counter() const;
 
   // Other properties of the position
-  bool opposite_colored_bishops() const;
+  Color side_to_move() const;
-  bool has_pawn_on_7th(Color c) const;
+  int startpos_ply_counter() const;
-
+  bool is_chess960() const;
-  // Reset the gamePly variable to 0
+  Thread* this_thread() const;
-  void reset_game_ply();
+  int64_t nodes_searched() const;
+  void set_nodes_searched(int64_t n);
+  template<bool SkipRepetition> bool is_draw() const;
 
   // Position consistency check, for debugging
-  bool is_ok(int* failedStep = NULL) const;
+  bool pos_is_ok(int* failedStep = NULL) const;
-
+  void flip();
-  // Static member functions:
-  static void init_zobrist();
-  static void init_piece_square_tables();
 
 private:
-
+  // Initialization helpers (used while setting up a position)
-  // Initialization helper functions (used while setting up a position)
   void clear();
   void put_piece(Piece p, Square s);
-  void allow_oo(Color c);
+  void set_castle_right(Color c, Square rfrom);
-  void allow_ooo(Color c);
 
-  // Helper functions for doing and undoing moves
+  // Helper template functions
-  void do_capture_move(PieceType capture, Color them, Square to);
+  template<bool Do> void do_castle_move(Move m);
-  void do_castle_move(Move m);
+  template<bool FindPinned> Bitboard hidden_checkers() const;
-  void do_promotion_move(Move m);
-  void do_ep_move(Move m);
-  void undo_castle_move(Move m);
-  void undo_promotion_move(Move m);
-  void undo_ep_move(Move m);
-  void find_checkers();
-
-  template<PieceType Piece>
-  void update_checkers(Bitboard* pCheckersBB, Square ksq, Square from, Square to, Bitboard dcCandidates);
-
-  template<bool FindPinned>
-  Bitboard hidden_checkers(Color c) const;
 
   // Computing hash keys from scratch (for initialization and debugging)
   Key compute_key() const;
@@ -330,183 +205,84 @@ private:
   Key compute_material_key() const;
 
   // Computing incremental evaluation scores and material counts
-  enum GamePhase {
+  Score compute_psq_score() const;
-      MidGame,
-      EndGame
-  };
-  template<GamePhase> Value pst(Color c, PieceType pt, Square s) const;
-  template<GamePhase> Value compute_value() const;
   Value compute_non_pawn_material(Color c) const;
 
-  // Bitboards
+  // Board and pieces
-  Bitboard byColorBB[2], byTypeBB[8];
+  Piece board[64];             // [square]
-
+  Bitboard byTypeBB[8];        // [pieceType]
-  // Board
+  Bitboard byColorBB[2];       // [color]
-  Piece board[64];
-
-  // Piece counts
   int pieceCount[2][8];        // [color][pieceType]
-
-  // Piece lists
   Square pieceList[2][8][16];  // [color][pieceType][index]
-  int index[64];
+  int index[64];               // [square]
 
   // Other info
-  Square kingSquare[2];
+  int castleRightsMask[64];      // [square]
-  Color sideToMove;
+  Square castleRookSquare[2][2]; // [color][side]
-  int gamePly;
+  Bitboard castlePath[2][2];     // [color][side]
-  Key history[MaxGameLength];
-  Value npMaterial[2];
-  File initialKFile, initialKRFile, initialQRFile;
   StateInfo startState;
+  int64_t nodes;
+  int startPosPly;
+  Color sideToMove;
+  Thread* thisThread;
   StateInfo* st;
-
+  int chess960;
-  // Static variables
-  static int castleRightsMask[64];
-  static Key zobrist[2][8][64];
-  static Key zobEp[64];
-  static Key zobCastle[16];
-  static Key zobMaterial[2][8][16];
-  static Key zobSideToMove;
-  static Value MgPieceSquareTable[16][64];
-  static Value EgPieceSquareTable[16][64];
 };
 
+inline int64_t Position::nodes_searched() const {
+  return nodes;
+}
 
-////
+inline void Position::set_nodes_searched(int64_t n) {
-//// Inline functions
+  nodes = n;
-////
+}
 
 inline Piece Position::piece_on(Square s) const {
   return board[s];
 }
 
-inline Color Position::color_of_piece_on(Square s) const {
+inline Piece Position::piece_moved(Move m) const {
-  return color_of_piece(piece_on(s));
+  return board[from_sq(m)];
 }
 
-inline PieceType Position::type_of_piece_on(Square s) const {
+inline bool Position::is_empty(Square s) const {
-  return type_of_piece(piece_on(s));
+  return board[s] == NO_PIECE;
-}
-
-inline bool Position::square_is_empty(Square s) const {
-  return piece_on(s) == EMPTY;
-}
-
-inline bool Position::square_is_occupied(Square s) const {
-  return !square_is_empty(s);
-}
-
-inline Value Position::midgame_value_of_piece_on(Square s) const {
-  return piece_value_midgame(piece_on(s));
-}
-
-inline Value Position::endgame_value_of_piece_on(Square s) const {
-  return piece_value_endgame(piece_on(s));
 }
 
 inline Color Position::side_to_move() const {
   return sideToMove;
 }
 
-inline Bitboard Position::occupied_squares() const {
+inline Bitboard Position::pieces() const {
-  return byTypeBB[0];
+  return byTypeBB[ALL_PIECES];
 }
 
-inline Bitboard Position::empty_squares() const {
+inline Bitboard Position::pieces(PieceType pt) const {
-  return ~(occupied_squares());
-}
-
-inline Bitboard Position::pieces_of_color(Color c) const {
-  return byColorBB[c];
-}
-
-inline Bitboard Position::pieces_of_type(PieceType pt) const {
   return byTypeBB[pt];
 }
 
-inline Bitboard Position::pieces_of_color_and_type(Color c, PieceType pt) const {
+inline Bitboard Position::pieces(PieceType pt1, PieceType pt2) const {
-  return pieces_of_color(c) & pieces_of_type(pt);
+  return byTypeBB[pt1] | byTypeBB[pt2];
 }
 
-inline Bitboard Position::pawns() const {
+inline Bitboard Position::pieces(Color c) const {
-  return pieces_of_type(PAWN);
+  return byColorBB[c];
 }
 
-inline Bitboard Position::knights() const {
+inline Bitboard Position::pieces(Color c, PieceType pt) const {
-  return pieces_of_type(KNIGHT);
+  return byColorBB[c] & byTypeBB[pt];
 }
 
-inline Bitboard Position::bishops() const {
+inline Bitboard Position::pieces(Color c, PieceType pt1, PieceType pt2) const {
-  return pieces_of_type(BISHOP);
+  return byColorBB[c] & (byTypeBB[pt1] | byTypeBB[pt2]);
-}
-
-inline Bitboard Position::rooks() const {
-  return pieces_of_type(ROOK);
-}
-
-inline Bitboard Position::queens() const {
-  return pieces_of_type(QUEEN);
-}
-
-inline Bitboard Position::kings() const {
-  return pieces_of_type(KING);
-}
-
-inline Bitboard Position::rooks_and_queens() const {
-  return rooks() | queens();
-}
-
-inline Bitboard Position::bishops_and_queens() const {
-  return bishops() | queens();
-}
-
-inline Bitboard Position::sliders() const {
-  return bishops() | queens() | rooks();
-}
-
-inline Bitboard Position::pawns(Color c) const {
-  return pieces_of_color_and_type(c, PAWN);
-}
-
-inline Bitboard Position::knights(Color c) const {
-  return pieces_of_color_and_type(c, KNIGHT);
-}
-
-inline Bitboard Position::bishops(Color c) const {
-  return pieces_of_color_and_type(c, BISHOP);
-}
-
-inline Bitboard Position::rooks(Color c) const {
-  return pieces_of_color_and_type(c, ROOK);
-}
-
-inline Bitboard Position::queens(Color c) const {
-  return pieces_of_color_and_type(c, QUEEN);
-}
-
-inline Bitboard Position::kings(Color c) const {
-  return pieces_of_color_and_type(c, KING);
-}
-
-inline Bitboard Position::rooks_and_queens(Color c) const {
-  return rooks_and_queens() & pieces_of_color(c);
-}
-
-inline Bitboard Position::bishops_and_queens(Color c) const {
-  return bishops_and_queens() & pieces_of_color(c);
-}
-
-inline Bitboard Position::sliders_of_color(Color c) const {
-  return sliders() & pieces_of_color(c);
 }
 
 inline int Position::piece_count(Color c, PieceType pt) const {
   return pieceCount[c][pt];
 }
 
-inline Square Position::piece_list(Color c, PieceType pt, int index) const {
+inline const Square* Position::piece_list(Color c, PieceType pt) const {
-  return pieceList[c][pt][index];
+  return pieceList[c][pt];
 }
 
 inline Square Position::ep_square() const {
@@ -514,218 +290,144 @@ inline Square Position::ep_square() const {
 }
 
 inline Square Position::king_square(Color c) const {
-  return kingSquare[c];
+  return pieceList[c][KING][0];
 }
 
-inline bool Position::can_castle_kingside(Color side) const {
+inline int Position::can_castle(CastleRight f) const {
-  return st->castleRights & (1+int(side));
+  return st->castleRights & f;
 }
 
-inline bool Position::can_castle_queenside(Color side) const {
+inline int Position::can_castle(Color c) const {
-  return st->castleRights & (4+4*int(side));
+  return st->castleRights & ((WHITE_OO | WHITE_OOO) << (2 * c));
 }
 
-inline bool Position::can_castle(Color side) const {
+inline bool Position::castle_impeded(Color c, CastlingSide s) const {
-  return can_castle_kingside(side) || can_castle_queenside(side);
+  return byTypeBB[ALL_PIECES] & castlePath[c][s];
 }
 
-inline Square Position::initial_kr_square(Color c) const {
+inline Square Position::castle_rook_square(Color c, CastlingSide s) const {
-  return relative_square(c, make_square(initialKRFile, RANK_1));
+  return castleRookSquare[c][s];
 }
 
-inline Square Position::initial_qr_square(Color c) const {
+template<PieceType Pt>
-  return relative_square(c, make_square(initialQRFile, RANK_1));
+inline Bitboard Position::attacks_from(Square s) const {
-}
 
-inline Bitboard Position::pawn_attacks(Color c, Square s) const {
+  return  Pt == BISHOP || Pt == ROOK ? attacks_bb<Pt>(s, pieces())
-  return StepAttackBB[piece_of_color_and_type(c, PAWN)][s];
+        : Pt == QUEEN  ? attacks_from<ROOK>(s) | attacks_from<BISHOP>(s)
+        : StepAttacksBB[Pt][s];
 }
 
 template<>
-inline Bitboard Position::piece_attacks<PAWN>(Square s) const {
+inline Bitboard Position::attacks_from<PAWN>(Square s, Color c) const {
-  return StepAttackBB[piece_of_color_and_type(opposite_color(sideToMove), PAWN)][s];
+  return StepAttacksBB[make_piece(c, PAWN)][s];
 }
 
-template<>
+inline Bitboard Position::attacks_from(Piece p, Square s) const {
-inline Bitboard Position::piece_attacks<KNIGHT>(Square s) const {
+  return attacks_from(p, s, byTypeBB[ALL_PIECES]);
-  return StepAttackBB[KNIGHT][s];
 }
 
-template<>
+inline Bitboard Position::attackers_to(Square s) const {
-inline Bitboard Position::piece_attacks<BISHOP>(Square s) const {
+  return attackers_to(s, byTypeBB[ALL_PIECES]);
-  return bishop_attacks_bb(s, occupied_squares());
-}
-
-template<>
-inline Bitboard Position::piece_attacks<ROOK>(Square s) const {
-  return rook_attacks_bb(s, occupied_squares());
-}
-
-template<>
-inline Bitboard Position::piece_attacks<QUEEN>(Square s) const {
-  return piece_attacks<ROOK>(s) | piece_attacks<BISHOP>(s);
-}
-
-template<>
-inline Bitboard Position::piece_attacks<KING>(Square s) const {
-  return StepAttackBB[KING][s];
 }
 
 inline Bitboard Position::checkers() const {
   return st->checkersBB;
 }
 
-inline bool Position::is_check() const {
+inline bool Position::in_check() const {
-  return st->checkersBB != EmptyBoardBB;
+  return st->checkersBB != 0;
 }
 
-inline bool Position::pawn_attacks_square(Color c, Square f, Square t) const {
+inline Bitboard Position::discovered_check_candidates() const {
-  return bit_is_set(pawn_attacks(c, f), t);
+  return hidden_checkers<false>();
 }
 
-template<PieceType Piece>
+inline Bitboard Position::pinned_pieces() const {
-Bitboard Position::piece_attacks_square(Square f, Square t) const {
+  return hidden_checkers<true>();
-  return bit_is_set(piece_attacks<Piece>(f), t);
-}
-
-inline Bitboard Position::attacks_to(Square s, Color c) const {
-
-  return attacks_to(s) & pieces_of_color(c);
-}
-
-inline bool Position::square_is_attacked(Square s, Color c) const {
-
-  return attacks_to(s, c) != EmptyBoardBB;
 }
 
 inline bool Position::pawn_is_passed(Color c, Square s) const {
-  return !(pawns(opposite_color(c)) & passed_pawn_mask(c, s));
+  return !(pieces(~c, PAWN) & passed_pawn_mask(c, s));
 }
 
-inline bool Position::pawn_is_isolated(Color c, Square s) const {
+inline Key Position::key() const {
-  return !(pawns(c) & neighboring_files_bb(s));
-}
-
-inline bool Position::pawn_is_doubled(Color c, Square s) const {
-  return pawns(c) & squares_behind(c, s);
-}
-
-inline bool Position::file_is_open(File f) const {
-  return !(pawns() & file_bb(f));
-}
-
-inline bool Position::file_is_half_open(Color c, File f) const {
-  return !(pawns(c) & file_bb(f));
-}
-
-inline bool Position::square_is_weak(Square s, Color c) const {
-  return !(pawns(c) & outpost_mask(opposite_color(c), s));
-}
-
-inline Key Position::get_key() const {
   return st->key;
 }
 
-inline Key Position::get_pawn_key() const {
+inline Key Position::exclusion_key() const {
+  return st->key ^ Zobrist::exclusion;
+}
+
+inline Key Position::pawn_key() const {
   return st->pawnKey;
 }
 
-inline Key Position::get_material_key() const {
+inline Key Position::material_key() const {
   return st->materialKey;
 }
 
-template<Position::GamePhase Phase>
+inline Score Position::psq_delta(Piece p, Square from, Square to) const {
-inline Value Position::pst(Color c, PieceType pt, Square s) const {
+  return pieceSquareTable[p][to] - pieceSquareTable[p][from];
-  return (Phase == MidGame ? MgPieceSquareTable[piece_of_color_and_type(c, pt)][s]
-                           : EgPieceSquareTable[piece_of_color_and_type(c, pt)][s]);
 }
 
-inline Value Position::mg_pst_delta(Move m) const {
+inline Score Position::psq_score() const {
-  return MgPieceSquareTable[piece_on(move_from(m))][move_to(m)]
+  return st->psqScore;
-        -MgPieceSquareTable[piece_on(move_from(m))][move_from(m)];
-}
-
-inline Value Position::mg_value() const {
-  return st->mgValue;
-}
-
-inline Value Position::eg_value() const {
-  return st->egValue;
 }
 
 inline Value Position::non_pawn_material(Color c) const {
-  return npMaterial[c];
+  return st->npMaterial[c];
 }
 
-inline Phase Position::game_phase() const {
+inline bool Position::is_passed_pawn_push(Move m) const {
 
-  // Values modified by Joona Kiiski
+  return   type_of(piece_moved(m)) == PAWN
-  static const Value MidgameLimit = Value(15713);
+        && pawn_is_passed(sideToMove, to_sq(m));
-  static const Value EndgameLimit = Value(4428);
-
-  Value npm = non_pawn_material(WHITE) + non_pawn_material(BLACK);
-
-  if (npm >= MidgameLimit)
-      return PHASE_MIDGAME;
-  else if(npm <= EndgameLimit)
-      return PHASE_ENDGAME;
-  else
-      return Phase(((npm - EndgameLimit) * 128) / (MidgameLimit - EndgameLimit));
 }
 
-inline bool Position::move_is_deep_pawn_push(Move m) const {
+inline int Position::startpos_ply_counter() const {
-
+  return startPosPly + st->pliesFromNull; // HACK
-  Color c = side_to_move();
-  return   piece_on(move_from(m)) == piece_of_color_and_type(c, PAWN)
-        && relative_rank(c, move_to(m)) > RANK_4;
 }
 
-inline bool Position::move_is_pawn_push_to_7th(Move m) const {
+inline bool Position::opposite_bishops() const {
 
-  Color c = side_to_move();
+  return   pieceCount[WHITE][BISHOP] == 1
-  return   piece_on(move_from(m)) == piece_of_color_and_type(c, PAWN)
+        && pieceCount[BLACK][BISHOP] == 1
-        && relative_rank(c, move_to(m)) == RANK_7;
+        && opposite_colors(pieceList[WHITE][BISHOP][0], pieceList[BLACK][BISHOP][0]);
 }
 
-inline bool Position::move_is_passed_pawn_push(Move m) const {
+inline bool Position::bishop_pair(Color c) const {
 
-  Color c = side_to_move();
+  return   pieceCount[c][BISHOP] >= 2
-  return   piece_on(move_from(m)) == piece_of_color_and_type(c, PAWN)
+        && opposite_colors(pieceList[c][BISHOP][0], pieceList[c][BISHOP][1]);
-        && pawn_is_passed(c, move_to(m));
 }
 
-inline bool Position::move_was_passed_pawn_push(Move m) const {
+inline bool Position::pawn_on_7th(Color c) const {
-
+  return pieces(c, PAWN) & rank_bb(relative_rank(c, RANK_7));
-  Color c = opposite_color(side_to_move());
-  return   piece_on(move_to(m)) == piece_of_color_and_type(c, PAWN)
-        && pawn_is_passed(c, move_to(m));
 }
 
-inline int Position::rule_50_counter() const {
+inline bool Position::is_chess960() const {
-
+  return chess960;
-  return st->rule50;
 }
 
-inline bool Position::opposite_colored_bishops() const {
+inline bool Position::is_capture_or_promotion(Move m) const {
 
-  return   piece_count(WHITE, BISHOP) == 1
+  assert(is_ok(m));
-        && piece_count(BLACK, BISHOP) == 1
+  return type_of(m) ? type_of(m) != CASTLE : !is_empty(to_sq(m));
-        && square_color(piece_list(WHITE, BISHOP, 0)) != square_color(piece_list(BLACK, BISHOP, 0));
 }
 
-inline bool Position::has_pawn_on_7th(Color c) const {
+inline bool Position::is_capture(Move m) const {
 
-  return pawns(c) & relative_rank_bb(c, RANK_7);
+  // Note that castle is coded as "king captures the rook"
+  assert(is_ok(m));
+  return (!is_empty(to_sq(m)) && type_of(m) != CASTLE) || type_of(m) == ENPASSANT;
 }
 
-inline bool Position::move_is_capture(Move m) const {
+inline PieceType Position::captured_piece_type() const {
+  return st->capturedType;
+}
 
-  // Move must not be MOVE_NONE !
+inline Thread* Position::this_thread() const {
-
+  return thisThread;
-  return (   !square_is_empty(move_to(m))
-          && (color_of_piece_on(move_to(m)) != color_of_piece_on(move_from(m)))
-         )
-         || move_is_ep(m);
 }
 
 #endif // !defined(POSITION_H_INCLUDED)

src/psqtab.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,172 +17,82 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(PSQTAB_H_INCLUDED)
 #define PSQTAB_H_INCLUDED
 
-////
+#include "types.h"
-//// Includes
-////
 
-#include "value.h"
+#define S(mg, eg) make_score(mg, eg)
 
 
-////
+/// PSQT[PieceType][Square] contains Piece-Square scores. For each piece type on
-//// Variables
+/// a given square a (midgame, endgame) score pair is assigned. PSQT is defined
-////
+/// for white side, for black side the tables are symmetric.
 
-static const Value MP = PawnValueMidgame;
+static const Score PSQT[][64] = {
-static const Value MK = KnightValueMidgame;
-static const Value MB = BishopValueMidgame;
-static const Value MR = RookValueMidgame;
-static const Value MQ = QueenValueMidgame;
-
-static const int MgPST[][64] = {
   { },
   { // Pawn
-   // A      B      C      D      E      F      G      H
+   S(  0, 0), S( 0, 0), S( 0, 0), S( 0, 0), S(0,  0), S( 0, 0), S( 0, 0), S(  0, 0),
-        0,     0,     0,     0,     0,     0,     0,     0,
+   S(-28,-8), S(-6,-8), S( 4,-8), S(14,-8), S(14,-8), S( 4,-8), S(-6,-8), S(-28,-8),
-    MP-38, MP-12, MP- 0, MP+12, MP+12, MP- 0, MP-12, MP-38,
+   S(-28,-8), S(-6,-8), S( 9,-8), S(36,-8), S(36,-8), S( 9,-8), S(-6,-8), S(-28,-8),
-    MP-38, MP-12, MP+ 6, MP+38, MP+38, MP+ 6, MP-12, MP-38,
+   S(-28,-8), S(-6,-8), S(17,-8), S(58,-8), S(58,-8), S(17,-8), S(-6,-8), S(-28,-8),
-    MP-38, MP-12, MP+16, MP+64, MP+64, MP+16, MP-12, MP-38,
+   S(-28,-8), S(-6,-8), S(17,-8), S(36,-8), S(36,-8), S(17,-8), S(-6,-8), S(-28,-8),
-    MP-38, MP-12, MP+16, MP+38, MP+38, MP+16, MP-12, MP-38,
+   S(-28,-8), S(-6,-8), S( 9,-8), S(14,-8), S(14,-8), S( 9,-8), S(-6,-8), S(-28,-8),
-    MP-38, MP-12, MP+ 6, MP+12, MP+12, MP+ 6, MP-12, MP-38,
+   S(-28,-8), S(-6,-8), S( 4,-8), S(14,-8), S(14,-8), S( 4,-8), S(-6,-8), S(-28,-8),
-    MP-38, MP-12, MP- 0, MP+12, MP+12, MP- 0, MP-12, MP-38,
+   S(  0, 0), S( 0, 0), S( 0, 0), S( 0, 0), S(0,  0), S( 0, 0), S( 0, 0), S(  0, 0)
-        0,     0,     0,     0,     0,     0,     0,     0
   },
   { // Knight
-   //  A      B       C      D      E      F      G       H
+   S(-135,-104), S(-107,-79), S(-80,-55), S(-67,-42), S(-67,-42), S(-80,-55), S(-107,-79), S(-135,-104),
-    MK-128, MK-102, MK-76, MK-64, MK-64, MK-76, MK-102, MK-128,
+   S( -93, -79), S( -67,-55), S(-39,-30), S(-25,-17), S(-25,-17), S(-39,-30), S( -67,-55), S( -93, -79),
-    MK- 89, MK- 64, MK-38, MK-25, MK-25, MK-38, MK- 64, MK- 89,
+   S( -53, -55), S( -25,-30), S(  1, -6), S( 13,  5), S( 13,  5), S(  1, -6), S( -25,-30), S( -53, -55),
-    MK- 51, MK- 25, MK- 0, MK+12, MK+12, MK- 0, MK- 25, MK- 51,
+   S( -25, -42), S(   1,-17), S( 27,  5), S( 41, 18), S( 41, 18), S( 27,  5), S(   1,-17), S( -25, -42),
-    MK- 25, MK-  0, MK+25, MK+38, MK+38, MK+25, MK-  0, MK- 25,
+   S( -11, -42), S(  13,-17), S( 41,  5), S( 55, 18), S( 55, 18), S( 41,  5), S(  13,-17), S( -11, -42),
-    MK- 12, MK+ 12, MK+38, MK+51, MK+51, MK+38, MK+ 12, MK- 12,
+   S( -11, -55), S(  13,-30), S( 41, -6), S( 55,  5), S( 55,  5), S( 41, -6), S(  13,-30), S( -11, -55),
-    MK- 12, MK+ 12, MK+38, MK+51, MK+51, MK+38, MK+ 12, MK- 12,
+   S( -53, -79), S( -25,-55), S(  1,-30), S( 13,-17), S( 13,-17), S(  1,-30), S( -25,-55), S( -53, -79),
-    MK- 51, MK- 25, MK- 0, MK+12, MK+12, MK- 0, MK- 25, MK- 51,
+   S(-193,-104), S( -67,-79), S(-39,-55), S(-25,-42), S(-25,-42), S(-39,-55), S( -67,-79), S(-193,-104)
-    MK-182, MK- 64, MK-38, MK-25, MK-25, MK-38, MK- 64, MK-182
   },
   { // Bishop
-   // A      B      C      D      E      F      G      H
+   S(-40,-59), S(-40,-42), S(-35,-35), S(-30,-26), S(-30,-26), S(-35,-35), S(-40,-42), S(-40,-59),
-    MB-46, MB-46, MB-40, MB-35, MB-35, MB-40, MB-46, MB-46,
+   S(-17,-42), S(  0,-26), S( -4,-18), S(  0,-11), S(  0,-11), S( -4,-18), S(  0,-26), S(-17,-42),
-    MB-20, MB- 0, MB- 5, MB- 0, MB- 0, MB- 5, MB- 0, MB-20,
+   S(-13,-35), S( -4,-18), S(  8,-11), S(  4, -4), S(  4, -4), S(  8,-11), S( -4,-18), S(-13,-35),
-    MB-15, MB- 5, MB+10, MB+ 5, MB+ 5, MB+10, MB- 5, MB-15,
+   S( -8,-26), S(  0,-11), S(  4, -4), S( 17,  4), S( 17,  4), S(  4, -4), S(  0,-11), S( -8,-26),
-    MB-10, MB- 0, MB+ 5, MB+20, MB+20, MB+ 5, MB- 0, MB-10,
+   S( -8,-26), S(  0,-11), S(  4, -4), S( 17,  4), S( 17,  4), S(  4, -4), S(  0,-11), S( -8,-26),
-    MB-10, MB- 0, MB+ 5, MB+20, MB+20, MB+ 5, MB- 0, MB-10,
+   S(-13,-35), S( -4,-18), S(  8,-11), S(  4, -4), S(  4, -4), S(  8,-11), S( -4,-18), S(-13,-35),
-    MB-15, MB- 5, MB+10, MB+ 5, MB+ 5, MB+10, MB- 5, MB-15,
+   S(-17,-42), S(  0,-26), S( -4,-18), S(  0,-11), S(  0,-11), S( -4,-18), S(  0,-26), S(-17,-42),
-    MB-20, MB- 0, MB- 5, MB- 0, MB- 0, MB- 5, MB- 0, MB-20,
+   S(-17,-59), S(-17,-42), S(-13,-35), S( -8,-26), S( -8,-26), S(-13,-35), S(-17,-42), S(-17,-59)
-    MB-20, MB-20, MB-15, MB-10, MB-10, MB-15, MB-20, MB-20
   },
   { // Rook
-   // A      B      C     D     E     F     G      H
+   S(-12, 3), S(-7, 3), S(-2, 3), S(2, 3), S(2, 3), S(-2, 3), S(-7, 3), S(-12, 3),
-    MR-18, MR-10, MR-3, MR+4, MR+4, MR-3, MR-10, MR-18,
+   S(-12, 3), S(-7, 3), S(-2, 3), S(2, 3), S(2, 3), S(-2, 3), S(-7, 3), S(-12, 3),
-    MR-18, MR-10, MR-3, MR+4, MR+4, MR-3, MR-10, MR-18,
+   S(-12, 3), S(-7, 3), S(-2, 3), S(2, 3), S(2, 3), S(-2, 3), S(-7, 3), S(-12, 3),
-    MR-18, MR-10, MR-3, MR+4, MR+4, MR-3, MR-10, MR-18,
+   S(-12, 3), S(-7, 3), S(-2, 3), S(2, 3), S(2, 3), S(-2, 3), S(-7, 3), S(-12, 3),
-    MR-18, MR-10, MR-3, MR+4, MR+4, MR-3, MR-10, MR-18,
+   S(-12, 3), S(-7, 3), S(-2, 3), S(2, 3), S(2, 3), S(-2, 3), S(-7, 3), S(-12, 3),
-    MR-18, MR-10, MR-3, MR+4, MR+4, MR-3, MR-10, MR-18,
+   S(-12, 3), S(-7, 3), S(-2, 3), S(2, 3), S(2, 3), S(-2, 3), S(-7, 3), S(-12, 3),
-    MR-18, MR-10, MR-3, MR+4, MR+4, MR-3, MR-10, MR-18,
+   S(-12, 3), S(-7, 3), S(-2, 3), S(2, 3), S(2, 3), S(-2, 3), S(-7, 3), S(-12, 3),
-    MR-18, MR-10, MR-3, MR+4, MR+4, MR-3, MR-10, MR-18,
+   S(-12, 3), S(-7, 3), S(-2, 3), S(2, 3), S(2, 3), S(-2, 3), S(-7, 3), S(-12, 3)
-    MR-18, MR-10, MR-3, MR+4, MR+4, MR-3, MR-10, MR-18
   },
   { // Queen
-   //A   B   C   D   E   F   G   H
+   S(8,-80), S(8,-54), S(8,-42), S(8,-30), S(8,-30), S(8,-42), S(8,-54), S(8,-80),
-    MQ, MQ, MQ, MQ, MQ, MQ, MQ, MQ,
+   S(8,-54), S(8,-30), S(8,-18), S(8, -6), S(8, -6), S(8,-18), S(8,-30), S(8,-54),
-    MQ, MQ, MQ, MQ, MQ, MQ, MQ, MQ,
+   S(8,-42), S(8,-18), S(8, -6), S(8,  6), S(8,  6), S(8, -6), S(8,-18), S(8,-42),
-    MQ, MQ, MQ, MQ, MQ, MQ, MQ, MQ,
+   S(8,-30), S(8, -6), S(8,  6), S(8, 18), S(8, 18), S(8,  6), S(8, -6), S(8,-30),
-    MQ, MQ, MQ, MQ, MQ, MQ, MQ, MQ,
+   S(8,-30), S(8, -6), S(8,  6), S(8, 18), S(8, 18), S(8,  6), S(8, -6), S(8,-30),
-    MQ, MQ, MQ, MQ, MQ, MQ, MQ, MQ,
+   S(8,-42), S(8,-18), S(8, -6), S(8,  6), S(8,  6), S(8, -6), S(8,-18), S(8,-42),
-    MQ, MQ, MQ, MQ, MQ, MQ, MQ, MQ,
+   S(8,-54), S(8,-30), S(8,-18), S(8, -6), S(8, -6), S(8,-18), S(8,-30), S(8,-54),
-    MQ, MQ, MQ, MQ, MQ, MQ, MQ, MQ,
+   S(8,-80), S(8,-54), S(8,-42), S(8,-30), S(8,-30), S(8,-42), S(8,-54), S(8,-80)
-    MQ, MQ, MQ, MQ, MQ, MQ, MQ, MQ
   },
   { // King
-   //A    B    C    D    E    F    G    H
+   S(287, 18), S(311, 77), S(262,105), S(214,135), S(214,135), S(262,105), S(311, 77), S(287, 18),
-    302, 328, 276, 225, 225, 276, 328, 302,
+   S(262, 77), S(287,135), S(238,165), S(190,193), S(190,193), S(238,165), S(287,135), S(262, 77),
-    276, 302, 251, 200, 200, 251, 302, 276,
+   S(214,105), S(238,165), S(190,193), S(142,222), S(142,222), S(190,193), S(238,165), S(214,105),
-    225, 251, 200, 149, 149, 200, 251, 225,
+   S(190,135), S(214,193), S(167,222), S(119,251), S(119,251), S(167,222), S(214,193), S(190,135),
-    200, 225, 175, 124, 124, 175, 225, 200,
+   S(167,135), S(190,193), S(142,222), S( 94,251), S( 94,251), S(142,222), S(190,193), S(167,135),
-    175, 200, 149,  98,  98, 149, 200, 175,
+   S(142,105), S(167,165), S(119,193), S( 69,222), S( 69,222), S(119,193), S(167,165), S(142,105),
-    149, 175, 124,  72,  72, 124, 175, 149,
+   S(119, 77), S(142,135), S( 94,165), S( 46,193), S( 46,193), S( 94,165), S(142,135), S(119, 77),
-    124, 149,  98,  47,  47,  98, 149, 124,
+   S(94,  18), S(119, 77), S( 69,105), S( 21,135), S( 21,135), S( 69,105), S(119, 77), S( 94, 18)
-     98, 124,  72,  21,  21,  72, 124,  98
-  }
-};
-
-static const Value EP = PawnValueEndgame;
-static const Value EK = KnightValueEndgame;
-static const Value EB = BishopValueEndgame;
-static const Value ER = RookValueEndgame;
-static const Value EQ = QueenValueEndgame;
-
-static const int EgPST[][64] = {
-  { },
-  {// Pawn
-   //A   B   C   D   E   F   G   H
-     0,  0,  0,  0,  0,  0,  0,  0,
-    EP, EP, EP, EP, EP, EP, EP, EP,
-    EP, EP, EP, EP, EP, EP, EP, EP,
-    EP, EP, EP, EP, EP, EP, EP, EP,
-    EP, EP, EP, EP, EP, EP, EP, EP,
-    EP, EP, EP, EP, EP, EP, EP, EP,
-    EP, EP, EP, EP, EP, EP, EP, EP,
-     0,  0,  0,  0,  0,  0,  0,  0
-  },
-  {// Knight
-   // A       B      C      D      E      F      G      H
-    EK-102, EK-76, EK-51, EK-38, EK-38, EK-51, EK-76, EK-102,
-    EK- 76, EK-51, EK-25, EK-12, EK-12, EK-25, EK-51, EK-76,
-    EK- 51, EK-25, EK- 0, EK+12, EK+12, EK- 0, EK-25, EK-51,
-    EK- 38, EK-12, EK+12, EK+25, EK+25, EK+12, EK-12, EK-38,
-    EK- 38, EK-12, EK+12, EK+25, EK+25, EK+12, EK-12, EK-38,
-    EK- 51, EK-25, EK- 0, EK+12, EK+12, EK- 0, EK-25, EK-51,
-    EK- 76, EK-51, EK-25, EK-12, EK-12, EK-25, EK-51, EK-76,
-    EK-102, EK-76, EK-51, EK-38, EK-38, EK-51, EK-76, EK-102
-  },
-  {// Bishop
-   // A      B      C      D      E      F      G      H
-    EB-46, EB-30, EB-23, EB-15, EB-15, EB-23, EB-30, EB-46,
-    EB-30, EB-15, EB- 7, EB- 0, EB- 0, EB- 7, EB-15, EB-30,
-    EB-23, EB- 7, EB- 0, EB+ 7, EB+ 7, EB- 0, EB- 7, EB-23,
-    EB-15, EB- 0, EB+ 7, EB+15, EB+15, EB+ 7, EB- 0, EB-15,
-    EB-15, EB- 0, EB+ 7, EB+15, EB+15, EB+ 7, EB- 0, EB-15,
-    EB-23, EB- 7, EB- 0, EB+ 7, EB+ 7, EB- 0, EB- 7, EB-23,
-    EB-30, EB-15, EB- 7, EB- 0, EB- 0, EB- 7, EB-15, EB-30,
-    EB-46, EB-30, EB-23, EB-15, EB-15, EB-23, EB-30, EB-46
-  },
-  {// Rook
-   // A     B     C     D     E     F     G     H
-    ER-3, ER-3, ER-3, ER-3, ER-3, ER-3, ER-3, ER-3,
-    ER-3, ER-3, ER-3, ER-3, ER-3, ER-3, ER-3, ER-3,
-    ER-3, ER-3, ER-3, ER-3, ER-3, ER-3, ER-3, ER-3,
-    ER-3, ER-3, ER-3, ER-3, ER-3, ER-3, ER-3, ER-3,
-    ER-3, ER-3, ER-3, ER-3, ER-3, ER-3, ER-3, ER-3,
-    ER-3, ER-3, ER-3, ER-3, ER-3, ER-3, ER-3, ER-3,
-    ER-3, ER-3, ER-3, ER-3, ER-3, ER-3, ER-3, ER-3,
-    ER-3, ER-3, ER-3, ER-3, ER-3, ER-3, ER-3, ER-3
-  },
-  {// Queen
-   // A      B      C      D      E      F      G      H
-    EQ-61, EQ-40, EQ-30, EQ-20, EQ-20, EQ-30, EQ-40, EQ-61,
-    EQ-40, EQ-20, EQ-10, EQ- 0, EQ- 0, EQ-10, EQ-20, EQ-40,
-    EQ-30, EQ-10, EQ- 0, EQ+10, EQ+10, EQ- 0, EQ-10, EQ-30,
-    EQ-20, EQ- 0, EQ+10, EQ+20, EQ+20, EQ+10, EQ- 0, EQ-20,
-    EQ-20, EQ- 0, EQ+10, EQ+20, EQ+20, EQ+10, EQ- 0, EQ-20,
-    EQ-30, EQ-10, EQ- 0, EQ+10, EQ+10, EQ- 0, EQ-10, EQ-30,
-    EQ-40, EQ-20, EQ-10, EQ- 0, EQ- 0, EQ-10, EQ-20, EQ-40,
-    EQ-61, EQ-40, EQ-30, EQ-20, EQ-20, EQ-30, EQ-40, EQ-61
-  },
-  {// King
-   //A    B    C    D    E    F    G    H
-     16,  78, 108, 139, 139, 108,  78,  16,
-     78, 139, 170, 200, 200, 170, 139,  78,
-    108, 170, 200, 230, 230, 200, 170, 108,
-    139, 200, 230, 261, 261, 230, 200, 139,
-    139, 200, 230, 261, 261, 230, 200, 139,
-    108, 170, 200, 230, 230, 200, 170, 108,
-     78, 139, 170, 200, 200, 170, 139,  78,
-     16,  78, 108, 139, 139, 108,  78,  16
   }
 };
 
+#undef S
 
 #endif // !defined(PSQTAB_H_INCLUDED)

src/rkiss.h

@@ -0,0 +1,78 @@
+/*
+  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
+  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
+
+  Stockfish is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  Stockfish is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+  This file is based on original code by Heinz van Saanen and is
+  available under the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+*/
+
+#if !defined(RKISS_H_INCLUDED)
+#define RKISS_H_INCLUDED
+
+#include "types.h"
+
+/// RKISS is our pseudo random number generator (PRNG) used to compute hash keys.
+/// George Marsaglia invented the RNG-Kiss-family in the early 90's. This is a
+/// specific version that Heinz van Saanen derived from some public domain code
+/// by Bob Jenkins. Following the feature list, as tested by Heinz.
+///
+/// - Quite platform independent
+/// - Passes ALL dieharder tests! Here *nix sys-rand() e.g. fails miserably:-)
+/// - ~12 times faster than my *nix sys-rand()
+/// - ~4 times faster than SSE2-version of Mersenne twister
+/// - Average cycle length: ~2^126
+/// - 64 bit seed
+/// - Return doubles with a full 53 bit mantissa
+/// - Thread safe
+
+class RKISS {
+
+  // Keep variables always together
+  struct S { uint64_t a, b, c, d; } s;
+
+  uint64_t rotate(uint64_t x, uint64_t k) const {
+    return (x << k) | (x >> (64 - k));
+  }
+
+  // Return 64 bit unsigned integer in between [0, 2^64 - 1]
+  uint64_t rand64() {
+
+    const uint64_t
+      e = s.a - rotate(s.b,  7);
+    s.a = s.b ^ rotate(s.c, 13);
+    s.b = s.c + rotate(s.d, 37);
+    s.c = s.d + e;
+    return s.d = e + s.a;
+  }
+
+  // Init seed and scramble a few rounds
+  void raninit() {
+
+    s.a = 0xf1ea5eed;
+    s.b = s.c = s.d = 0xd4e12c77;
+    for (int i = 0; i < 73; i++)
+        rand64();
+  }
+
+public:
+  RKISS() { raninit(); }
+  template<typename T> T rand() { return T(rand64()); }
+};
+
+#endif // !defined(RKISS_H_INCLUDED)

src/san.cpp

@@ -1,435 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-////
-//// Includes
-////
-
-#include <cassert>
-#include <cstring>
-#include <iomanip>
-#include <string>
-#include <sstream>
-
-#include "movepick.h"
-#include "san.h"
-
-extern SearchStack EmptySearchStack;
-
-////
-//// Local definitions
-////
-
-namespace {
-
-  /// Types
-
-  enum Ambiguity {
-    AMBIGUITY_NONE,
-    AMBIGUITY_FILE,
-    AMBIGUITY_RANK,
-    AMBIGUITY_BOTH
-  };
-
-
-  /// Functions
-
-  Ambiguity move_ambiguity(const Position& pos, Move m);
-  const std::string time_string(int milliseconds);
-  const std::string score_string(Value v);
-}
-
-
-////
-//// Functions
-////
-
-/// move_to_san() takes a position and a move as input, where it is assumed
-/// that the move is a legal move from the position. The return value is
-/// a string containing the move in short algebraic notation.
-
-const std::string move_to_san(const Position& pos, Move m) {
-
-  assert(pos.is_ok());
-  assert(move_is_ok(m));
-
-  Square from, to;
-  PieceType pt;
-
-  from = move_from(m);
-  to = move_to(m);
-  pt = type_of_piece(pos.piece_on(move_from(m)));
-
-  std::string san = "";
-
-  if (m == MOVE_NONE)
-      return "(none)";
-  else if (m == MOVE_NULL)
-      return "(null)";
-  else if (move_is_long_castle(m) || (int(to - from) == -2 && pt == KING))
-      san = "O-O-O";
-  else if (move_is_short_castle(m) || (int(to - from) == 2 && pt == KING))
-      san = "O-O";
-  else
-  {
-      if (pt != PAWN)
-      {
-          san += piece_type_to_char(pt, true);
-          switch (move_ambiguity(pos, m)) {
-          case AMBIGUITY_NONE:
-            break;
-          case AMBIGUITY_FILE:
-            san += file_to_char(square_file(from));
-            break;
-          case AMBIGUITY_RANK:
-            san += rank_to_char(square_rank(from));
-            break;
-          case AMBIGUITY_BOTH:
-            san += square_to_string(from);
-            break;
-          default:
-            assert(false);
-          }
-      }
-      if (pos.move_is_capture(m))
-      {
-          if (pt == PAWN)
-              san += file_to_char(square_file(move_from(m)));
-          san += "x";
-      }
-      san += square_to_string(move_to(m));
-      if (move_promotion(m))
-      {
-          san += '=';
-          san += piece_type_to_char(move_promotion(m), true);
-      }
-  }
-  // Is the move check?  We don't use pos.move_is_check(m) here, because
-  // Position::move_is_check doesn't detect all checks (not castling moves,
-  // promotions and en passant captures).
-  StateInfo st;
-  Position p(pos);
-  p.do_move(m, st);
-  if (p.is_check())
-      san += p.is_mate()? "#" : "+";
-
-  return san;
-}
-
-
-/// move_from_san() takes a position and a string as input, and tries to
-/// interpret the string as a move in short algebraic notation. On success,
-/// the move is returned.  On failure (i.e. if the string is unparsable, or
-/// if the move is illegal or ambiguous), MOVE_NONE is returned.
-
-Move move_from_san(const Position& pos, const std::string& movestr) {
-
-  assert(pos.is_ok());
-
-  MovePicker mp = MovePicker(pos, false, MOVE_NONE, EmptySearchStack, OnePly);
-
-  // Castling moves
-  if (movestr == "O-O-O" || movestr == "O-O-O+")
-  {
-      Move m;
-      while ((m = mp.get_next_move()) != MOVE_NONE)
-          if (move_is_long_castle(m) && pos.pl_move_is_legal(m))
-              return m;
-
-      return MOVE_NONE;
-  }
-  else if (movestr == "O-O" || movestr == "O-O+")
-  {
-      Move m;
-      while ((m = mp.get_next_move()) != MOVE_NONE)
-          if (move_is_short_castle(m) && pos.pl_move_is_legal(m))
-              return m;
-
-    return MOVE_NONE;
-  }
-
-  // Normal moves. We use a simple FSM to parse the san string.
-  enum { START, TO_FILE, TO_RANK, PROMOTION_OR_CHECK, PROMOTION, CHECK, END };
-  static const std::string pieceLetters = "KQRBN";
-  PieceType pt = NO_PIECE_TYPE, promotion = NO_PIECE_TYPE;
-  File fromFile = FILE_NONE, toFile = FILE_NONE;
-  Rank fromRank = RANK_NONE, toRank = RANK_NONE;
-  Square to;
-  int state = START;
-
-  for (size_t i = 0; i < movestr.length(); i++)
-  {
-      char type, c = movestr[i];
-      if (pieceLetters.find(c) != std::string::npos)
-          type = 'P';
-      else if (c >= 'a' && c <= 'h')
-          type = 'F';
-      else if (c >= '1' && c <= '8')
-          type = 'R';
-      else
-          type = c;
-
-      switch (type) {
-      case 'P':
-          if (state == START)
-          {
-              pt = piece_type_from_char(c);
-              state = TO_FILE;
-          }
-          else if (state == PROMOTION)
-          {
-              promotion = piece_type_from_char(c);
-              state = (i < movestr.length() - 1) ? CHECK : END;
-          }
-          else
-              return MOVE_NONE;
-          break;
-      case 'F':
-          if (state == START)
-          {
-              pt = PAWN;
-              fromFile = toFile = file_from_char(c);
-              state = TO_RANK;
-          }
-          else if (state == TO_FILE)
-          {
-              toFile = file_from_char(c);
-              state = TO_RANK;
-          }
-          else if (state == TO_RANK && toFile != FILE_NONE)
-          {
-              // Previous file was for disambiguation
-              fromFile = toFile;
-              toFile = file_from_char(c);
-          }
-          else
-              return MOVE_NONE;
-          break;
-      case 'R':
-          if (state == TO_RANK)
-          {
-              toRank = rank_from_char(c);
-              state = (i < movestr.length() - 1) ? PROMOTION_OR_CHECK : END;
-          }
-          else if (state == TO_FILE && fromRank == RANK_NONE)
-          {
-              // It's a disambiguation rank instead of a file
-              fromRank = rank_from_char(c);
-          }
-          else
-              return MOVE_NONE;
-          break;
-      case 'x': case 'X':
-          if (state == TO_RANK)
-          {
-              // Previous file was for disambiguation, or it's a pawn capture
-              fromFile = toFile;
-              state = TO_FILE;
-          }
-          else if (state != TO_FILE)
-              return MOVE_NONE;
-          break;
-      case '=':
-          if (state == PROMOTION_OR_CHECK)
-              state = PROMOTION;
-          else
-              return MOVE_NONE;
-          break;
-      case '+': case '#':
-          if (state == PROMOTION_OR_CHECK || state == CHECK)
-              state = END;
-          else
-              return MOVE_NONE;
-          break;
-      default:
-          return MOVE_NONE;
-          break;
-      }
-  }
-
-  if (state != END)
-      return MOVE_NONE;
-
-  // Look for a matching move
-  Move m, move = MOVE_NONE;
-  to = make_square(toFile, toRank);
-  int matches = 0;
-
-  while ((m = mp.get_next_move()) != MOVE_NONE)
-      if (   pos.type_of_piece_on(move_from(m)) == pt
-          && move_to(m) == to
-          && move_promotion(m) == promotion
-          && (fromFile == FILE_NONE || fromFile == square_file(move_from(m)))
-          && (fromRank == RANK_NONE || fromRank == square_rank(move_from(m))))
-      {
-          move = m;
-          matches++;
-      }
-  return (matches == 1 ? move : MOVE_NONE);
-}
-
-
-/// line_to_san() takes a position and a line (an array of moves representing
-/// a sequence of legal moves from the position) as input, and returns a
-/// string containing the line in short algebraic notation.  If the boolean
-/// parameter 'breakLines' is true, line breaks are inserted, with a line
-/// length of 80 characters.  After a line break, 'startColumn' spaces are
-/// inserted at the beginning of the new line.
-
-const std::string line_to_san(const Position& pos, Move line[], int startColumn, bool breakLines) {
-
-  StateInfo st;
-  std::stringstream s;
-  std::string moveStr;
-  size_t length = 0;
-  size_t maxLength = 80 - startColumn;
-  Position p(pos);
-
-  for (int i = 0; line[i] != MOVE_NONE; i++)
-  {
-      moveStr = move_to_san(p, line[i]);
-      length += moveStr.length() + 1;
-      if (breakLines && length > maxLength)
-      {
-          s << '\n' << std::setw(startColumn) << ' ';
-          length = moveStr.length() + 1;
-      }
-      s << moveStr << ' ';
-
-      if (line[i] == MOVE_NULL)
-          p.do_null_move(st);
-      else
-          p.do_move(line[i], st);
-  }
-  return s.str();
-}
-
-
-/// pretty_pv() creates a human-readable string from a position and a PV.
-/// It is used to write search information to the log file (which is created
-/// when the UCI parameter "Use Search Log" is "true").
-
-const std::string pretty_pv(const Position& pos, int time, int depth,
-                            uint64_t nodes, Value score, Move pv[]) {
-  std::stringstream s;
-
-  // Depth
-  s << std::setw(2) << depth << "  ";
-
-  // Score
-  s << std::setw(8) << score_string(score);
-
-  // Time
-  s << std::setw(8) << time_string(time) << " ";
-
-  // Nodes
-  if (nodes < 1000000ULL)
-    s << std::setw(8) << nodes << " ";
-  else if (nodes < 1000000000ULL)
-    s << std::setw(7) << nodes/1000ULL << 'k' << " ";
-  else
-    s << std::setw(7) << nodes/1000000ULL << 'M' << " ";
-
-  // PV
-  s << line_to_san(pos, pv, 30, true);
-
-  return s.str();
-}
-
-
-namespace {
-
-  Ambiguity move_ambiguity(const Position& pos, Move m) {
-
-    Square from = move_from(m);
-    Square to = move_to(m);
-    Piece pc = pos.piece_on(from);
-
-    // King moves are never ambiguous, because there is never two kings of
-    // the same color.
-    if (type_of_piece(pc) == KING)
-        return AMBIGUITY_NONE;
-
-    MovePicker mp = MovePicker(pos, false, MOVE_NONE, EmptySearchStack, OnePly);
-    Move mv, moveList[8];
-
-    int n = 0;
-    while ((mv = mp.get_next_move()) != MOVE_NONE)
-        if (move_to(mv) == to && pos.piece_on(move_from(mv)) == pc && pos.pl_move_is_legal(mv))
-            moveList[n++] = mv;
-
-    if (n == 1)
-        return AMBIGUITY_NONE;
-
-    int f = 0, r = 0;
-    for (int i = 0; i < n; i++)
-    {
-        if (square_file(move_from(moveList[i])) == square_file(from))
-            f++;
-
-        if (square_rank(move_from(moveList[i])) == square_rank(from))
-            r++;
-    }
-    if (f == 1)
-        return AMBIGUITY_FILE;
-
-    if (r == 1)
-        return AMBIGUITY_RANK;
-
-    return AMBIGUITY_BOTH;
-  }
-
-
-  const std::string time_string(int milliseconds) {
-
-    std::stringstream s;
-    s << std::setfill('0');
-
-    int hours = milliseconds / (1000*60*60);
-    int minutes = (milliseconds - hours*1000*60*60) / (1000*60);
-    int seconds = (milliseconds - hours*1000*60*60 - minutes*1000*60) / 1000;
-
-    if (hours)
-        s << hours << ':';
-
-    s << std::setw(2) << minutes << ':' << std::setw(2) << seconds;
-    return s.str();
-  }
-
-
-  const std::string score_string(Value v) {
-
-    std::stringstream s;
-
-    if (v >= VALUE_MATE - 200)
-        s << "#" << (VALUE_MATE - v + 1) / 2;
-    else if(v <= -VALUE_MATE + 200)
-        s << "-#" << (VALUE_MATE + v) / 2;
-    else
-    {
-        float floatScore = float(v) / float(PawnValueMidgame);
-        if (v >= 0)
-            s << '+';
-
-        s << std::setprecision(2) << std::fixed << floatScore;
-    }
-    return s.str();
-  }
-}

src/san.h

@@ -1,44 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(SAN_H_INCLUDED)
-#define SAN_H_INCLUDED
-
-////
-//// Includes
-////
-
-#include <string>
-
-#include "move.h"
-#include "position.h"
-#include "value.h"
-
-
-////
-//// Prototypes
-////
-
-extern const std::string move_to_san(const Position& pos, Move m);
-extern Move move_from_san(const Position& pos, const std::string& str);
-extern const std::string line_to_san(const Position& pos, Move line[], int startColumn, bool breakLines);
-extern const std::string pretty_pv(const Position& pos, int time, int depth, uint64_t nodes, Value score, Move pv[]);
-
-#endif // !defined(SAN_H_INCLUDED)

src/search.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,77 +17,95 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(SEARCH_H_INCLUDED)
 #define SEARCH_H_INCLUDED
 
-////
+#include <cstring>
-//// Includes
+#include <memory>
-////
+#include <stack>
+#include <vector>
 
-#include "depth.h"
+#include "misc.h"
-#include "history.h"
-#include "lock.h"
-#include "movegen.h"
 #include "position.h"
-#include "tt.h"
+#include "types.h"
-#include "value.h"
 
+struct SplitPoint;
 
-////
+namespace Search {
-//// Constants
-////
 
-const int PLY_MAX = 100;
+/// The Stack struct keeps track of the information we need to remember from
-const int PLY_MAX_PLUS_2 = 102;
+/// nodes shallower and deeper in the tree during the search. Each search thread
-const int KILLER_MAX = 2;
+/// has its own array of Stack objects, indexed by the current ply.
 
-
+struct Stack {
-////
+  SplitPoint* sp;
-//// Types
+  int ply;
-////
-
-/// The SearchStack struct keeps track of the information we need to remember
-/// from nodes shallower and deeper in the tree during the search.  Each
-/// search thread has its own array of SearchStack objects, indexed by the
-/// current ply.
-
-struct SearchStack {
-  Move pv[PLY_MAX];
   Move currentMove;
-  Move mateKiller;
+  Move excludedMove;
-  Move threatMove;
+  Move killers[2];
-  Move killers[KILLER_MAX];
   Depth reduction;
-
+  Value eval;
-  void init(int ply);
+  Value evalMargin;
-  void initKillers();
+  int skipNullMove;
 };
 
 
-////
+/// RootMove struct is used for moves at the root of the tree. For each root
-//// Global variables
+/// move we store a score, a node count, and a PV (really a refutation in the
-////
+/// case of moves which fail low). Score is normally set at -VALUE_INFINITE for
+/// all non-pv moves.
+struct RootMove {
 
-extern SearchStack EmptySearchStack;
+  RootMove(){} // Needed by sort()
-extern TranspositionTable TT;
+  RootMove(Move m) : score(-VALUE_INFINITE), prevScore(-VALUE_INFINITE) {
-extern int ActiveThreads;
+    pv.push_back(m); pv.push_back(MOVE_NONE);
-extern Lock SMPLock;
+  }
 
-// Perhaps better to make H local, and pass as parameter to MovePicker?
+  bool operator<(const RootMove& m) const { return score < m.score; }
-extern History H;
+  bool operator==(const Move& m) const { return pv[0] == m; }
+
+  void extract_pv_from_tt(Position& pos);
+  void insert_pv_in_tt(Position& pos);
+
+  Value score;
+  Value prevScore;
+  std::vector<Move> pv;
+};
 
 
-////
+/// The LimitsType struct stores information sent by GUI about available time
-//// Prototypes
+/// to search the current move, maximum depth/time, if we are in analysis mode
-////
+/// or if we have to ponder while is our opponent's side to move.
 
-extern void init_threads();
+struct LimitsType {
-extern void stop_threads();
-extern void think(const Position &pos, bool infinite, bool ponder, int side_to_move,
-                  int time[], int increment[], int movesToGo, int maxDepth,
-                  int maxNodes, int maxTime, Move searchMoves[]);
-extern int64_t nodes_searched();
 
+  LimitsType() { memset(this, 0, sizeof(LimitsType)); }
+  bool use_time_management() const { return !(movetime | depth | nodes | infinite); }
+
+  int time[2], inc[2], movestogo, depth, nodes, movetime, infinite, ponder;
+};
+
+
+/// The SignalsType struct stores volatile flags updated during the search
+/// typically in an async fashion, for instance to stop the search by the GUI.
+
+struct SignalsType {
+  bool stopOnPonderhit, firstRootMove, stop, failedLowAtRoot;
+};
+
+typedef std::auto_ptr<std::stack<StateInfo> > StateStackPtr;
+
+extern volatile SignalsType Signals;
+extern LimitsType Limits;
+extern std::vector<RootMove> RootMoves;
+extern Position RootPosition;
+extern Time::point SearchTime;
+extern StateStackPtr SetupStates;
+
+extern void init();
+extern size_t perft(Position& pos, Depth depth);
+extern void think();
+
+} // namespace Search
 
 #endif // !defined(SEARCH_H_INCLUDED)

src/square.h

@@ -1,201 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(SQUARE_H_INCLUDED)
-#define SQUARE_H_INCLUDED
-
-////
-//// Includes
-////
-
-#include <cstdlib> // for abs()
-#include <string>
-
-#include "color.h"
-#include "misc.h"
-
-
-////
-//// Types
-////
-
-enum Square {
-  SQ_A1, SQ_B1, SQ_C1, SQ_D1, SQ_E1, SQ_F1, SQ_G1, SQ_H1,
-  SQ_A2, SQ_B2, SQ_C2, SQ_D2, SQ_E2, SQ_F2, SQ_G2, SQ_H2,
-  SQ_A3, SQ_B3, SQ_C3, SQ_D3, SQ_E3, SQ_F3, SQ_G3, SQ_H3,
-  SQ_A4, SQ_B4, SQ_C4, SQ_D4, SQ_E4, SQ_F4, SQ_G4, SQ_H4,
-  SQ_A5, SQ_B5, SQ_C5, SQ_D5, SQ_E5, SQ_F5, SQ_G5, SQ_H5,
-  SQ_A6, SQ_B6, SQ_C6, SQ_D6, SQ_E6, SQ_F6, SQ_G6, SQ_H6,
-  SQ_A7, SQ_B7, SQ_C7, SQ_D7, SQ_E7, SQ_F7, SQ_G7, SQ_H7,
-  SQ_A8, SQ_B8, SQ_C8, SQ_D8, SQ_E8, SQ_F8, SQ_G8, SQ_H8,
-  SQ_NONE
-};
-
-enum File {
-  FILE_A, FILE_B, FILE_C, FILE_D, FILE_E, FILE_F, FILE_G, FILE_H, FILE_NONE
-};
-
-enum Rank {
-  RANK_1, RANK_2, RANK_3, RANK_4, RANK_5, RANK_6, RANK_7, RANK_8, RANK_NONE
-};
-
-enum SquareDelta {
-  DELTA_SSW = -021, DELTA_SS = -020, DELTA_SSE = -017, DELTA_SWW = -012,
-  DELTA_SW = -011, DELTA_S = -010, DELTA_SE = -07, DELTA_SEE = -06,
-  DELTA_W = -01, DELTA_ZERO = 0, DELTA_E = 01, DELTA_NWW = 06, DELTA_NW = 07,
-  DELTA_N = 010, DELTA_NE = 011, DELTA_NEE = 012, DELTA_NNW = 017,
-  DELTA_NN = 020, DELTA_NNE = 021
-};
-
-
-////
-//// Constants
-////
-
-const int FlipMask = 070;
-const int FlopMask = 07;
-
-
-////
-//// Inline functions
-////
-
-inline File operator+ (File x, int i) { return File(int(x) + i); }
-inline File operator+ (File x, File y) { return x + int(y); }
-inline void operator++ (File &x, int) { x = File(int(x) + 1); }
-inline void operator+= (File &x, int i) { x = File(int(x) + i); }
-inline File operator- (File x, int i) { return File(int(x) - i); }
-inline void operator-- (File &x, int) { x = File(int(x) - 1); }
-inline void operator-= (File &x, int i) { x = File(int(x) - i); }
-
-inline Rank operator+ (Rank x, int i) { return Rank(int(x) + i); }
-inline Rank operator+ (Rank x, Rank y) { return x + int(y); }
-inline void operator++ (Rank &x, int) { x = Rank(int(x) + 1); }
-inline void operator+= (Rank &x, int i) { x = Rank(int(x) + i); }
-inline Rank operator- (Rank x, int i) { return Rank(int(x) - i); }
-inline void operator-- (Rank &x, int) { x = Rank(int(x) - 1); }
-inline void operator-= (Rank &x, int i) { x = Rank(int(x) - i); }
-
-inline Square operator+ (Square x, int i) { return Square(int(x) + i); }
-inline void operator++ (Square &x, int) { x = Square(int(x) + 1); }
-inline void operator+= (Square &x, int i) { x = Square(int(x) + i); }
-inline Square operator- (Square x, int i) { return Square(int(x) - i); }
-inline void operator-- (Square &x, int) { x = Square(int(x) - 1); }
-inline void operator-= (Square &x, int i) { x = Square(int(x) - i); }
-inline Square operator+ (Square x, SquareDelta i) { return Square(int(x) + i); }
-inline void operator+= (Square &x, SquareDelta i) { x = Square(int(x) + i); }
-inline Square operator- (Square x, SquareDelta i) { return Square(int(x) - i); }
-inline void operator-= (Square &x, SquareDelta i) { x = Square(int(x) - i); }
-inline SquareDelta operator- (Square x, Square y) {
-  return SquareDelta(int(x) - int(y));
-}
-
-inline Square make_square(File f, Rank r) {
-  return Square(int(f) | (int(r) << 3));
-}
-
-inline File square_file(Square s) {
-  return File(int(s) & 7);
-}
-
-inline Rank square_rank(Square s) {
-  return Rank(int(s) >> 3);
-}
-
-inline Square flip_square(Square s) {
-  return Square(int(s) ^ FlipMask);
-}
-
-inline Square flop_square(Square s) {
-  return Square(int(s) ^ FlopMask);
-}
-
-inline Square relative_square(Color c, Square s) {
-  return Square(int(s) ^ (int(c) * FlipMask));
-}
-
-inline Rank relative_rank(Color c, Square s) {
-  return square_rank(relative_square(c, s));
-}
-
-inline Color square_color(Square s) {
-  return Color((int(square_file(s)) + int(square_rank(s))) & 1);
-}
-
-inline int file_distance(File f1, File f2) {
-  return abs(int(f1) - int(f2));
-}
-
-inline int file_distance(Square s1, Square s2) {
-  return file_distance(square_file(s1), square_file(s2));
-}
-
-inline int rank_distance(Rank r1, Rank r2) {
-  return abs(int(r1) - int(r2));
-}
-
-inline int rank_distance(Square s1, Square s2) {
-  return rank_distance(square_rank(s1), square_rank(s2));
-}
-
-inline int square_distance(Square s1, Square s2) {
-  return Max(file_distance(s1, s2), rank_distance(s1, s2));
-}
-
-inline File file_from_char(char c) {
-  return File(c - 'a') + FILE_A;
-}
-
-inline char file_to_char(File f) {
-  return char(f - FILE_A + int('a'));
-}
-
-inline Rank rank_from_char(char c) {
-  return Rank(c - '1') + RANK_1;
-}
-
-inline char rank_to_char(Rank r) {
-  return char(r - RANK_1 + int('1'));
-}
-
-inline Square square_from_string(const std::string& str) {
-  return make_square(file_from_char(str[0]), rank_from_char(str[1]));
-}
-
-inline const std::string square_to_string(Square s) {
-  std::string str;
-  str += file_to_char(square_file(s));
-  str += rank_to_char(square_rank(s));
-  return str;
-}
-
-inline bool file_is_ok(File f) {
-  return f >= FILE_A && f <= FILE_H;
-}
-
-inline bool rank_is_ok(Rank r) {
-  return r >= RANK_1 && r <= RANK_8;
-}
-
-inline bool square_is_ok(Square s) {
-  return file_is_ok(square_file(s)) && rank_is_ok(square_rank(s));
-}
-
-#endif // !defined(SQUARE_H_INCLUDED)

src/thread.cpp

@@ -0,0 +1,436 @@
+/*
+  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
+  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
+
+  Stockfish is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  Stockfish is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <cassert>
+#include <iostream>
+
+#include "movegen.h"
+#include "search.h"
+#include "thread.h"
+#include "ucioption.h"
+
+using namespace Search;
+
+ThreadPool Threads; // Global object
+
+namespace { extern "C" {
+
+ // start_routine() is the C function which is called when a new thread
+ // is launched. It is a wrapper to member function pointed by start_fn.
+
+ long start_routine(Thread* th) { (th->*(th->start_fn))(); return 0; }
+
+} }
+
+
+// Thread c'tor starts a newly-created thread of execution that will call
+// the idle loop function pointed by start_fn going immediately to sleep.
+
+Thread::Thread(Fn fn) {
+
+  is_searching = do_exit = false;
+  maxPly = splitPointsCnt = 0;
+  curSplitPoint = NULL;
+  start_fn = fn;
+  idx = Threads.size();
+
+  do_sleep = (fn != &Thread::main_loop); // Avoid a race with start_searching()
+
+  if (!thread_create(handle, start_routine, this))
+  {
+      std::cerr << "Failed to create thread number " << idx << std::endl;
+      ::exit(EXIT_FAILURE);
+  }
+}
+
+
+// Thread d'tor waits for thread termination before to return.
+
+Thread::~Thread() {
+
+  assert(do_sleep);
+
+  do_exit = true; // Search must be already finished
+  wake_up();
+  thread_join(handle); // Wait for thread termination
+}
+
+
+// Thread::timer_loop() is where the timer thread waits maxPly milliseconds and
+// then calls check_time(). If maxPly is 0 thread sleeps until is woken up.
+extern void check_time();
+
+void Thread::timer_loop() {
+
+  while (!do_exit)
+  {
+      mutex.lock();
+      sleepCondition.wait_for(mutex, maxPly ? maxPly : INT_MAX);
+      mutex.unlock();
+      check_time();
+  }
+}
+
+
+// Thread::main_loop() is where the main thread is parked waiting to be started
+// when there is a new search. Main thread will launch all the slave threads.
+
+void Thread::main_loop() {
+
+  while (true)
+  {
+      mutex.lock();
+
+      do_sleep = true; // Always return to sleep after a search
+      is_searching = false;
+
+      while (do_sleep && !do_exit)
+      {
+          Threads.sleepCondition.notify_one(); // Wake up UI thread if needed
+          sleepCondition.wait(mutex);
+      }
+
+      mutex.unlock();
+
+      if (do_exit)
+          return;
+
+      is_searching = true;
+
+      Search::think();
+
+      assert(is_searching);
+  }
+}
+
+
+// Thread::wake_up() wakes up the thread, normally at the beginning of the search
+// or, if "sleeping threads" is used at split time.
+
+void Thread::wake_up() {
+
+  mutex.lock();
+  sleepCondition.notify_one();
+  mutex.unlock();
+}
+
+
+// Thread::wait_for_stop_or_ponderhit() is called when the maximum depth is
+// reached while the program is pondering. The point is to work around a wrinkle
+// in the UCI protocol: When pondering, the engine is not allowed to give a
+// "bestmove" before the GUI sends it a "stop" or "ponderhit" command. We simply
+// wait here until one of these commands (that raise StopRequest) is sent and
+// then return, after which the bestmove and pondermove will be printed.
+
+void Thread::wait_for_stop_or_ponderhit() {
+
+  Signals.stopOnPonderhit = true;
+
+  mutex.lock();
+  while (!Signals.stop) sleepCondition.wait(mutex);;
+  mutex.unlock();
+}
+
+
+// Thread::cutoff_occurred() checks whether a beta cutoff has occurred in the
+// current active split point, or in some ancestor of the split point.
+
+bool Thread::cutoff_occurred() const {
+
+  for (SplitPoint* sp = curSplitPoint; sp; sp = sp->parent)
+      if (sp->cutoff)
+          return true;
+
+  return false;
+}
+
+
+// Thread::is_available_to() checks whether the thread is available to help the
+// thread 'master' at a split point. An obvious requirement is that thread must
+// be idle. With more than two threads, this is not sufficient: If the thread is
+// the master of some active split point, it is only available as a slave to the
+// slaves which are busy searching the split point at the top of slaves split
+// point stack (the "helpful master concept" in YBWC terminology).
+
+bool Thread::is_available_to(Thread* master) const {
+
+  if (is_searching)
+      return false;
+
+  // Make a local copy to be sure doesn't become zero under our feet while
+  // testing next condition and so leading to an out of bound access.
+  int spCnt = splitPointsCnt;
+
+  // No active split points means that the thread is available as a slave for any
+  // other thread otherwise apply the "helpful master" concept if possible.
+  return !spCnt || (splitPoints[spCnt - 1].slavesMask & (1ULL << master->idx));
+}
+
+
+// init() is called at startup. Initializes lock and condition variable and
+// launches requested threads sending them immediately to sleep. We cannot use
+// a c'tor becuase Threads is a static object and we need a fully initialized
+// engine at this point due to allocation of endgames in Thread c'tor.
+
+void ThreadPool::init() {
+
+  timer = new Thread(&Thread::timer_loop);
+  threads.push_back(new Thread(&Thread::main_loop));
+  read_uci_options();
+}
+
+
+// exit() cleanly terminates the threads before the program exits.
+
+void ThreadPool::exit() {
+
+  for (size_t i = 0; i < threads.size(); i++)
+      delete threads[i];
+
+  delete timer;
+}
+
+
+// read_uci_options() updates internal threads parameters from the corresponding
+// UCI options and creates/destroys threads to match the requested number. Thread
+// objects are dynamically allocated to avoid creating in advance all possible
+// threads, with included pawns and material tables, if only few are used.
+
+void ThreadPool::read_uci_options() {
+
+  maxThreadsPerSplitPoint = Options["Max Threads per Split Point"];
+  minimumSplitDepth       = Options["Min Split Depth"] * ONE_PLY;
+  useSleepingThreads      = Options["Use Sleeping Threads"];
+  size_t requested        = Options["Threads"];
+
+  assert(requested > 0);
+
+  while (threads.size() < requested)
+      threads.push_back(new Thread(&Thread::idle_loop));
+
+  while (threads.size() > requested)
+  {
+      delete threads.back();
+      threads.pop_back();
+  }
+}
+
+
+// wake_up() is called before a new search to start the threads that are waiting
+// on the sleep condition and to reset maxPly. When useSleepingThreads is set
+// threads will be woken up at split time.
+
+void ThreadPool::wake_up() const {
+
+  for (size_t i = 0; i < threads.size(); i++)
+  {
+      threads[i]->maxPly = 0;
+      threads[i]->do_sleep = false;
+
+      if (!useSleepingThreads)
+          threads[i]->wake_up();
+  }
+}
+
+
+// sleep() is called after the search finishes to ask all the threads but the
+// main one to go waiting on a sleep condition.
+
+void ThreadPool::sleep() const {
+
+  // Main thread will go to sleep by itself to avoid a race with start_searching()
+  for (size_t i = 1; i < threads.size(); i++)
+      threads[i]->do_sleep = true;
+}
+
+
+// available_slave_exists() tries to find an idle thread which is available as
+// a slave for the thread 'master'.
+
+bool ThreadPool::available_slave_exists(Thread* master) const {
+
+  for (size_t i = 0; i < threads.size(); i++)
+      if (threads[i]->is_available_to(master))
+          return true;
+
+  return false;
+}
+
+
+// split() does the actual work of distributing the work at a node between
+// several available threads. If it does not succeed in splitting the node
+// (because no idle threads are available, or because we have no unused split
+// point objects), the function immediately returns. If splitting is possible, a
+// SplitPoint object is initialized with all the data that must be copied to the
+// helper threads and then helper threads are told that they have been assigned
+// work. This will cause them to instantly leave their idle loops and call
+// search(). When all threads have returned from search() then split() returns.
+
+template <bool Fake>
+Value ThreadPool::split(Position& pos, Stack* ss, Value alpha, Value beta,
+                        Value bestValue, Move* bestMove, Depth depth,
+                        Move threatMove, int moveCount, MovePicker* mp, int nodeType) {
+
+  assert(pos.pos_is_ok());
+  assert(bestValue > -VALUE_INFINITE);
+  assert(bestValue <= alpha);
+  assert(alpha < beta);
+  assert(beta <= VALUE_INFINITE);
+  assert(depth > DEPTH_ZERO);
+
+  Thread* master = pos.this_thread();
+
+  if (master->splitPointsCnt >= MAX_SPLITPOINTS_PER_THREAD)
+      return bestValue;
+
+  // Pick the next available split point from the split point stack
+  SplitPoint& sp = master->splitPoints[master->splitPointsCnt];
+
+  sp.parent = master->curSplitPoint;
+  sp.master = master;
+  sp.cutoff = false;
+  sp.slavesMask = 1ULL << master->idx;
+  sp.depth = depth;
+  sp.bestMove = *bestMove;
+  sp.threatMove = threatMove;
+  sp.alpha = alpha;
+  sp.beta = beta;
+  sp.nodeType = nodeType;
+  sp.bestValue = bestValue;
+  sp.mp = mp;
+  sp.moveCount = moveCount;
+  sp.pos = &pos;
+  sp.nodes = 0;
+  sp.ss = ss;
+
+  assert(master->is_searching);
+
+  master->curSplitPoint = &sp;
+  int slavesCnt = 0;
+
+  // Try to allocate available threads and ask them to start searching setting
+  // is_searching flag. This must be done under lock protection to avoid concurrent
+  // allocation of the same slave by another master.
+  sp.mutex.lock();
+  mutex.lock();
+
+  for (size_t i = 0; i < threads.size() && !Fake; ++i)
+      if (threads[i]->is_available_to(master))
+      {
+          sp.slavesMask |= 1ULL << i;
+          threads[i]->curSplitPoint = &sp;
+          threads[i]->is_searching = true; // Slave leaves idle_loop()
+
+          if (useSleepingThreads)
+              threads[i]->wake_up();
+
+          if (++slavesCnt + 1 >= maxThreadsPerSplitPoint) // Master is always included
+              break;
+      }
+
+  master->splitPointsCnt++;
+
+  mutex.unlock();
+  sp.mutex.unlock();
+
+  // Everything is set up. The master thread enters the idle loop, from which
+  // it will instantly launch a search, because its is_searching flag is set.
+  // The thread will return from the idle loop when all slaves have finished
+  // their work at this split point.
+  if (slavesCnt || Fake)
+  {
+      master->idle_loop();
+
+      // In helpful master concept a master can help only a sub-tree of its split
+      // point, and because here is all finished is not possible master is booked.
+      assert(!master->is_searching);
+  }
+
+  // We have returned from the idle loop, which means that all threads are
+  // finished. Note that setting is_searching and decreasing splitPointsCnt is
+  // done under lock protection to avoid a race with Thread::is_available_to().
+  sp.mutex.lock(); // To protect sp.nodes
+  mutex.lock();
+
+  master->is_searching = true;
+  master->splitPointsCnt--;
+  master->curSplitPoint = sp.parent;
+  pos.set_nodes_searched(pos.nodes_searched() + sp.nodes);
+  *bestMove = sp.bestMove;
+
+  mutex.unlock();
+  sp.mutex.unlock();
+
+  return sp.bestValue;
+}
+
+// Explicit template instantiations
+template Value ThreadPool::split<false>(Position&, Stack*, Value, Value, Value, Move*, Depth, Move, int, MovePicker*, int);
+template Value ThreadPool::split<true>(Position&, Stack*, Value, Value, Value, Move*, Depth, Move, int, MovePicker*, int);
+
+
+// set_timer() is used to set the timer to trigger after msec milliseconds.
+// If msec is 0 then timer is stopped.
+
+void ThreadPool::set_timer(int msec) {
+
+  timer->mutex.lock();
+  timer->maxPly = msec;
+  timer->sleepCondition.notify_one(); // Wake up and restart the timer
+  timer->mutex.unlock();
+}
+
+
+// wait_for_search_finished() waits for main thread to go to sleep, this means
+// search is finished. Then returns.
+
+void ThreadPool::wait_for_search_finished() {
+
+  Thread* t = main_thread();
+  t->mutex.lock();
+  t->sleepCondition.notify_one(); // In case is waiting for stop or ponderhit
+  while (!t->do_sleep) sleepCondition.wait(t->mutex);
+  t->mutex.unlock();
+}
+
+
+// start_searching() wakes up the main thread sleeping in  main_loop() so to start
+// a new search, then returns immediately.
+
+void ThreadPool::start_searching(const Position& pos, const LimitsType& limits,
+                                 const std::vector<Move>& searchMoves, StateStackPtr& states) {
+  wait_for_search_finished();
+
+  SearchTime = Time::now(); // As early as possible
+
+  Signals.stopOnPonderhit = Signals.firstRootMove = false;
+  Signals.stop = Signals.failedLowAtRoot = false;
+
+  RootPosition = pos;
+  Limits = limits;
+  SetupStates = states; // Ownership transfer here
+  RootMoves.clear();
+
+  for (MoveList<LEGAL> ml(pos); !ml.end(); ++ml)
+      if (searchMoves.empty() || count(searchMoves.begin(), searchMoves.end(), ml.move()))
+          RootMoves.push_back(RootMove(ml.move()));
+
+  main_thread()->do_sleep = false;
+  main_thread()->wake_up();
+}

src/thread.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,63 +17,152 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(THREAD_H_INCLUDED)
 #define THREAD_H_INCLUDED
 
+#include <vector>
 
-////
+#include "material.h"
-//// Includes
-////
-
-#include "lock.h"
 #include "movepick.h"
+#include "pawns.h"
 #include "position.h"
 #include "search.h"
 
+const int MAX_THREADS = 32;
+const int MAX_SPLITPOINTS_PER_THREAD = 8;
 
-////
+struct Mutex {
-//// Constants and variables
+  Mutex() { lock_init(l); }
-////
+ ~Mutex() { lock_destroy(l); }
 
-const int THREAD_MAX = 8;
+  void lock() { lock_grab(l); }
+  void unlock() { lock_release(l); }
 
+private:
+  friend struct ConditionVariable;
 
-////
+  Lock l;
-//// Types
+};
-////
+
+struct ConditionVariable {
+  ConditionVariable() { cond_init(c); }
+ ~ConditionVariable() { cond_destroy(c); }
+
+  void wait(Mutex& m) { cond_wait(c, m.l); }
+  void wait_for(Mutex& m, int ms) { timed_wait(c, m.l, ms); }
+  void notify_one() { cond_signal(c); }
+
+private:
+  WaitCondition c;
+};
+
+class Thread;
 
 struct SplitPoint {
-  SplitPoint *parent;
+
-  Position pos;
+  // Const data after split point has been setup
-  SearchStack sstack[THREAD_MAX][PLY_MAX];
+  const Position* pos;
-  SearchStack *parentSstack;
+  const Search::Stack* ss;
-  int ply;
   Depth depth;
-  volatile Value alpha, beta, bestValue;
+  Value beta;
-  bool pvNode;
+  int nodeType;
-  Bitboard dcCandidates;
+  Thread* master;
-  int master, slaves[THREAD_MAX];
+  Move threatMove;
-  Lock lock;
+
+  // Const pointers to shared data
   MovePicker* mp;
-  volatile int moves;
+  SplitPoint* parent;
-  volatile int cpus;
+
-  bool finished;
+  // Shared data
+  Mutex mutex;
+  volatile uint64_t slavesMask;
+  volatile int64_t nodes;
+  volatile Value alpha;
+  volatile Value bestValue;
+  volatile Move bestMove;
+  volatile int moveCount;
+  volatile bool cutoff;
 };
 
 
-struct Thread {
+/// Thread struct keeps together all the thread related stuff like locks, state
-  SplitPoint *splitPoint;
+/// and especially split points. We also use per-thread pawn and material hash
-  int activeSplitPoints;
+/// tables so that once we get a pointer to an entry its life time is unlimited
-  uint64_t nodes;
+/// and we don't have to care about someone changing the entry under our feet.
-  bool failHighPly1;
+
-  volatile bool stop;
+class Thread {
-  volatile bool running;
+
-  volatile bool idle;
+  typedef void (Thread::* Fn) (); // Pointer to member function
-  volatile bool workIsWaiting;
+
-  volatile bool printCurrentLine;
+public:
-  unsigned char pad[64];
+  Thread(Fn fn);
+ ~Thread();
+
+  void wake_up();
+  bool cutoff_occurred() const;
+  bool is_available_to(Thread* master) const;
+  void idle_loop();
+  void main_loop();
+  void timer_loop();
+  void wait_for_stop_or_ponderhit();
+
+  SplitPoint splitPoints[MAX_SPLITPOINTS_PER_THREAD];
+  MaterialTable materialTable;
+  PawnTable pawnTable;
+  size_t idx;
+  int maxPly;
+  Mutex mutex;
+  ConditionVariable sleepCondition;
+  NativeHandle handle;
+  Fn start_fn;
+  SplitPoint* volatile curSplitPoint;
+  volatile int splitPointsCnt;
+  volatile bool is_searching;
+  volatile bool do_sleep;
+  volatile bool do_exit;
 };
 
 
+/// ThreadPool class handles all the threads related stuff like init, starting,
+/// parking and, the most important, launching a slave thread at a split point.
+/// All the access to shared thread data is done through this class.
+
+class ThreadPool {
+
+public:
+  void init(); // No c'tor and d'tor, threads rely on globals that should
+  void exit(); // be initialized and valid during the whole thread lifetime.
+
+  Thread& operator[](size_t id) { return *threads[id]; }
+  bool use_sleeping_threads() const { return useSleepingThreads; }
+  int min_split_depth() const { return minimumSplitDepth; }
+  size_t size() const { return threads.size(); }
+  Thread* main_thread() { return threads[0]; }
+
+  void wake_up() const;
+  void sleep() const;
+  void read_uci_options();
+  bool available_slave_exists(Thread* master) const;
+  void set_timer(int msec);
+  void wait_for_search_finished();
+  void start_searching(const Position&, const Search::LimitsType&,
+                       const std::vector<Move>&, Search::StateStackPtr&);
+
+  template <bool Fake>
+  Value split(Position& pos, Search::Stack* ss, Value alpha, Value beta, Value bestValue, Move* bestMove,
+              Depth depth, Move threatMove, int moveCount, MovePicker* mp, int nodeType);
+private:
+  friend class Thread;
+
+  std::vector<Thread*> threads;
+  Thread* timer;
+  Mutex mutex;
+  ConditionVariable sleepCondition;
+  Depth minimumSplitDepth;
+  int maxThreadsPerSplitPoint;
+  bool useSleepingThreads;
+};
+
+extern ThreadPool Threads;
+
 #endif // !defined(THREAD_H_INCLUDED)

src/timeman.cpp

@@ -0,0 +1,162 @@
+/*
+  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
+  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
+
+  Stockfish is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  Stockfish is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <cmath>
+#include <algorithm>
+
+#include "search.h"
+#include "timeman.h"
+#include "ucioption.h"
+
+namespace {
+
+  /// Constants
+
+  const int MoveHorizon  = 50;    // Plan time management at most this many moves ahead
+  const float MaxRatio   = 3.0f;  // When in trouble, we can step over reserved time with this ratio
+  const float StealRatio = 0.33f; // However we must not steal time from remaining moves over this ratio
+
+
+  // MoveImportance[] is based on naive statistical analysis of "how many games are still undecided
+  // after n half-moves". Game is considered "undecided" as long as neither side has >275cp advantage.
+  // Data was extracted from CCRL game database with some simple filtering criteria.
+  const int MoveImportance[512] = {
+    7780, 7780, 7780, 7780, 7780, 7780, 7780, 7780, 7780, 7780, 7780, 7780, 7780, 7780, 7780, 7780,
+    7780, 7780, 7780, 7780, 7778, 7778, 7776, 7776, 7776, 7773, 7770, 7768, 7766, 7763, 7757, 7751,
+    7743, 7735, 7724, 7713, 7696, 7689, 7670, 7656, 7627, 7605, 7571, 7549, 7522, 7493, 7462, 7425,
+    7385, 7350, 7308, 7272, 7230, 7180, 7139, 7094, 7055, 7010, 6959, 6902, 6841, 6778, 6705, 6651,
+    6569, 6508, 6435, 6378, 6323, 6253, 6152, 6085, 5995, 5931, 5859, 5794, 5717, 5646, 5544, 5462,
+    5364, 5282, 5172, 5078, 4988, 4901, 4831, 4764, 4688, 4609, 4536, 4443, 4365, 4293, 4225, 4155,
+    4085, 4005, 3927, 3844, 3765, 3693, 3634, 3560, 3479, 3404, 3331, 3268, 3207, 3146, 3077, 3011,
+    2947, 2894, 2828, 2776, 2727, 2676, 2626, 2589, 2538, 2490, 2442, 2394, 2345, 2302, 2243, 2192,
+    2156, 2115, 2078, 2043, 2004, 1967, 1922, 1893, 1845, 1809, 1772, 1736, 1702, 1674, 1640, 1605,
+    1566, 1536, 1509, 1479, 1452, 1423, 1388, 1362, 1332, 1304, 1289, 1266, 1250, 1228, 1206, 1180,
+    1160, 1134, 1118, 1100, 1080, 1068, 1051, 1034, 1012, 1001, 980, 960, 945, 934, 916, 900, 888,
+    878, 865, 852, 828, 807, 787, 770, 753, 744, 731, 722, 706, 700, 683, 676, 671, 664, 652, 641,
+    634, 627, 613, 604, 591, 582, 568, 560, 552, 540, 534, 529, 519, 509, 495, 484, 474, 467, 460,
+    450, 438, 427, 419, 410, 406, 399, 394, 387, 382, 377, 372, 366, 359, 353, 348, 343, 337, 333,
+    328, 321, 315, 309, 303, 298, 293, 287, 284, 281, 277, 273, 265, 261, 255, 251, 247, 241, 240,
+    235, 229, 218, 217, 213, 212, 208, 206, 197, 193, 191, 189, 185, 184, 180, 177, 172, 170, 170,
+    170, 166, 163, 159, 158, 156, 155, 151, 146, 141, 138, 136, 132, 130, 128, 125, 123, 122, 118,
+    118, 118, 117, 115, 114, 108, 107, 105, 105, 105, 102, 97, 97, 95, 94, 93, 91, 88, 86, 83, 80,
+    80, 79, 79, 79, 78, 76, 75, 72, 72, 71, 70, 68, 65, 63, 61, 61, 59, 59, 59, 58, 56, 55, 54, 54,
+    52, 49, 48, 48, 48, 48, 45, 45, 45, 44, 43, 41, 41, 41, 41, 40, 40, 38, 37, 36, 34, 34, 34, 33,
+    31, 29, 29, 29, 28, 28, 28, 28, 28, 28, 28, 27, 27, 27, 27, 27, 24, 24, 23, 23, 22, 21, 20, 20,
+    19, 19, 19, 19, 19, 18, 18, 18, 18, 17, 17, 17, 17, 17, 16, 16, 15, 15, 14, 14, 14, 12, 12, 11,
+    9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+    8, 8, 8, 8, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+    4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2,
+    2, 1, 1, 1, 1, 1, 1, 1 };
+
+  int move_importance(int ply) { return MoveImportance[std::min(ply, 511)]; }
+
+
+  /// Function Prototypes
+
+  enum TimeType { OptimumTime, MaxTime };
+
+  template<TimeType>
+  int remaining(int myTime, int movesToGo, int fullMoveNumber, int slowMover);
+}
+
+
+void TimeManager::pv_instability(int curChanges, int prevChanges) {
+
+  unstablePVExtraTime =  curChanges  * (optimumSearchTime / 2)
+                       + prevChanges * (optimumSearchTime / 3);
+}
+
+
+void TimeManager::init(const Search::LimitsType& limits, int currentPly, Color us)
+{
+  /* We support four different kind of time controls:
+
+      increment == 0 && movesToGo == 0 means: x basetime  [sudden death!]
+      increment == 0 && movesToGo != 0 means: x moves in y minutes
+      increment >  0 && movesToGo == 0 means: x basetime + z increment
+      increment >  0 && movesToGo != 0 means: x moves in y minutes + z increment
+
+    Time management is adjusted by following UCI parameters:
+
+      emergencyMoveHorizon: Be prepared to always play at least this many moves
+      emergencyBaseTime   : Always attempt to keep at least this much time (in ms) at clock
+      emergencyMoveTime   : Plus attempt to keep at least this much time for each remaining emergency move
+      minThinkingTime     : No matter what, use at least this much thinking before doing the move
+  */
+
+  int hypMTG, hypMyTime, t1, t2;
+
+  // Read uci parameters
+  int emergencyMoveHorizon = Options["Emergency Move Horizon"];
+  int emergencyBaseTime    = Options["Emergency Base Time"];
+  int emergencyMoveTime    = Options["Emergency Move Time"];
+  int minThinkingTime      = Options["Minimum Thinking Time"];
+  int slowMover            = Options["Slow Mover"];
+
+  // Initialize to maximum values but unstablePVExtraTime that is reset
+  unstablePVExtraTime = 0;
+  optimumSearchTime = maximumSearchTime = limits.time[us];
+
+  // We calculate optimum time usage for different hypothetic "moves to go"-values and choose the
+  // minimum of calculated search time values. Usually the greatest hypMTG gives the minimum values.
+  for (hypMTG = 1; hypMTG <= (limits.movestogo ? std::min(limits.movestogo, MoveHorizon) : MoveHorizon); hypMTG++)
+  {
+      // Calculate thinking time for hypothetic "moves to go"-value
+      hypMyTime =  limits.time[us]
+                 + limits.inc[us] * (hypMTG - 1)
+                 - emergencyBaseTime
+                 - emergencyMoveTime * std::min(hypMTG, emergencyMoveHorizon);
+
+      hypMyTime = std::max(hypMyTime, 0);
+
+      t1 = minThinkingTime + remaining<OptimumTime>(hypMyTime, hypMTG, currentPly, slowMover);
+      t2 = minThinkingTime + remaining<MaxTime>(hypMyTime, hypMTG, currentPly, slowMover);
+
+      optimumSearchTime = std::min(optimumSearchTime, t1);
+      maximumSearchTime = std::min(maximumSearchTime, t2);
+  }
+
+  if (Options["Ponder"])
+      optimumSearchTime += optimumSearchTime / 4;
+
+  // Make sure that maxSearchTime is not over absoluteMaxSearchTime
+  optimumSearchTime = std::min(optimumSearchTime, maximumSearchTime);
+}
+
+
+namespace {
+
+  template<TimeType T>
+  int remaining(int myTime, int movesToGo, int currentPly, int slowMover)
+  {
+    const float TMaxRatio   = (T == OptimumTime ? 1 : MaxRatio);
+    const float TStealRatio = (T == OptimumTime ? 0 : StealRatio);
+
+    int thisMoveImportance = move_importance(currentPly) * slowMover / 100;
+    int otherMovesImportance = 0;
+
+    for (int i = 1; i < movesToGo; i++)
+        otherMovesImportance += move_importance(currentPly + 2 * i);
+
+    float ratio1 = (TMaxRatio * thisMoveImportance) / float(TMaxRatio * thisMoveImportance + otherMovesImportance);
+    float ratio2 = (thisMoveImportance + TStealRatio * otherMovesImportance) / float(thisMoveImportance + otherMovesImportance);
+
+    return int(floor(myTime * std::min(ratio1, ratio2)));
+  }
+}

src/timeman.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,36 +17,23 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#if !defined(TIMEMAN_H_INCLUDED)
+#define TIMEMAN_H_INCLUDED
 
-#if !defined(SCALE_H_INCLUDED)
+/// The TimeManager class computes the optimal time to think depending on the
-#define SCALE_H_INCLUDED
+/// maximum available time, the move game number and other parameters.
 
-////
+class TimeManager {
-//// Includes
+public:
-////
+  void init(const Search::LimitsType& limits, int currentPly, Color us);
+  void pv_instability(int curChanges, int prevChanges);
+  int available_time() const { return optimumSearchTime + unstablePVExtraTime; }
+  int maximum_time() const { return maximumSearchTime; }
 
-#include "value.h"
+private:
-
+  int optimumSearchTime;
-
+  int maximumSearchTime;
-////
+  int unstablePVExtraTime;
-//// Types
-////
-
-enum ScaleFactor {
-  SCALE_FACTOR_ZERO = 0,
-  SCALE_FACTOR_NORMAL = 64,
-  SCALE_FACTOR_MAX = 128,
-  SCALE_FACTOR_NONE = 255
 };
 
-
+#endif // !defined(TIMEMAN_H_INCLUDED)
-////
-//// Inline functions
-////
-
-inline Value apply_scale_factor(Value v, ScaleFactor f) {
-  return Value((v * f) / int(SCALE_FACTOR_NORMAL));
-}
-
-
-#endif // !defined(SCALE_H_INCLUDED)

src/tt.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,27 +17,18 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-////
-//// Includes
-////
-
-#include <cassert>
-#include <cmath>
 #include <cstring>
+#include <iostream>
 
+#include "bitboard.h"
 #include "tt.h"
 
-
+TranspositionTable TT; // Our global transposition table
-////
-//// Functions
-////
 
 TranspositionTable::TranspositionTable() {
 
-  size = writes = 0;
+  size = generation = 0;
-  entries = 0;
+  entries = NULL;
-  generation = 0;
 }
 
 TranspositionTable::~TranspositionTable() {
@@ -46,151 +37,105 @@ TranspositionTable::~TranspositionTable() {
 }
 
 
-/// TranspositionTable::set_size sets the size of the transposition table,
+/// TranspositionTable::set_size() sets the size of the transposition table,
-/// measured in megabytes.
+/// measured in megabytes. Transposition table consists of a power of 2 number of
+/// TTCluster and each cluster consists of ClusterSize number of TTEntries. Each
+/// non-empty entry contains information of exactly one position.
 
-void TranspositionTable::set_size(unsigned mbSize) {
+void TranspositionTable::set_size(size_t mbSize) {
 
-  assert(mbSize >= 4 && mbSize <= 4096);
+  size_t newSize = 1ULL << msb((mbSize << 20) / sizeof(TTCluster));
 
-  unsigned newSize = 1024;
+  if (newSize == size)
+      return;
 
-  // We store a cluster of 4 TTEntry for each position and newSize is
-  // the maximum number of storable positions
-  while ((2 * newSize) * 4 * (sizeof(TTEntry)) <= (mbSize << 20))
-      newSize *= 2;
-
-  if (newSize != size)
-  {
   size = newSize;
   delete [] entries;
-      entries = new TTEntry[size * 4];
+  entries = new (std::nothrow) TTCluster[size];
+
   if (!entries)
   {
       std::cerr << "Failed to allocate " << mbSize
                 << "MB for transposition table." << std::endl;
       exit(EXIT_FAILURE);
   }
-      clear();
+
-  }
+  clear(); // Operator new is not guaranteed to initialize memory to zero
 }
 
 
-/// TranspositionTable::clear overwrites the entire transposition table
+/// TranspositionTable::clear() overwrites the entire transposition table
 /// with zeroes. It is called whenever the table is resized, or when the
 /// user asks the program to clear the table (from the UCI interface).
-/// Perhaps we should also clear it when the "ucinewgame" command is recieved?
 
 void TranspositionTable::clear() {
 
-  memset(entries, 0, size * 4 * sizeof(TTEntry));
+  memset(entries, 0, size * sizeof(TTCluster));
 }
 
 
-/// TranspositionTable::store writes a new entry containing a position,
+/// TranspositionTable::store() writes a new entry containing position key and
-/// a value, a value type, a search depth, and a best move to the
+/// valuable information of current position. The lowest order bits of position
-/// transposition table. Transposition table is organized in clusters of
+/// key are used to decide on which cluster the position will be placed.
-/// four TTEntry objects, and when a new entry is written, it replaces
+/// When a new entry is written and there are no empty entries available in cluster,
-/// the least valuable of the four entries in a cluster. A TTEntry t1 is
+/// it replaces the least valuable of entries. A TTEntry t1 is considered to be
-/// considered to be more valuable than a TTEntry t2 if t1 is from the
+/// more valuable than a TTEntry t2 if t1 is from the current search and t2 is from
-/// current search and t2 is from a previous search, or if the depth of t1
+/// a previous search, or if the depth of t1 is bigger than the depth of t2.
-/// is bigger than the depth of t2. A TTEntry of type VALUE_TYPE_EVAL
-/// never replaces another entry for the same position.
 
-void TranspositionTable::store(const Position& p, Value v, ValueType t, Depth d, Move m) {
+void TranspositionTable::store(const Key posKey, Value v, Bound t, Depth d, Move m, Value statV, Value kingD) {
 
+  int c1, c2, c3;
   TTEntry *tte, *replace;
+  uint32_t posKey32 = posKey >> 32; // Use the high 32 bits as key inside the cluster
 
-  tte = replace = first_entry(p);
+  tte = replace = first_entry(posKey);
-  for (int i = 0; i < 4; i++, tte++)
-  {
-      if (!tte->key() || tte->key() == p.get_key()) // empty or overwrite old
-      {
-          // Do not overwrite when new type is VALUE_TYPE_EVAL
-          if (tte->key() && t == VALUE_TYPE_EVAL)
-              return;
 
+  for (int i = 0; i < ClusterSize; i++, tte++)
+  {
+      if (!tte->key() || tte->key() == posKey32) // Empty or overwrite old
+      {
+          // Preserve any existing ttMove
           if (m == MOVE_NONE)
               m = tte->move();
 
-          *tte = TTEntry(p.get_key(), v, t, d, m, generation);
+          tte->save(posKey32, v, t, d, m, generation, statV, kingD);
           return;
       }
-      else if (i == 0)  // replace would be a no-op in this common case
-          continue;
 
-      int c1 = (replace->generation() == generation ?  2 : 0);
+      // Implement replace strategy
-      int c2 = (tte->generation() == generation ? -2 : 0);
+      c1 = (replace->generation() == generation ?  2 : 0);
-      int c3 = (tte->depth() < replace->depth() ?  1 : 0);
+      c2 = (tte->generation() == generation || tte->type() == BOUND_EXACT ? -2 : 0);
+      c3 = (tte->depth() < replace->depth() ?  1 : 0);
 
       if (c1 + c2 + c3 > 0)
           replace = tte;
   }
-  *replace = TTEntry(p.get_key(), v, t, d, m, generation);
+  replace->save(posKey32, v, t, d, m, generation, statV, kingD);
-  writes++;
 }
 
 
-/// TranspositionTable::retrieve looks up the current position in the
+/// TranspositionTable::probe() looks up the current position in the
-/// transposition table. Returns a pointer to the TTEntry or NULL
+/// transposition table. Returns a pointer to the TTEntry or NULL if
-/// if position is not found.
+/// position is not found.
 
-TTEntry* TranspositionTable::retrieve(const Position& pos) const {
+TTEntry* TranspositionTable::probe(const Key posKey) const {
 
-  TTEntry *tte = first_entry(pos);
+  uint32_t posKey32 = posKey >> 32;
+  TTEntry* tte = first_entry(posKey);
 
-  for (int i = 0; i < 4; i++, tte++)
+  for (int i = 0; i < ClusterSize; i++, tte++)
-      if (tte->key() == pos.get_key())
+      if (tte->key() == posKey32)
           return tte;
 
   return NULL;
 }
 
 
-/// TranspositionTable::first_entry returns a pointer to the first
-/// entry of a cluster given a position.
-
-inline TTEntry* TranspositionTable::first_entry(const Position& pos) const {
-
-  return entries + (int(pos.get_key() & (size - 1)) << 2);
-}
-
 /// TranspositionTable::new_search() is called at the beginning of every new
 /// search. It increments the "generation" variable, which is used to
 /// distinguish transposition table entries from previous searches from
 /// entries from the current search.
 
 void TranspositionTable::new_search() {
-
   generation++;
-  writes = 0;
-}
-
-
-/// TranspositionTable::insert_pv() is called at the end of a search
-/// iteration, and inserts the PV back into the PV. This makes sure
-/// the old PV moves are searched first, even if the old TT entries
-/// have been overwritten.
-
-void TranspositionTable::insert_pv(const Position& pos, Move pv[]) {
-
-  StateInfo st;
-  Position p(pos);
-
-  for (int i = 0; pv[i] != MOVE_NONE; i++)
-  {
-      store(p, VALUE_NONE, VALUE_TYPE_NONE, Depth(-127*OnePly), pv[i]);
-      p.do_move(pv[i], st);
-  }
-}
-
-
-/// TranspositionTable::full() returns the permill of all transposition table
-/// entries which have received at least one write during the current search.
-/// It is used to display the "info hashfull ..." information in UCI.
-
-int TranspositionTable::full() const {
-
-  double N = double(size) * 4.0;
-  return int(1000 * (1 - exp(writes * log(1.0 - 1.0/N))));
 }

src/tt.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,84 +17,120 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(TT_H_INCLUDED)
 #define TT_H_INCLUDED
 
-////
+#include "misc.h"
-//// Includes
+#include "types.h"
-////
 
-#include "depth.h"
+/// The TTEntry is the class of transposition table entries
-#include "position.h"
-#include "value.h"
-
-
-////
-//// Types
-////
-
-/// The TTEntry class is the class of transposition table entries
 ///
 /// A TTEntry needs 128 bits to be stored
 ///
-/// bit    0-63: key
+/// bit  0-31: key
-/// bit   64-95: data
+/// bit 32-63: data
-/// bit  96-111: value
+/// bit 64-79: value
-/// bit 112-127: depth
+/// bit 80-95: depth
+/// bit 96-111: static value
+/// bit 112-127: margin of static value
 ///
 /// the 32 bits of the data field are so defined
 ///
-/// bit  0-16: move
+/// bit  0-15: move
-/// bit 17-19: not used
+/// bit 16-20: not used
-/// bit 20-22: value type
+/// bit 21-22: value type
 /// bit 23-31: generation
 
 class TTEntry {
 
 public:
-  TTEntry() {}
+  void save(uint32_t k, Value v, Bound b, Depth d, Move m, int g, Value statV, Value statM) {
-  TTEntry(Key k, Value v, ValueType t, Depth d, Move m, int generation)
-        : key_ (k), data((m & 0x1FFFF) | (t << 20) | (generation << 23)),
-          value_(int16_t(v)), depth_(int16_t(d)) {}
 
-  Key key() const { return key_; }
+    key32        = (uint32_t)k;
-  Depth depth() const { return Depth(depth_); }
+    move16       = (uint16_t)m;
-  Move move() const { return Move(data & 0x1FFFF); }
+    bound        = (uint8_t)b;
-  Value value() const { return Value(value_); }
+    generation8  = (uint8_t)g;
-  ValueType type() const { return ValueType((data >> 20) & 7); }
+    value16      = (int16_t)v;
-  int generation() const { return (data >> 23); }
+    depth16      = (int16_t)d;
+    staticValue  = (int16_t)statV;
+    staticMargin = (int16_t)statM;
+  }
+  void set_generation(int g) { generation8 = (uint8_t)g; }
+
+  uint32_t key() const              { return key32; }
+  Depth depth() const               { return (Depth)depth16; }
+  Move move() const                 { return (Move)move16; }
+  Value value() const               { return (Value)value16; }
+  Bound type() const                { return (Bound)bound; }
+  int generation() const            { return (int)generation8; }
+  Value static_value() const        { return (Value)staticValue; }
+  Value static_value_margin() const { return (Value)staticMargin; }
 
 private:
-  Key key_;
+  uint32_t key32;
-  uint32_t data;
+  uint16_t move16;
-  int16_t value_;
+  uint8_t bound, generation8;
-  int16_t depth_;
+  int16_t value16, depth16, staticValue, staticMargin;
 };
 
-/// The transposition table class.  This is basically just a huge array
+
-/// containing TTEntry objects, and a few methods for writing new entries
+/// This is the number of TTEntry slots for each cluster
-/// and reading new ones.
+const int ClusterSize = 4;
+
+
+/// TTCluster consists of ClusterSize number of TTEntries. Size of TTCluster
+/// must not be bigger than a cache line size. In case it is less, it should
+/// be padded to guarantee always aligned accesses.
+
+struct TTCluster {
+  TTEntry data[ClusterSize];
+};
+
+
+/// The transposition table class. This is basically just a huge array containing
+/// TTCluster objects, and a few methods for writing and reading entries.
 
 class TranspositionTable {
 
+  TranspositionTable(const TranspositionTable&);
+  TranspositionTable& operator=(const TranspositionTable&);
+
 public:
   TranspositionTable();
   ~TranspositionTable();
-  void set_size(unsigned mbSize);
+  void set_size(size_t mbSize);
   void clear();
-  void store(const Position& pos, Value v, ValueType type, Depth d, Move m);
+  void store(const Key posKey, Value v, Bound type, Depth d, Move m, Value statV, Value kingD);
-  TTEntry* retrieve(const Position& pos) const;
+  TTEntry* probe(const Key posKey) const;
   void new_search();
-  void insert_pv(const Position& pos, Move pv[]);
+  TTEntry* first_entry(const Key posKey) const;
-  int full() const;
+  void refresh(const TTEntry* tte) const;
 
 private:
-  inline TTEntry* first_entry(const Position& pos) const;
+  size_t size;
-
+  TTCluster* entries;
-  unsigned size, writes;
+  uint8_t generation; // Size must be not bigger then TTEntry::generation8
-  TTEntry* entries;
-  uint8_t generation;
 };
 
+extern TranspositionTable TT;
+
+
+/// TranspositionTable::first_entry() returns a pointer to the first entry of
+/// a cluster given a position. The lowest order bits of the key are used to
+/// get the index of the cluster.
+
+inline TTEntry* TranspositionTable::first_entry(const Key posKey) const {
+
+  return entries[((uint32_t)posKey) & (size - 1)].data;
+}
+
+
+/// TranspositionTable::refresh() updates the 'generation' value of the TTEntry
+/// to avoid aging. Normally called after a TT hit.
+
+inline void TranspositionTable::refresh(const TTEntry* tte) const {
+
+  const_cast<TTEntry*>(tte)->set_generation(generation);
+}
+
 #endif // !defined(TT_H_INCLUDED)

src/types.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,31 +17,477 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(TYPES_H_INCLUDED)
 #define TYPES_H_INCLUDED
 
-#if !defined(_MSC_VER)
+/// For Linux and OSX configuration is done automatically using Makefile. To get
+/// started type 'make help'.
+///
+/// For Windows, part of the configuration is detected automatically, but some
+/// switches need to be set manually:
+///
+/// -DNDEBUG      | Disable debugging mode. Use always.
+///
+/// -DNO_PREFETCH | Disable use of prefetch asm-instruction. A must if you want
+///               | the executable to run on some very old machines.
+///
+/// -DUSE_POPCNT  | Add runtime support for use of popcnt asm-instruction. Works
+///               | only in 64-bit mode. For compiling requires hardware with
+///               | popcnt support.
 
-#include <inttypes.h>
+#include <cctype>
+#include <climits>
+#include <cstdlib>
+
+#include "platform.h"
+
+#if defined(_WIN64)
+#  include <intrin.h> // MSVC popcnt and bsfq instrinsics
+#  define IS_64BIT
+#  define USE_BSFQ
+#endif
+
+#if defined(USE_POPCNT) && defined(_MSC_VER) && defined(__INTEL_COMPILER)
+#  include <nmmintrin.h> // Intel header for _mm_popcnt_u64() intrinsic
+#endif
+
+#if defined(_MSC_VER) || defined(__INTEL_COMPILER)
+#  define CACHE_LINE_ALIGNMENT __declspec(align(64))
+#else
+#  define CACHE_LINE_ALIGNMENT  __attribute__ ((aligned(64)))
+#endif
+
+#if defined(_MSC_VER)
+#  define FORCE_INLINE  __forceinline
+#elif defined(__GNUC__)
+#  define FORCE_INLINE  inline __attribute__((always_inline))
+#else
+#  define FORCE_INLINE  inline
+#endif
+
+#if defined(USE_POPCNT)
+const bool HasPopCnt = true;
+#else
+const bool HasPopCnt = false;
+#endif
+
+#if defined(IS_64BIT)
+const bool Is64Bit = true;
+#else
+const bool Is64Bit = false;
+#endif
+
+typedef uint64_t Key;
+typedef uint64_t Bitboard;
+
+const int MAX_MOVES      = 192;
+const int MAX_PLY        = 100;
+const int MAX_PLY_PLUS_2 = MAX_PLY + 2;
+
+const Bitboard FileABB = 0x0101010101010101ULL;
+const Bitboard FileBBB = FileABB << 1;
+const Bitboard FileCBB = FileABB << 2;
+const Bitboard FileDBB = FileABB << 3;
+const Bitboard FileEBB = FileABB << 4;
+const Bitboard FileFBB = FileABB << 5;
+const Bitboard FileGBB = FileABB << 6;
+const Bitboard FileHBB = FileABB << 7;
+
+const Bitboard Rank1BB = 0xFF;
+const Bitboard Rank2BB = Rank1BB << (8 * 1);
+const Bitboard Rank3BB = Rank1BB << (8 * 2);
+const Bitboard Rank4BB = Rank1BB << (8 * 3);
+const Bitboard Rank5BB = Rank1BB << (8 * 4);
+const Bitboard Rank6BB = Rank1BB << (8 * 5);
+const Bitboard Rank7BB = Rank1BB << (8 * 6);
+const Bitboard Rank8BB = Rank1BB << (8 * 7);
+
+
+/// A move needs 16 bits to be stored
+///
+/// bit  0- 5: destination square (from 0 to 63)
+/// bit  6-11: origin square (from 0 to 63)
+/// bit 12-13: promotion piece type - 2 (from KNIGHT-2 to QUEEN-2)
+/// bit 14-15: special move flag: promotion (1), en passant (2), castle (3)
+///
+/// Special cases are MOVE_NONE and MOVE_NULL. We can sneak these in because in
+/// any normal move destination square is always different from origin square
+/// while MOVE_NONE and MOVE_NULL have the same origin and destination square.
+
+enum Move {
+  MOVE_NONE = 0,
+  MOVE_NULL = 65
+};
+
+enum MoveType {
+  NORMAL    = 0,
+  PROMOTION = 1 << 14,
+  ENPASSANT = 2 << 14,
+  CASTLE    = 3 << 14
+};
+
+enum CastleRight {  // Defined as in PolyGlot book hash key
+  CASTLES_NONE = 0,
+  WHITE_OO     = 1,
+  WHITE_OOO    = 2,
+  BLACK_OO     = 4,
+  BLACK_OOO    = 8,
+  ALL_CASTLES  = 15
+};
+
+enum CastlingSide {
+  KING_SIDE,
+  QUEEN_SIDE
+};
+
+enum ScaleFactor {
+  SCALE_FACTOR_DRAW   = 0,
+  SCALE_FACTOR_NORMAL = 64,
+  SCALE_FACTOR_MAX    = 128,
+  SCALE_FACTOR_NONE   = 255
+};
+
+enum Bound {
+  BOUND_NONE  = 0,
+  BOUND_UPPER = 1,
+  BOUND_LOWER = 2,
+  BOUND_EXACT = BOUND_UPPER | BOUND_LOWER
+};
+
+enum Value {
+  VALUE_ZERO      = 0,
+  VALUE_DRAW      = 0,
+  VALUE_KNOWN_WIN = 15000,
+  VALUE_MATE      = 30000,
+  VALUE_INFINITE  = 30001,
+  VALUE_NONE      = 30002,
+
+  VALUE_MATE_IN_MAX_PLY  =  VALUE_MATE - MAX_PLY,
+  VALUE_MATED_IN_MAX_PLY = -VALUE_MATE + MAX_PLY,
+
+  VALUE_ENSURE_INTEGER_SIZE_P = INT_MAX,
+  VALUE_ENSURE_INTEGER_SIZE_N = INT_MIN,
+
+  Mg = 0, Eg = 1,
+
+  PawnValueMg   = 198,   PawnValueEg   = 258,
+  KnightValueMg = 817,   KnightValueEg = 846,
+  BishopValueMg = 836,   BishopValueEg = 857,
+  RookValueMg   = 1270,  RookValueEg   = 1278,
+  QueenValueMg  = 2521,  QueenValueEg  = 2558
+};
+
+enum PieceType {
+  NO_PIECE_TYPE = 0, ALL_PIECES = 0,
+  PAWN = 1, KNIGHT = 2, BISHOP = 3, ROOK = 4, QUEEN = 5, KING = 6
+};
+
+enum Piece {
+  NO_PIECE = 16, // color_of(NO_PIECE) == NO_COLOR
+  W_PAWN = 1, W_KNIGHT =  2, W_BISHOP =  3, W_ROOK =  4, W_QUEEN =  5, W_KING =  6,
+  B_PAWN = 9, B_KNIGHT = 10, B_BISHOP = 11, B_ROOK = 12, B_QUEEN = 13, B_KING = 14
+};
+
+enum Color {
+  WHITE, BLACK, NO_COLOR
+};
+
+enum Depth {
+
+  ONE_PLY = 2,
+
+  DEPTH_ZERO          =  0 * ONE_PLY,
+  DEPTH_QS_CHECKS     = -1 * ONE_PLY,
+  DEPTH_QS_NO_CHECKS  = -2 * ONE_PLY,
+  DEPTH_QS_RECAPTURES = -5 * ONE_PLY,
+
+  DEPTH_NONE = -127 * ONE_PLY
+};
+
+enum Square {
+  SQ_A1, SQ_B1, SQ_C1, SQ_D1, SQ_E1, SQ_F1, SQ_G1, SQ_H1,
+  SQ_A2, SQ_B2, SQ_C2, SQ_D2, SQ_E2, SQ_F2, SQ_G2, SQ_H2,
+  SQ_A3, SQ_B3, SQ_C3, SQ_D3, SQ_E3, SQ_F3, SQ_G3, SQ_H3,
+  SQ_A4, SQ_B4, SQ_C4, SQ_D4, SQ_E4, SQ_F4, SQ_G4, SQ_H4,
+  SQ_A5, SQ_B5, SQ_C5, SQ_D5, SQ_E5, SQ_F5, SQ_G5, SQ_H5,
+  SQ_A6, SQ_B6, SQ_C6, SQ_D6, SQ_E6, SQ_F6, SQ_G6, SQ_H6,
+  SQ_A7, SQ_B7, SQ_C7, SQ_D7, SQ_E7, SQ_F7, SQ_G7, SQ_H7,
+  SQ_A8, SQ_B8, SQ_C8, SQ_D8, SQ_E8, SQ_F8, SQ_G8, SQ_H8,
+  SQ_NONE,
+
+  DELTA_N =  8,
+  DELTA_E =  1,
+  DELTA_S = -8,
+  DELTA_W = -1,
+
+  DELTA_NN = DELTA_N + DELTA_N,
+  DELTA_NE = DELTA_N + DELTA_E,
+  DELTA_SE = DELTA_S + DELTA_E,
+  DELTA_SS = DELTA_S + DELTA_S,
+  DELTA_SW = DELTA_S + DELTA_W,
+  DELTA_NW = DELTA_N + DELTA_W
+};
+
+enum File {
+  FILE_A, FILE_B, FILE_C, FILE_D, FILE_E, FILE_F, FILE_G, FILE_H
+};
+
+enum Rank {
+  RANK_1, RANK_2, RANK_3, RANK_4, RANK_5, RANK_6, RANK_7, RANK_8
+};
+
+
+/// Score enum keeps a midgame and an endgame value in a single integer (enum),
+/// first LSB 16 bits are used to store endgame value, while upper bits are used
+/// for midgame value. Compiler is free to choose the enum type as long as can
+/// keep its data, so ensure Score to be an integer type.
+enum Score {
+  SCORE_ZERO = 0,
+  SCORE_ENSURE_INTEGER_SIZE_P = INT_MAX,
+  SCORE_ENSURE_INTEGER_SIZE_N = INT_MIN
+};
+
+inline Score make_score(int mg, int eg) { return Score((mg << 16) + eg); }
+
+/// Extracting the signed lower and upper 16 bits it not so trivial because
+/// according to the standard a simple cast to short is implementation defined
+/// and so is a right shift of a signed integer.
+inline Value mg_value(Score s) { return Value(((s + 32768) & ~0xffff) / 0x10000); }
+
+/// On Intel 64 bit we have a small speed regression with the standard conforming
+/// version, so use a faster code in this case that, although not 100% standard
+/// compliant it seems to work for Intel and MSVC.
+#if defined(IS_64BIT) && (!defined(__GNUC__) || defined(__INTEL_COMPILER))
+
+inline Value eg_value(Score s) { return Value(int16_t(s & 0xffff)); }
 
 #else
 
-typedef __int8 int8_t;
+inline Value eg_value(Score s) {
-typedef unsigned __int8 uint8_t;
+  return Value((int)(unsigned(s) & 0x7fffu) - (int)(unsigned(s) & 0x8000u));
-typedef __int16 int16;
+}
-typedef unsigned __int16 uint16_t;
-typedef __int32 int32;
-typedef unsigned __int32 uint32_t;
-typedef __int64 int64;
-typedef unsigned __int64 uint64_t;
 
-typedef __int16 int16_t;
+#endif
-typedef __int64 int64_t;
 
-#endif // !defined(_MSC_VER)
+#define ENABLE_SAFE_OPERATORS_ON(T)                                         \
+inline T operator+(const T d1, const T d2) { return T(int(d1) + int(d2)); } \
+inline T operator-(const T d1, const T d2) { return T(int(d1) - int(d2)); } \
+inline T operator*(int i, const T d) { return T(i * int(d)); }              \
+inline T operator*(const T d, int i) { return T(int(d) * i); }              \
+inline T operator-(const T d) { return T(-int(d)); }                        \
+inline T& operator+=(T& d1, const T d2) { d1 = d1 + d2; return d1; }        \
+inline T& operator-=(T& d1, const T d2) { d1 = d1 - d2; return d1; }        \
+inline T& operator*=(T& d, int i) { d = T(int(d) * i); return d; }
 
-// Hash keys:
+#define ENABLE_OPERATORS_ON(T) ENABLE_SAFE_OPERATORS_ON(T)                  \
-typedef uint64_t Key;
+inline T operator++(T& d, int) { d = T(int(d) + 1); return d; }             \
+inline T operator--(T& d, int) { d = T(int(d) - 1); return d; }             \
+inline T operator/(const T d, int i) { return T(int(d) / i); }              \
+inline T& operator/=(T& d, int i) { d = T(int(d) / i); return d; }
+
+ENABLE_OPERATORS_ON(Value)
+ENABLE_OPERATORS_ON(PieceType)
+ENABLE_OPERATORS_ON(Piece)
+ENABLE_OPERATORS_ON(Color)
+ENABLE_OPERATORS_ON(Depth)
+ENABLE_OPERATORS_ON(Square)
+ENABLE_OPERATORS_ON(File)
+ENABLE_OPERATORS_ON(Rank)
+
+/// Added operators for adding integers to a Value
+inline Value operator+(Value v, int i) { return Value(int(v) + i); }
+inline Value operator-(Value v, int i) { return Value(int(v) - i); }
+
+ENABLE_SAFE_OPERATORS_ON(Score)
+
+/// Only declared but not defined. We don't want to multiply two scores due to
+/// a very high risk of overflow. So user should explicitly convert to integer.
+inline Score operator*(Score s1, Score s2);
+
+/// Division of a Score must be handled separately for each term
+inline Score operator/(Score s, int i) {
+  return make_score(mg_value(s) / i, eg_value(s) / i);
+}
+
+/// Weight score v by score w trying to prevent overflow
+inline Score apply_weight(Score v, Score w) {
+  return make_score((int(mg_value(v)) * mg_value(w)) / 0x100,
+                    (int(eg_value(v)) * eg_value(w)) / 0x100);
+}
+
+#undef ENABLE_OPERATORS_ON
+#undef ENABLE_SAFE_OPERATORS_ON
+
+namespace Zobrist {
+
+  extern Key psq[2][8][64]; // [color][pieceType][square / piece count]
+  extern Key enpassant[8];  // [file]
+  extern Key castle[16];    // [castleRight]
+  extern Key side;
+  extern Key exclusion;
+
+  void init();
+}
+
+CACHE_LINE_ALIGNMENT
+
+extern Score pieceSquareTable[16][64]; // [piece][square]
+extern Value PieceValue[2][18];        // [Mg / Eg][piece / pieceType]
+extern int SquareDistance[64][64];     // [square][square]
+
+struct MoveStack {
+  Move move;
+  int score;
+};
+
+inline bool operator<(const MoveStack& f, const MoveStack& s) {
+  return f.score < s.score;
+}
+
+inline Color operator~(Color c) {
+  return Color(c ^ 1);
+}
+
+inline Square operator~(Square s) {
+  return Square(s ^ 56); // Vertical flip SQ_A1 -> SQ_A8
+}
+
+inline Square operator|(File f, Rank r) {
+  return Square((r << 3) | f);
+}
+
+inline Value mate_in(int ply) {
+  return VALUE_MATE - ply;
+}
+
+inline Value mated_in(int ply) {
+  return -VALUE_MATE + ply;
+}
+
+inline Piece make_piece(Color c, PieceType pt) {
+  return Piece((c << 3) | pt);
+}
+
+inline CastleRight make_castle_right(Color c, CastlingSide s) {
+  return CastleRight(WHITE_OO << ((s == QUEEN_SIDE) + 2 * c));
+}
+
+inline PieceType type_of(Piece p)  {
+  return PieceType(p & 7);
+}
+
+inline Color color_of(Piece p) {
+  return Color(p >> 3);
+}
+
+inline bool is_ok(Square s) {
+  return s >= SQ_A1 && s <= SQ_H8;
+}
+
+inline File file_of(Square s) {
+  return File(s & 7);
+}
+
+inline Rank rank_of(Square s) {
+  return Rank(s >> 3);
+}
+
+inline Square mirror(Square s) {
+  return Square(s ^ 7); // Horizontal flip SQ_A1 -> SQ_H1
+}
+
+inline Square relative_square(Color c, Square s) {
+  return Square(s ^ (c * 56));
+}
+
+inline Rank relative_rank(Color c, Rank r) {
+  return Rank(r ^ (c * 7));
+}
+
+inline Rank relative_rank(Color c, Square s) {
+  return relative_rank(c, rank_of(s));
+}
+
+inline bool opposite_colors(Square s1, Square s2) {
+  int s = int(s1) ^ int(s2);
+  return ((s >> 3) ^ s) & 1;
+}
+
+inline int file_distance(Square s1, Square s2) {
+  return abs(file_of(s1) - file_of(s2));
+}
+
+inline int rank_distance(Square s1, Square s2) {
+  return abs(rank_of(s1) - rank_of(s2));
+}
+
+inline int square_distance(Square s1, Square s2) {
+  return SquareDistance[s1][s2];
+}
+
+inline char file_to_char(File f) {
+  return char(f - FILE_A + int('a'));
+}
+
+inline char rank_to_char(Rank r) {
+  return char(r - RANK_1 + int('1'));
+}
+
+inline Square pawn_push(Color c) {
+  return c == WHITE ? DELTA_N : DELTA_S;
+}
+
+inline Square from_sq(Move m) {
+  return Square((m >> 6) & 0x3F);
+}
+
+inline Square to_sq(Move m) {
+  return Square(m & 0x3F);
+}
+
+inline MoveType type_of(Move m) {
+  return MoveType(m & (3 << 14));
+}
+
+inline PieceType promotion_type(Move m) {
+  return PieceType(((m >> 12) & 3) + 2);
+}
+
+inline Move make_move(Square from, Square to) {
+  return Move(to | (from << 6));
+}
+
+template<MoveType T>
+inline Move make(Square from, Square to, PieceType pt = KNIGHT) {
+  return Move(to | (from << 6) | T | ((pt - KNIGHT) << 12)) ;
+}
+
+inline bool is_ok(Move m) {
+  return from_sq(m) != to_sq(m); // Catches also MOVE_NULL and MOVE_NONE
+}
+
+#include <string>
+
+inline const std::string square_to_string(Square s) {
+  char ch[] = { file_to_char(file_of(s)), rank_to_char(rank_of(s)), 0 };
+  return ch;
+}
+
+/// Our insertion sort implementation, works with pointers and iterators and is
+/// guaranteed to be stable, as is needed.
+template<typename T, typename K>
+void sort(K first, K last)
+{
+  T tmp;
+  K p, q;
+
+  for (p = first + 1; p < last; p++)
+  {
+      tmp = *p;
+      for (q = p; q != first && *(q-1) < tmp; --q)
+          *q = *(q-1);
+      *q = tmp;
+  }
+}
 
 #endif // !defined(TYPES_H_INCLUDED)

src/uci.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,317 +17,236 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-////
-//// Includes
-////
-
-#include <cassert>
 #include <iostream>
 #include <sstream>
 #include <string>
 
-#include "book.h"
 #include "evaluate.h"
-#include "misc.h"
+#include "notation.h"
-#include "move.h"
-#include "movegen.h"
 #include "position.h"
-#include "san.h"
 #include "search.h"
-#include "uci.h"
+#include "thread.h"
+#include "tt.h"
 #include "ucioption.h"
 
+using namespace std;
 
-////
+extern void benchmark(const Position& pos, istream& is);
-//// Local definitions:
-////
 
 namespace {
 
-  // UCIInputParser is a class for parsing UCI input.  The class
+  // FEN string of the initial position, normal chess
-  // is actually a string stream built on a given input string.
+  const char* StartFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
 
-  typedef std::istringstream UCIInputParser;
+  // Keep track of position keys along the setup moves (from start position to the
+  // position just before to start searching). Needed by repetition draw detection.
+  Search::StateStackPtr SetupStates;
 
-  // The root position.  This is set up when the user (or in practice, the GUI)
+  void set_option(istringstream& up);
-  // sends the "position" UCI command.  The root position is sent to the think()
+  void set_position(Position& pos, istringstream& up);
-  // function when the program receives the "go" command.
+  void go(Position& pos, istringstream& up);
-  Position RootPosition;
-
-  // Local functions
-  void get_command();
-  void handle_command(const std::string &command);
-  void set_option(UCIInputParser &uip);
-  void set_position(UCIInputParser &uip);
-  void go(UCIInputParser &uip);
 }
 
 
-////
+/// Wait for a command from the user, parse this text string as an UCI command,
-//// Functions
+/// and call the appropriate functions. Also intercepts EOF from stdin to ensure
-////
+/// that we exit gracefully if the GUI dies unexpectedly. In addition to the UCI
+/// commands, the function also supports a few debug commands.
 
-/// uci_main_loop() is the only global function in this file.  It is
+void UCI::loop(const string& args) {
-/// called immediately after the program has finished initializing.
-/// The program remains in this loop until it receives the "quit" UCI
-/// command.
 
-void uci_main_loop() {
+  Position pos(StartFEN, false, Threads.main_thread()); // The root position
+  string cmd, token;
 
-  RootPosition.from_fen(StartPosition);
+  while (token != "quit")
-
-  while (1)
-      get_command();
-}
-
-
-////
-//// Local functions
-////
-
-namespace {
-
-  // get_command() waits for a command from the user, and passes
-  // this command to handle_command.  get_command also intercepts
-  // EOF from stdin, by translating EOF to the "quit" command.  This
-  // ensures that Stockfish exits gracefully if the GUI dies
-  // unexpectedly.
-
-  void get_command() {
-
-    std::string command;
-
-    if (!std::getline(std::cin, command))
-        command = "quit";
-
-    handle_command(command);
-  }
-
-
-  // handle_command() takes a text string as input, uses a
-  // UCIInputParser object to parse this text string as a UCI command,
-  // and calls the appropriate functions.  In addition to the UCI
-  // commands, the function also supports a few debug commands.
-
-  void handle_command(const std::string &command) {
-
-    UCIInputParser uip(command);
-    std::string token;
-
-    uip >> token; // operator >> skips any whitespace
-
-    if (token == "quit")
   {
-        OpeningBook.close();
+      if (!args.empty())
-        stop_threads();
+          cmd = args;
-        quit_eval();
+
-        exit(0);
+      else if (!getline(cin, cmd)) // Block here waiting for input
-    }
+          cmd = "quit";
-    else if (token == "uci")
+
+      istringstream is(cmd);
+
+      is >> skipws >> token;
+
+      if (token == "quit" || token == "stop")
       {
-        std::cout << "id name " << engine_name() << std::endl
+          Search::Signals.stop = true;
-                  << "id author Tord Romstad, Marco Costalba"
+          Threads.wait_for_search_finished(); // Cannot quit while threads are running
-                  << std::endl;
-        print_uci_options();
-        std::cout << "uciok" << std::endl;
       }
-    else if (token == "ucinewgame")
+
+      else if (token == "ponderhit")
       {
-        TT.clear();
+          // The opponent has played the expected move. GUI sends "ponderhit" if
-        Position::init_piece_square_tables();
+          // we were told to ponder on the same move the opponent has played. We
-        RootPosition.from_fen(StartPosition);
+          // should continue searching but switching from pondering to normal search.
+          Search::Limits.ponder = false;
+
+          if (Search::Signals.stopOnPonderhit)
+          {
+              Search::Signals.stop = true;
+              Threads.main_thread()->wake_up(); // Could be sleeping
           }
-    else if (token == "isready")
+      }
-        std::cout << "readyok" << std::endl;
+
-    else if (token == "position")
-        set_position(uip);
-    else if (token == "setoption")
-        set_option(uip);
       else if (token == "go")
-        go(uip);
+          go(pos, is);
+
+      else if (token == "ucinewgame")
+          TT.clear();
+
+      else if (token == "isready")
+          sync_cout << "readyok" << sync_endl;
+
+      else if (token == "position")
+          set_position(pos, is);
+
+      else if (token == "setoption")
+          set_option(is);
 
-    // The remaining commands are for debugging purposes only.
-    // Perhaps they should be removed later in order to reduce the
-    // size of the program binary.
       else if (token == "d")
-        RootPosition.print();
+          pos.print();
+
       else if (token == "flip")
-    {
+          pos.flip();
-        Position p(RootPosition);
+
-        RootPosition.flipped_copy(p);
-    }
       else if (token == "eval")
-    {
+          sync_cout << Eval::trace(pos) << sync_endl;
-        EvalInfo ei;
+
-        std::cout << "Incremental mg: " << RootPosition.mg_value()
+      else if (token == "bench")
-                  << std::endl;
+          benchmark(pos, is);
-        std::cout << "Incremental eg: " << RootPosition.eg_value()
+
-                  << std::endl;
-        std::cout << "Full eval: "
-                  << evaluate(RootPosition, ei, 0)
-                  << std::endl;
-    }
       else if (token == "key")
+          sync_cout << "key: " << hex     << pos.key()
+                    << "\nmaterial key: " << pos.material_key()
+                    << "\npawn key: "     << pos.pawn_key() << sync_endl;
+
+      else if (token == "uci")
+          sync_cout << "id name " << engine_info(true)
+                    << "\n"       << Options
+                    << "\nuciok"  << sync_endl;
+
+      else if (token == "perft" && (is >> token)) // Read depth
       {
-        std::cout << "key: " << std::hex << RootPosition.get_key()
+          stringstream ss;
-                  << " material key: " << RootPosition.get_material_key()
+
-                  << " pawn key: " << RootPosition.get_pawn_key()
+          ss << Options["Hash"]    << " "
-                  << std::endl;
+             << Options["Threads"] << " " << token << " current perft";
+
+          benchmark(pos, ss);
       }
+
       else
+          sync_cout << "Unknown command: " << cmd << sync_endl;
+
+      if (!args.empty()) // Command line arguments have one-shot behaviour
       {
-        std::cout << "Unknown command: " << command << std::endl;
+          Threads.wait_for_search_finished();
-        while (!uip.eof())
+          break;
-        {
-            uip >> token;
-            std::cout << token << std::endl;
       }
   }
 }
 
 
-  // set_position() is called when Stockfish receives the "position" UCI
+namespace {
-  // command.  The input parameter is a UCIInputParser.  It is assumed
-  // that this parser has consumed the first token of the UCI command
-  // ("position"), and is ready to read the second token ("startpos"
-  // or "fen", if the input is well-formed).
 
-  void set_position(UCIInputParser &uip) {
+  // set_position() is called when engine receives the "position" UCI command.
+  // The function sets up the position described in the given fen string ("fen")
+  // or the starting position ("startpos") and then makes the moves given in the
+  // following move list ("moves").
 
-    std::string token;
+  void set_position(Position& pos, istringstream& is) {
 
-    uip >> token; // operator >> skips any whitespace
+    Move m;
+    string token, fen;
+
+    is >> token;
 
     if (token == "startpos")
-        RootPosition.from_fen(StartPosition);
+    {
+        fen = StartFEN;
+        is >> token; // Consume "moves" token if any
+    }
     else if (token == "fen")
-    {
+        while (is >> token && token != "moves")
-        std::string fen;
+            fen += token + " ";
-        while (token != "moves" && !uip.eof())
+    else
-        {
+        return;
-          uip >> token;
-          fen += token;
-          fen += ' ';
-        }
-        RootPosition.from_fen(fen);
-    }
 
-    if (!uip.eof())
+    pos.from_fen(fen, Options["UCI_Chess960"], Threads.main_thread());
-    {
+    SetupStates = Search::StateStackPtr(new std::stack<StateInfo>());
-        if (token != "moves")
-          uip >> token;
-        if (token == "moves")
-        {
-            Move move;
-            StateInfo st;
-            while (!uip.eof())
-            {
-                uip >> token;
-                move = move_from_string(RootPosition, token);
-                RootPosition.do_move(move, st);
-                if (RootPosition.rule_50_counter() == 0)
-                    RootPosition.reset_game_ply();
-            }
-            // Our StateInfo st is about going out of scope,
-            // so save its content before they disappear.
-            RootPosition.setStartState(st);
-        }
-    }
-  }
 
-
+    // Parse move list (if any)
-  // set_option() is called when Stockfish receives the "setoption" UCI
+    while (is >> token && (m = move_from_uci(pos, token)) != MOVE_NONE)
-  // command.  The input parameter is a UCIInputParser.  It is assumed
-  // that this parser has consumed the first token of the UCI command
-  // ("setoption"), and is ready to read the second token ("name", if
-  // the input is well-formed).
-
-  void set_option(UCIInputParser &uip) {
-
-    std::string token, name;
-
-    uip >> token;
-    if (token == "name")
     {
-        uip >> name;
+        SetupStates->push(StateInfo());
-        uip >> token;
+        pos.do_move(m, SetupStates->top());
-        while (!uip.eof() && token != "value")
-        {
-          name += (" " + token);
-          uip >> token;
-        }
-        if (token == "value")
-        {
-            std::getline(uip, token); // reads until end of line
-            set_option_value(name, token);
-        } else
-            push_button(name);
     }
   }
 
 
-  // go() is called when Stockfish receives the "go" UCI command.  The
+  // set_option() is called when engine receives the "setoption" UCI command. The
-  // input parameter is a UCIInputParser.  It is assumed that this
+  // function updates the UCI option ("name") to the given value ("value").
-  // parser has consumed the first token of the UCI command ("go"),
-  // and is ready to read the second token.  The function sets the
-  // thinking time and other parameters from the input string, and
-  // calls think() (defined in search.cpp) with the appropriate
-  // parameters.
 
-  void go(UCIInputParser &uip) {
+  void set_option(istringstream& is) {
 
-    std::string token;
+    string token, name, value;
 
-    int time[2] = {0, 0}, inc[2] = {0, 0};
+    is >> token; // Consume "name" token
-    int movesToGo = 0, depth = 0, nodes = 0, moveTime = 0;
-    bool infinite = false, ponder = false;
-    Move searchMoves[500];
 
-    searchMoves[0] = MOVE_NONE;
+    // Read option name (can contain spaces)
+    while (is >> token && token != "value")
+        name += string(" ", !name.empty()) + token;
 
-    while (!uip.eof())
+    // Read option value (can contain spaces)
+    while (is >> token)
+        value += string(" ", !value.empty()) + token;
+
+    if (Options.count(name))
+        Options[name] = value;
+    else
+        sync_cout << "No such option: " << name << sync_endl;
+  }
+
+
+  // go() is called when engine receives the "go" UCI command. The function sets
+  // the thinking time and other parameters from the input string, and then starts
+  // the search.
+
+  void go(Position& pos, istringstream& is) {
+
+    Search::LimitsType limits;
+    vector<Move> searchMoves;
+    string token;
+
+    while (is >> token)
     {
-        uip >> token;
+        if (token == "wtime")
-
+            is >> limits.time[WHITE];
-        if (token == "infinite")
-            infinite = true;
-        else if (token == "ponder")
-            ponder = true;
-        else if (token == "wtime")
-            uip >> time[0];
         else if (token == "btime")
-            uip >> time[1];
+            is >> limits.time[BLACK];
         else if (token == "winc")
-            uip >> inc[0];
+            is >> limits.inc[WHITE];
         else if (token == "binc")
-            uip >> inc[1];
+            is >> limits.inc[BLACK];
         else if (token == "movestogo")
-            uip >> movesToGo;
+            is >> limits.movestogo;
         else if (token == "depth")
-            uip >> depth;
+            is >> limits.depth;
         else if (token == "nodes")
-            uip >> nodes;
+            is >> limits.nodes;
         else if (token == "movetime")
-            uip >> moveTime;
+            is >> limits.movetime;
+        else if (token == "infinite")
+            limits.infinite = true;
+        else if (token == "ponder")
+            limits.ponder = true;
         else if (token == "searchmoves")
-        {
+            while (is >> token)
-            int numOfMoves = 0;
+                searchMoves.push_back(move_from_uci(pos, token));
-            while (!uip.eof())
-            {
-                uip >> token;
-                searchMoves[numOfMoves++] = move_from_string(RootPosition, token);
-            }
-            searchMoves[numOfMoves] = MOVE_NONE;
-        }
     }
 
-    if (moveTime)
+    Threads.start_searching(pos, limits, searchMoves, SetupStates);
-        infinite = true;  // HACK
-
-    assert(RootPosition.is_ok());
-
-    think(RootPosition, infinite, ponder, RootPosition.side_to_move(), time,
-          inc, movesToGo, depth, nodes, moveTime, searchMoves);
   }
 }

src/uci.h

@@ -1,31 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(UCI_H_INCLUDED)
-#define UCI_H_INCLUDED
-
-////
-//// Prototypes
-////
-
-extern void uci_main_loop();
-
-
-#endif // !defined(UCI_H_INCLUDED)

src/ucioption.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,333 +17,150 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-////
-//// Includes
-////
-
 #include <algorithm>
 #include <cassert>
-#include <map>
+#include <cstdlib>
-#include <string>
 #include <sstream>
-#include <vector>
 
+#include "evaluate.h"
 #include "misc.h"
 #include "thread.h"
+#include "tt.h"
 #include "ucioption.h"
 
+using std::string;
 
-////
+UCI::OptionsMap Options; // Global object
-//// Variables
-////
 
-bool Chess960;
+namespace UCI {
+
+/// 'On change' actions, triggered by an option's value change
+void on_logger(const Option& o) { start_logger(o); }
+void on_eval(const Option&) { Eval::init(); }
+void on_threads(const Option&) { Threads.read_uci_options(); }
+void on_hash_size(const Option& o) { TT.set_size(o); }
+void on_clear_hash(const Option&) { TT.clear(); }
 
 
-////
+/// Our case insensitive less() function as required by UCI protocol
-//// Local definitions
+bool ci_less(char c1, char c2) { return tolower(c1) < tolower(c2); }
-////
 
-namespace {
+bool CaseInsensitiveLess::operator() (const string& s1, const string& s2) const {
+  return std::lexicographical_compare(s1.begin(), s1.end(), s2.begin(), s2.end(), ci_less);
+}
 
-  ///
-  /// Types
-  ///
 
-  enum OptionType { SPIN, COMBO, CHECK, STRING, BUTTON };
+/// init() initializes the UCI options to their hard coded default values
+/// and initializes the default value of "Threads" and "Min Split Depth"
+/// parameters according to the number of CPU cores detected.
 
-  typedef std::vector<std::string> ComboValues;
+void init(OptionsMap& o) {
 
-  struct Option {
+  int cpus = std::min(cpu_count(), MAX_THREADS);
-
+  int msd = cpus < 8 ? 4 : 7;
-    std::string name, defaultValue, currentValue;
-    OptionType type;
-    size_t idx;
-    int minValue, maxValue;
-    ComboValues comboValues;
-
-    Option();
-    Option(const char* defaultValue, OptionType = STRING);
-    Option(bool defaultValue, OptionType = CHECK);
-    Option(int defaultValue, int minValue, int maxValue);
-
-    bool operator<(const Option& o) const { return this->idx < o.idx; }
-  };
-
-  typedef std::map<std::string, Option> Options;
-
-  ///
-  /// Constants
-  ///
-
-  // load_defaults populates the options map with the hard
-  // coded names and default values.
-
-  void load_defaults(Options& o) {
 
+  o["Use Debug Log"]               = Option(false, on_logger);
   o["Use Search Log"]              = Option(false);
   o["Search Log Filename"]         = Option("SearchLog.txt");
   o["Book File"]                   = Option("book.bin");
-    o["Mobility (Middle Game)"] = Option(100, 0, 200);
+  o["Best Book Move"]              = Option(false);
-    o["Mobility (Endgame)"] = Option(100, 0, 200);
+  o["Mobility (Middle Game)"]      = Option(100, 0, 200, on_eval);
-    o["Pawn Structure (Middle Game)"] = Option(100, 0, 200);
+  o["Mobility (Endgame)"]          = Option(100, 0, 200, on_eval);
-    o["Pawn Structure (Endgame)"] = Option(100, 0, 200);
+  o["Passed Pawns (Middle Game)"]  = Option(100, 0, 200, on_eval);
-    o["Passed Pawns (Middle Game)"] = Option(100, 0, 200);
+  o["Passed Pawns (Endgame)"]      = Option(100, 0, 200, on_eval);
-    o["Passed Pawns (Endgame)"] = Option(100, 0, 200);
+  o["Space"]                       = Option(100, 0, 200, on_eval);
-    o["Space"] = Option(100, 0, 200);
+  o["Aggressiveness"]              = Option(100, 0, 200, on_eval);
-    o["Aggressiveness"] = Option(100, 0, 200);
+  o["Cowardice"]                   = Option(100, 0, 200, on_eval);
-    o["Cowardice"] = Option(100, 0, 200);
+  o["Min Split Depth"]             = Option(msd, 4, 7, on_threads);
-    o["King Safety Curve"] = Option("Quadratic", COMBO);
+  o["Max Threads per Split Point"] = Option(5, 4, 8, on_threads);
-
+  o["Threads"]                     = Option(cpus, 1, MAX_THREADS, on_threads);
-       o["King Safety Curve"].comboValues.push_back("Quadratic");
+  o["Use Sleeping Threads"]        = Option(true, on_threads);
-       o["King Safety Curve"].comboValues.push_back("Linear");  /*, "From File"*/
+  o["Hash"]                        = Option(32, 4, 8192, on_hash_size);
-
+  o["Clear Hash"]                  = Option(on_clear_hash);
-    o["King Safety Coefficient"] = Option(40, 1, 100);
-    o["King Safety X Intercept"] = Option(0, 0, 20);
-    o["King Safety Max Slope"] = Option(30, 10, 100);
-    o["King Safety Max Value"] = Option(500, 100, 1000);
-    o["Queen Contact Check Bonus"] = Option(3, 0, 8);
-    o["Queen Check Bonus"] = Option(2, 0, 4);
-    o["Rook Check Bonus"] = Option(1, 0, 4);
-    o["Bishop Check Bonus"] = Option(1, 0, 4);
-    o["Knight Check Bonus"] = Option(1, 0, 4);
-    o["Discovered Check Bonus"] = Option(3, 0, 8);
-    o["Mate Threat Bonus"] = Option(3, 0, 8);
-    o["Check Extension (PV nodes)"] = Option(2, 0, 2);
-    o["Check Extension (non-PV nodes)"] = Option(1, 0, 2);
-    o["Single Reply Extension (PV nodes)"] = Option(2, 0, 2);
-    o["Single Reply Extension (non-PV nodes)"] = Option(2, 0, 2);
-    o["Mate Threat Extension (PV nodes)"] = Option(0, 0, 2);
-    o["Mate Threat Extension (non-PV nodes)"] = Option(0, 0, 2);
-    o["Pawn Push to 7th Extension (PV nodes)"] = Option(1, 0, 2);
-    o["Pawn Push to 7th Extension (non-PV nodes)"] = Option(1, 0, 2);
-    o["Passed Pawn Extension (PV nodes)"] = Option(1, 0, 2);
-    o["Passed Pawn Extension (non-PV nodes)"] = Option(0, 0, 2);
-    o["Pawn Endgame Extension (PV nodes)"] = Option(2, 0, 2);
-    o["Pawn Endgame Extension (non-PV nodes)"] = Option(2, 0, 2);
-    o["Full Depth Moves (PV nodes)"] = Option(14, 1, 100);
-    o["Full Depth Moves (non-PV nodes)"] = Option(3, 1, 100);
-    o["Threat Depth"] = Option(5, 0, 100);
-    o["Futility Pruning (Main Search)"] = Option(true);
-    o["Futility Pruning (Quiescence Search)"] = Option(true);
-    o["LSN filtering"] = Option(false);
-    o["LSN Time Margin (sec)"] = Option(4, 1, 10);
-    o["LSN Value Margin"] = Option(200, 100, 600);
-    o["Randomness"] = Option(0, 0, 10);
-    o["Minimum Split Depth"] = Option(4, 4, 7);
-    o["Maximum Number of Threads per Split Point"] = Option(5, 4, 8);
-    o["Threads"] = Option(1, 1, 8);
-    o["Hash"] = Option(32, 4, 4096);
-    o["Clear Hash"] = Option(false, BUTTON);
   o["Ponder"]                      = Option(true);
-    o["OwnBook"] = Option(true);
+  o["OwnBook"]                     = Option(false);
   o["MultiPV"]                     = Option(1, 1, 500);
-    o["UCI_ShowCurrLine"] = Option(false);
+  o["Skill Level"]                 = Option(20, 0, 20);
+  o["Emergency Move Horizon"]      = Option(40, 0, 50);
+  o["Emergency Base Time"]         = Option(200, 0, 30000);
+  o["Emergency Move Time"]         = Option(70, 0, 5000);
+  o["Minimum Thinking Time"]       = Option(20, 0, 5000);
+  o["Slow Mover"]                  = Option(100, 10, 1000);
   o["UCI_Chess960"]                = Option(false);
-
+  o["UCI_AnalyseMode"]             = Option(false, on_eval);
-    // Any option should know its name so to be easily printed
-    for (Options::iterator it = o.begin(); it != o.end(); ++it)
-        it->second.name = it->first;
-  }
-
-  ///
-  /// Variables
-  ///
-
-  Options options;
-
-  // stringify converts a value of type T to a std::string
-  template<typename T>
-  std::string stringify(const T& v) {
-
-     std::ostringstream ss;
-     ss << v;
-     return ss.str();
 }
 
 
-  // get_option_value implements the various get_option_value_<type>
+/// operator<<() is used to print all the options default values in chronological
-  // functions defined later, because only the option value
+/// insertion order (the idx field) and in the format defined by the UCI protocol.
-  // type changes a template seems a proper solution.
 
-  template<typename T>
+std::ostream& operator<<(std::ostream& os, const OptionsMap& om) {
-  T get_option_value(const std::string& optionName) {
 
-      T ret = T();
+  for (size_t idx = 0; idx < om.size(); idx++)
-      if (options.find(optionName) == options.end())
+      for (OptionsMap::const_iterator it = om.begin(); it != om.end(); ++it)
-          return ret;
+          if (it->second.idx == idx)
-
-      std::istringstream ss(options[optionName].currentValue);
-      ss >> ret;
-      return ret;
-  }
-
-}
-
-////
-//// Functions
-////
-
-/// init_uci_options() initializes the UCI options.  Currently, the only
-/// thing this function does is to initialize the default value of the
-/// "Threads" parameter to the number of available CPU cores.
-
-void init_uci_options() {
-
-  load_defaults(options);
-
-  // Limit the default value of "Threads" to 7 even if we have 8 CPU cores.
-  // According to Ken Dail's tests, Glaurung plays much better with 7 than
-  // with 8 threads.  This is weird, but it is probably difficult to find out
-  // why before I have a 8-core computer to experiment with myself.
-  assert(options.find("Threads") != options.end());
-  assert(options.find("Minimum Split Depth") != options.end());
-
-  options["Threads"].defaultValue = stringify(Min(cpu_count(), 7));
-  options["Threads"].currentValue = stringify(Min(cpu_count(), 7));
-
-  // Increase the minimum split depth when the number of CPUs is big.
-  // It would probably be better to let this depend on the number of threads
-  // instead.
-  if (cpu_count() > 4)
           {
-      options["Minimum Split Depth"].defaultValue = "6";
+              const Option& o = it->second;
-      options["Minimum Split Depth"].currentValue = "6";
+              os << "\noption name " << it->first << " type " << o.type;
+
+              if (o.type != "button")
+                  os << " default " << o.defaultValue;
+
+              if (o.type == "spin")
+                  os << " min " << o.min << " max " << o.max;
+
+              break;
           }
+  return os;
 }
 
 
-/// print_uci_options() prints all the UCI options to the standard output,
+/// Option c'tors and conversion operators
-/// in the format defined by the UCI protocol.
 
-void print_uci_options() {
+Option::Option(const char* v, Fn* f) : type("string"), min(0), max(0), idx(Options.size()), on_change(f)
+{ defaultValue = currentValue = v; }
 
-  static const char optionTypeName[][16] = {
+Option::Option(bool v, Fn* f) : type("check"), min(0), max(0), idx(Options.size()), on_change(f)
-    "spin", "combo", "check", "string", "button"
+{ defaultValue = currentValue = (v ? "true" : "false"); }
-  };
 
-  // Build up a vector out of the options map and sort it according to idx
+Option::Option(Fn* f) : type("button"), min(0), max(0), idx(Options.size()), on_change(f)
-  // field, that is the chronological insertion order in options map.
+{}
-  std::vector<Option> vec;
-  for (Options::const_iterator it = options.begin(); it != options.end(); ++it)
-      vec.push_back(it->second);
 
-  std::sort(vec.begin(), vec.end());
+Option::Option(int v, int minv, int maxv, Fn* f) : type("spin"), min(minv), max(maxv), idx(Options.size()), on_change(f)
+{ std::ostringstream ss; ss << v; defaultValue = currentValue = ss.str(); }
 
-  for (std::vector<Option>::const_iterator it = vec.begin(); it != vec.end(); ++it)
-  {
-      std::cout << "\noption name " << it->name
-                << " type "         << optionTypeName[it->type];
 
-      if (it->type == BUTTON)
+Option::operator int() const {
-          continue;
+  assert(type == "check" || type == "spin");
-
+  return (type == "spin" ? atoi(currentValue.c_str()) : currentValue == "true");
-      if (it->type == CHECK)
-          std::cout << " default " << (it->defaultValue == "1" ? "true" : "false");
-      else
-          std::cout << " default " << it->defaultValue;
-
-      if (it->type == SPIN)
-          std::cout << " min " << it->minValue
-                    << " max " << it->maxValue;
-
-      else if (it->type == COMBO)
-          for (ComboValues::const_iterator itc = it->comboValues.begin();
-              itc != it->comboValues.end(); ++itc)
-              std::cout << " var " << *itc;
 }
-  std::cout << std::endl;
+
+Option::operator std::string() const {
+  assert(type == "string");
+  return currentValue;
 }
 
 
-/// get_option_value_bool() returns the current value of a UCI parameter of
+/// operator=() updates currentValue and triggers on_change() action. It's up to
-/// type "check".
+/// the GUI to check for option's limits, but we could receive the new value from
+/// the user by console window, so let's check the bounds anyway.
 
-bool get_option_value_bool(const std::string& optionName) {
+Option& Option::operator=(const string& v) {
 
-  return get_option_value<bool>(optionName);
+  assert(!type.empty());
+
+  if (   (type != "button" && v.empty())
+      || (type == "check" && v != "true" && v != "false")
+      || (type == "spin" && (atoi(v.c_str()) < min || atoi(v.c_str()) > max)))
+      return *this;
+
+  if (type != "button")
+      currentValue = v;
+
+  if (on_change)
+      (*on_change)(*this);
+
+  return *this;
 }
 
-
+} // namespace UCI
-/// get_option_value_int() returns the value of a UCI parameter as an integer.
-/// Normally, this function will be used for a parameter of type "spin", but
-/// it could also be used with a "combo" parameter, where all the available
-/// values are integers.
-
-int get_option_value_int(const std::string& optionName) {
-
-  return get_option_value<int>(optionName);
-}
-
-
-/// get_option_value_string() returns the current value of a UCI parameter as
-/// a string. It is used with parameters of type "combo" and "string".
-
-const std::string get_option_value_string(const std::string& optionName) {
-
-   return get_option_value<std::string>(optionName);
-}
-
-
-/// set_option_value() inserts a new value for a UCI parameter. Note that
-/// the function does not check that the new value is legal for the given
-/// parameter: This is assumed to be the responsibility of the GUI.
-
-void set_option_value(const std::string& optionName,
-                      const std::string& newValue) {
-
-  // UCI protocol uses "true" and "false" instead of "1" and "0", so convert
-  // newValue according to standard C++ convention before to store it.
-  std::string v(newValue);
-  if (v == "true")
-      v = "1";
-  else if (v == "false")
-      v = "0";
-
-  if (options.find(optionName) != options.end())
-      options[optionName].currentValue = v;
-  else
-      std::cout << "No such option: " << optionName << std::endl;
-}
-
-
-/// push_button() is used to tell the engine that a UCI parameter of type
-/// "button" has been selected:
-
-void push_button(const std::string& buttonName) {
-
-  set_option_value(buttonName, "true");
-}
-
-
-/// button_was_pressed() tests whether a UCI parameter of type "button" has
-/// been selected since the last time the function was called, in this case
-/// it also resets the button.
-
-bool button_was_pressed(const std::string& buttonName) {
-
-  if (!get_option_value<bool>(buttonName))
-	  return false;
-
-  set_option_value(buttonName, "false");
-  return true;
-}
-
-
-namespace {
-
-  // Define constructors of Option class.
-
-  Option::Option() {} // To allow insertion in a std::map
-
-  Option::Option(const char* def, OptionType t)
-  : defaultValue(def), currentValue(def), type(t), idx(options.size()), minValue(0), maxValue(0) {}
-
-  Option::Option(bool def, OptionType t)
-  : defaultValue(stringify(def)), currentValue(stringify(def)), type(t), idx(options.size()), minValue(0), maxValue(0) {}
-
-  Option::Option(int def, int minv, int maxv)
-  : defaultValue(stringify(def)), currentValue(stringify(def)), type(SPIN), idx(options.size()), minValue(minv), maxValue(maxv) {}
-
-}

src/ucioption.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,37 +17,53 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(UCIOPTION_H_INCLUDED)
 #define UCIOPTION_H_INCLUDED
 
-////
+#include <map>
-//// Includes
-////
-
 #include <string>
 
+namespace UCI {
 
-////
+class Option;
-//// Variables
-////
 
-extern bool Chess960;
+/// Custom comparator because UCI options should be case insensitive
+struct CaseInsensitiveLess {
+  bool operator() (const std::string&, const std::string&) const;
+};
 
+/// Our options container is actually a std::map
+typedef std::map<std::string, Option, CaseInsensitiveLess> OptionsMap;
 
-////
+/// Option class implements an option as defined by UCI protocol
-//// Prototypes
+class Option {
-////
 
-extern void init_uci_options();
+  typedef void (Fn)(const Option&);
-extern void print_uci_options();
-extern bool get_option_value_bool(const std::string &optionName);
-extern int get_option_value_int(const std::string &optionName);
-extern const std::string get_option_value_string(const std::string &optionName);
-extern bool button_was_pressed(const std::string &buttonName);
-extern void set_option_value(const std::string &optionName,
-                             const std::string &newValue);
-extern void push_button(const std::string &buttonName);
 
+public:
+  Option(Fn* = NULL);
+  Option(bool v, Fn* = NULL);
+  Option(const char* v, Fn* = NULL);
+  Option(int v, int min, int max, Fn* = NULL);
+
+  Option& operator=(const std::string& v);
+  operator int() const;
+  operator std::string() const;
+
+private:
+  friend std::ostream& operator<<(std::ostream&, const OptionsMap&);
+
+  std::string defaultValue, currentValue, type;
+  int min, max;
+  size_t idx;
+  Fn* on_change;
+};
+
+void init(OptionsMap&);
+void loop(const std::string&);
+
+} // namespace UCI
+
+extern UCI::OptionsMap Options;
 
 #endif // !defined(UCIOPTION_H_INCLUDED)

src/value.cpp

@@ -1,96 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-////
-//// Includes
-////
-
-#include <sstream>
-#include <string>
-
-#include "value.h"
-
-
-////
-//// Functions
-////
-
-/// value_to_tt() adjusts a mate score from "plies to mate from the root" to
-/// "plies to mate from the current ply".  Non-mate scores are unchanged.
-/// The function is called before storing a value to the transposition table.
-
-Value value_to_tt(Value v, int ply) {
-  if(v >= value_mate_in(100))
-    return v + ply;
-  else if(v <= value_mated_in(100))
-    return v - ply;
-  else
-    return v;
-}
-
-
-/// value_from_tt() is the inverse of value_to_tt():  It adjusts a mate score
-/// from the transposition table to a mate score corrected for the current
-/// ply depth.
-
-Value value_from_tt(Value v, int ply) {
-  if(v >= value_mate_in(100))
-    return v - ply;
-  else if(v <= value_mated_in(100))
-    return v + ply;
-  else
-    return v;
-}
-
-
-/// value_to_centipawns() converts a value from Stockfish's somewhat unusual
-/// scale of pawn = 256 to the more conventional pawn = 100.
-
-int value_to_centipawns(Value v) {
-  return (int(v) * 100) / int(PawnValueMidgame);
-}
-
-
-/// value_from_centipawns() converts a centipawn value to Stockfish's internal
-/// evaluation scale.  It's used when reading the values of UCI options
-/// containing material values (e.g. futility pruning margins).
-
-Value value_from_centipawns(int cp) {
-  return Value((cp * 256) / 100);
-}
-
-
-/// value_to_string() converts a value to a string suitable for use with the
-/// UCI protocol.
-
-const std::string value_to_string(Value v) {
-  std::stringstream s;
-
-  if(abs(v) < VALUE_MATE - 200)
-    s << "cp " << value_to_centipawns(v);
-  else {
-    s << "mate ";
-    if(v > 0)
-      s << (VALUE_MATE - v + 1) / 2;
-    else
-      s << -(VALUE_MATE + v) / 2;
-  }
-  return s.str();
-}

src/value.h

@@ -1,168 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(VALUE_H_INCLUDED)
-#define VALUE_H_INCLUDED
-
-////
-//// Includes
-////
-
-#include "piece.h"
-
-
-////
-//// Types
-////
-
-enum ValueType {
-  VALUE_TYPE_NONE = 0,
-  VALUE_TYPE_UPPER = 1,  // Upper bound
-  VALUE_TYPE_LOWER = 2,  // Lower bound
-  VALUE_TYPE_EXACT = 3,  // Exact score
-  VALUE_TYPE_EVAL  = 4   // Evaluation cache
-};
-
-
-enum Value {
-  VALUE_DRAW = 0,
-  VALUE_KNOWN_WIN = 15000,
-  VALUE_MATE = 30000,
-  VALUE_INFINITE = 30001,
-  VALUE_NONE = 30002
-};
-
-
-////
-//// Constants and variables
-////
-
-/// Piece values, middle game and endgame
-
-/// Important: If the material values are changed, one must also
-/// adjust the piece square tables, and the method game_phase() in the
-/// Position class!
-///
-/// Values modified by Joona Kiiski
-
-const Value PawnValueMidgame   = Value(0x0CC);
-const Value PawnValueEndgame   = Value(0x101);
-const Value KnightValueMidgame = Value(0x332);
-const Value KnightValueEndgame = Value(0x34E);
-const Value BishopValueMidgame = Value(0x345);
-const Value BishopValueEndgame = Value(0x356);
-const Value RookValueMidgame   = Value(0x4F8);
-const Value RookValueEndgame   = Value(0x500);
-const Value QueenValueMidgame  = Value(0x9D5);
-const Value QueenValueEndgame  = Value(0x9FB);
-
-const Value PieceValueMidgame[17] = {
-  Value(0),
-  PawnValueMidgame, KnightValueMidgame, BishopValueMidgame,
-  RookValueMidgame, QueenValueMidgame,
-  Value(0), Value(0), Value(0),
-  PawnValueMidgame, KnightValueMidgame, BishopValueMidgame,
-  RookValueMidgame, QueenValueMidgame,
-  Value(0), Value(0), Value(0)
-};
-
-const Value PieceValueEndgame[17] = {
-  Value(0),
-  PawnValueEndgame, KnightValueEndgame, BishopValueEndgame,
-  RookValueEndgame, QueenValueEndgame,
-  Value(0), Value(0), Value(0),
-  PawnValueEndgame, KnightValueEndgame, BishopValueEndgame,
-  RookValueEndgame, QueenValueEndgame,
-  Value(0), Value(0), Value(0)
-};
-
-/// Bonus for having the side to move
-
-const Value TempoValueMidgame = Value(48);
-const Value TempoValueEndgame = Value(21);
-
-
-////
-//// Inline functions
-////
-
-inline Value operator+ (Value v, int i) { return Value(int(v) + i); }
-inline Value operator+ (Value v1, Value v2) { return Value(int(v1) + int(v2)); }
-inline void operator+= (Value &v1, Value v2) {
-  v1 = Value(int(v1) + int(v2));
-}
-inline Value operator- (Value v, int i) { return Value(int(v) - i); }
-inline Value operator- (Value v) { return Value(-int(v)); }
-inline Value operator- (Value v1, Value v2) { return Value(int(v1) - int(v2)); }
-inline void operator-= (Value &v1, Value v2) {
-  v1 = Value(int(v1) - int(v2));
-}
-inline Value operator* (Value v, int i) { return Value(int(v) * i); }
-inline void operator*= (Value &v, int i) { v = Value(int(v) * i); }
-inline Value operator* (int i, Value v) { return Value(int(v) * i); }
-inline Value operator/ (Value v, int i) { return Value(int(v) / i); }
-inline void operator/= (Value &v, int i) { v = Value(int(v) / i); }
-
-
-inline Value value_mate_in(int ply) {
-  return Value(VALUE_MATE - Value(ply));
-}
-
-inline Value value_mated_in(int ply) {
-  return Value(-VALUE_MATE + Value(ply));
-}
-
-inline bool is_upper_bound(ValueType vt) {
-  return (int(vt) & int(VALUE_TYPE_UPPER)) != 0;
-}
-
-inline bool is_lower_bound(ValueType vt) {
-  return (int(vt) & int(VALUE_TYPE_LOWER)) != 0;
-}
-
-inline Value piece_value_midgame(PieceType pt) {
-  return PieceValueMidgame[pt];
-}
-
-inline Value piece_value_endgame(PieceType pt) {
-  return PieceValueEndgame[pt];
-}
-
-inline Value piece_value_midgame(Piece p) {
-  return PieceValueMidgame[p];
-}
-
-inline Value piece_value_endgame(Piece p) {
-  return PieceValueEndgame[p];
-}
-
-
-////
-//// Prototypes
-////
-
-extern Value value_to_tt(Value v, int ply);
-extern Value value_from_tt(Value v, int ply);
-extern int value_to_centipawns(Value v);
-extern Value value_from_centipawns(int cp);
-extern const std::string value_to_string(Value v);
-
-
-#endif // !defined(VALUE_H_INCLUDED)