Jerry Donald Watson 348cd5ed74 Simple razoring: depth 1 only, no distinction between PV / NonPV ...

We simplify the razoring logic by applying it to all nodes at depth 1 only.
An added advantage is that only one razor margin is needed now, and we treat
PV and Non-PV nodes in the same manner.

How to continue?
- There may be some conditions in which depth 2 razoring is beneficial.
- We can see whether the razor margin can be tuned, perhaps even with a
  different value for PV nodes.
- Perhaps we can unify the treatment of PV and Non-PV nodes in other parts
  of the search as well.

STC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 5474 W: 1281 L: 1127 D: 3066
http://tests.stockfishchess.org/tests/view/5b6de3b20ebc5902bdba0d1e

LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 62670 W: 10749 L: 10697 D: 41224
http://tests.stockfishchess.org/tests/view/5b6dee340ebc5902bdba0eb0

In addition, we ran a fixed LTC test against a similar patch which also
passed SPRT [-3, 1]:

ELO: 0.23 +-2.1 (95%) LOS: 58.6%
Total: 36412 W: 6168 L: 6144 D: 24100
http://tests.stockfishchess.org/tests/view/5b6e83940ebc5902bdba1485

We are opting for this patch as the more logical and simple of the two,
and it appears to be no less strong. Thanks in particular to @DU-jdto
for input into this patch.

Bench: 4476945

2018-08-12 09:54:16 +02:00

..

syzygy

7-pieces Syzygy tablebase support

2018-07-31 11:24:28 +02:00

benchmark.cpp

New Year 2018

2018-01-01 13:18:10 +01:00

bitbase.cpp

Mark all compile-time constants as constexpr.

2018-03-18 23:48:16 +01:00

bitboard.cpp

Minor code style tweaks

2018-07-18 08:26:33 +02:00

bitboard.h

Remove make_bitboard()

2018-06-26 09:08:15 +02:00

endgame.cpp

Slight tidy up in endgame machinery

2018-07-22 17:55:41 +02:00

endgame.h

Slight tidy up in endgame machinery

2018-07-22 17:55:41 +02:00

evaluate.cpp

First check threshold in space evaluation

2018-08-08 17:58:41 +02:00

evaluate.h

Slight tidy up in endgame machinery

2018-07-22 17:55:41 +02:00

main.cpp

Reallocate TT on threadpool resize.

2018-06-02 17:03:01 +02:00

Makefile

Fix 'make strip' for mingw.

2018-04-29 06:53:51 +02:00

material.cpp

Slight tidy up in endgame machinery

2018-07-22 17:55:41 +02:00

material.h

Slight tidy up in endgame machinery

2018-07-22 17:55:41 +02:00

misc.cpp

Code clean-up

2018-07-25 18:31:02 +02:00

misc.h

Switch time management to 64 bits

2018-03-27 16:25:41 +02:00

movegen.cpp

Fix a few minor code style inconsistencies

2018-03-21 01:35:05 +01:00

movegen.h

New Year 2018

2018-01-01 13:18:10 +01:00

movepick.cpp

Better check evasion move sorting

2018-07-19 18:27:20 +02:00

movepick.h

Improve Stats definition

2018-08-01 12:40:12 +02:00

pawns.cpp

Remove Condition For Passed Pawns

2018-08-10 06:16:29 +02:00

pawns.h

Simplify the ShelterStrength[] array

2018-04-23 09:49:05 +02:00

position.cpp

Allow Position::init() to be called multiple times.

2018-07-18 08:14:57 +02:00

position.h

Move PSQ score to Position

2018-06-27 11:42:25 +02:00

psqt.cpp

King Psqt Tuning

2018-08-08 17:49:16 +02:00

search.cpp

Simple razoring: depth 1 only, no distinction between PV / NonPV

2018-08-12 09:54:16 +02:00

search.h

Better check evasion move sorting

2018-07-19 18:27:20 +02:00

thread_win32.h

New Year 2018

2018-01-01 13:18:10 +01:00

thread.cpp

Improve Stats definition

2018-08-01 12:40:12 +02:00

thread.h

Better check evasion move sorting

2018-07-19 18:27:20 +02:00

timeman.cpp

Switch time management to 64 bits

2018-03-27 16:25:41 +02:00

timeman.h

Document Elo impact of various parts of search

2018-04-01 03:21:45 +02:00

tt.cpp

Simplify saving a TT entry.

2018-07-04 00:59:15 +02:00

tt.h

Simplify saving a TT entry.

2018-07-04 00:59:15 +02:00

types.h

Minor code style tweaks

2018-07-18 08:26:33 +02:00

uci.cpp

Fix a few minor code style inconsistencies

2018-03-21 01:35:05 +01:00

uci.h

Minor code style tweaks

2018-07-18 08:26:33 +02:00

ucioption.cpp

7-pieces Syzygy tablebase support

2018-07-31 11:24:28 +02:00