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https://github.com/opelly27/Stockfish.git
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Marco Costalba
6413d9b1f9
This patch adds some documentation and code cleanup to tablebase code. It took me some time to understand the relation among the differrent structs, although I have rewrote them fully in the past. So I wrote some detailed documentation to avoid the same efforts for future readers. Also noteworthy is the use a standard hash table implementation with a more efficient 1D array instead of a 2D array. This reduces the average lookup steps of 90% (from 343 to 38 in a bench 128 1 16 run) and reduces also the table from 5K to 4K entries. I have tested on 5-men and no functional and no slowdown reported. It should be verified on 6-men that the new hash does not overflow. It is enough to run ./stockfish with 6-men available: if it does not assert at startup it means everything is ok with 6-men too. EDIT: verified for 6-men tablebase by Jörg Oster. Thanks! No functional change.
56 lines
1.5 KiB
C++
56 lines
1.5 KiB
C++
/*
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
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Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
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Copyright (C) 2015-2018 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
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Stockfish is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Stockfish is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <iostream>
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#include "bitboard.h"
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#include "position.h"
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#include "search.h"
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#include "thread.h"
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#include "tt.h"
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#include "uci.h"
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#include "syzygy/tbprobe.h"
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namespace PSQT {
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void init();
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}
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int main(int argc, char* argv[]) {
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std::cout << engine_info() << std::endl;
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UCI::init(Options);
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PSQT::init();
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Bitboards::init();
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Position::init();
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Bitbases::init();
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Search::init();
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Pawns::init();
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Tablebases::init(Options["SyzygyPath"]); // After Bitboards are set
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TT.resize(Options["Hash"]);
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Threads.set(Options["Threads"]);
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Search::clear(); // After threads are up
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UCI::loop(argc, argv);
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Threads.set(0);
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return 0;
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}
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