79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
/*
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2021 The Stockfish developers (see AUTHORS file)
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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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#ifndef TBPROBE_H
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#define TBPROBE_H
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#include <ostream>
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#include "../search.h"
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namespace Stockfish::Tablebases {
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enum WDLScore {
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WDLLoss = -2, // Loss
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WDLBlessedLoss = -1, // Loss, but draw under 50-move rule
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WDLDraw = 0, // Draw
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WDLCursedWin = 1, // Win, but draw under 50-move rule
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WDLWin = 2, // Win
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WDLScoreNone = -1000
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};
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// Possible states after a probing operation
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enum ProbeState {
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FAIL = 0, // Probe failed (missing file table)
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OK = 1, // Probe succesful
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CHANGE_STM = -1, // DTZ should check the other side
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ZEROING_BEST_MOVE = 2 // Best move zeroes DTZ (capture or pawn move)
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};
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extern int MaxCardinality;
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void init(const std::string& paths);
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WDLScore probe_wdl(Position& pos, ProbeState* result);
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int probe_dtz(Position& pos, ProbeState* result);
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bool root_probe(Position& pos, Search::RootMoves& rootMoves);
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bool root_probe_wdl(Position& pos, Search::RootMoves& rootMoves);
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void rank_root_moves(Position& pos, Search::RootMoves& rootMoves);
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inline std::ostream& operator<<(std::ostream& os, const WDLScore v) {
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os << (v == WDLLoss ? "Loss" :
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v == WDLBlessedLoss ? "Blessed loss" :
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v == WDLDraw ? "Draw" :
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v == WDLCursedWin ? "Cursed win" :
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v == WDLWin ? "Win" : "None");
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return os;
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}
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inline std::ostream& operator<<(std::ostream& os, const ProbeState v) {
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os << (v == FAIL ? "Failed" :
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v == OK ? "Success" :
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v == CHANGE_STM ? "Probed opponent side" :
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v == ZEROING_BEST_MOVE ? "Best move zeroes DTZ" : "None");
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return os;
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}
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} // namespace Stockfish::Tablebases
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#endif
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