mirror of
https://github.com/opelly27/Stockfish.git
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Marco Costalba
3c07603dac
Import C++11 branch from: https://github.com/mcostalba/Stockfish/tree/c++11 The version imported is teh last one as of today: https://github.com/mcostalba/Stockfish/commit/6670e93e50a7a4e739ac2ac8b6026ffa3a12150a Branch is fully equivalent with master but syzygy tablebases that are missing (but will be added with next commit). bench: 8080602
121 lines
3.2 KiB
C++
121 lines
3.2 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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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 ENDGAME_H_INCLUDED
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#define ENDGAME_H_INCLUDED
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#include <map>
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#include <memory>
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#include <string>
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#include <type_traits>
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#include <utility>
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#include "position.h"
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#include "types.h"
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/// EndgameType lists all supported endgames
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enum EndgameType {
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// Evaluation functions
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KNNK, // KNN vs K
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KXK, // Generic "mate lone king" eval
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KBNK, // KBN vs K
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KPK, // KP vs K
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KRKP, // KR vs KP
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KRKB, // KR vs KB
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KRKN, // KR vs KN
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KQKP, // KQ vs KP
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KQKR, // KQ vs KR
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// Scaling functions
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SCALING_FUNCTIONS,
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KBPsK, // KB and pawns vs K
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KQKRPs, // KQ vs KR and pawns
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KRPKR, // KRP vs KR
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KRPKB, // KRP vs KB
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KRPPKRP, // KRPP vs KRP
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KPsK, // K and pawns vs K
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KBPKB, // KBP vs KB
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KBPPKB, // KBPP vs KB
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KBPKN, // KBP vs KN
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KNPK, // KNP vs K
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KNPKB, // KNP vs KB
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KPKP // KP vs KP
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};
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/// Endgame functions can be of two types depending on whether they return a
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/// Value or a ScaleFactor.
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template<EndgameType E>
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using eg_fun = std::conditional<(E < SCALING_FUNCTIONS), Value, ScaleFactor>;
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/// Base and derived templates for endgame evaluation and scaling functions
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template<typename T>
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struct EndgameBase {
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virtual ~EndgameBase() {}
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virtual Color strong_side() const = 0;
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virtual T operator()(const Position&) const = 0;
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};
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template<EndgameType E, typename T = typename eg_fun<E>::type>
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struct Endgame : public EndgameBase<T> {
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explicit Endgame(Color c) : strongSide(c), weakSide(~c) {}
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Color strong_side() const { return strongSide; }
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T operator()(const Position&) const;
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private:
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const Color strongSide, weakSide;
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};
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/// The Endgames class stores the pointers to endgame evaluation and scaling
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/// base objects in two std::map. We use polymorphism to invoke the actual
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/// endgame function by calling its virtual operator().
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class Endgames {
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template<typename T> using Map = std::map<Key, std::unique_ptr<T>>;
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template<EndgameType E, typename T = EndgameBase<typename eg_fun<E>::type>>
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void add(const std::string& code);
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template<typename T, int I = std::is_same<T, EndgameBase<ScaleFactor>>::value>
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Map<T>& map() { return std::get<I>(maps); }
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std::pair<Map<EndgameBase<Value>>, Map<EndgameBase<ScaleFactor>>> maps;
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public:
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Endgames();
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template<typename T> T* probe(Key key, T** eg)
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{ return *eg = map<T>().count(key) ? map<T>()[key].get() : nullptr; }
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};
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#endif // #ifndef ENDGAME_H_INCLUDED
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