WebSVN – Games.Chess Giants – Blame – //engine-texel/tbprobe.hpp

Rev	Author	Line No.	Line
99	pmbaty	1	/*
		2	Texel - A UCI chess engine.
		3	Copyright (C) 2014 Peter Österlund, peterosterlund2@gmail.com
		4
		5	This program is free software: you can redistribute it and/or modify
		6	it under the terms of the GNU General Public License as published by
		7	the Free Software Foundation, either version 3 of the License, or
		8	(at your option) any later version.
		9
		10	This program is distributed in the hope that it will be useful,
		11	but WITHOUT ANY WARRANTY; without even the implied warranty of
		12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		13	GNU General Public License for more details.
		14
		15	You should have received a copy of the GNU General Public License
		16	along with this program. If not, see <http://www.gnu.org/licenses/>.
		17	*/
		18
		19	/*
		20	* tbprobe.hpp
		21	*
		22	* Created on: Jun 2, 2014
		23	* Author: petero
		24	*/
		25
		26	#ifndef TBPROBE_HPP_
		27	#define TBPROBE_HPP_
		28
		29	#include "transpositionTable.hpp"
		30	#include "moveGen.hpp"
		31
		32	#include <string>
		33
		34
		35	class Position;
		36
		37	/**
		38	* Handle tablebase probing.
		39	*/
		40	class TBProbe {
		41	friend class TBTest;
		42	public:
		43	/** Initialize tablebases. */
		44	static void initialize(const std::string& gtbPath, int cacheMB,
		45	const std::string& rtbPath);
		46
		47	/** Return true if GTB or RTB probing is enabled. */
		48	static bool tbEnabled();
		49
		50	/** Probe one or more tablebases to get an exact score or a usable bound.
		51	* @param pos The position to probe. The position can be temporarily modified
		52	* but is restored to original state before function returns.
		53	*/
		54	static bool tbProbe(Position& pos, int ply, int alpha, int beta,
		55	TranspositionTable::TTEntry& ent);
		56
		57	/** If some TB files are missing, it may be necessary to only search a subset
		58	* of the root moves in order to make progress. This might happen for example
		59	* in KPK if the KQK table is missing and search is not able to see the mate
		60	* after promoting the pawn.
		61	* @param pos The root position.
		62	* @param legalMoves The set of legal root moves.
		63	* @param movesToSearch The moves to search.
		64	* @return True if a subset should be searched, false to search all moves.
		65	*/
		66	static bool getSearchMoves(Position& pos, const MoveList& legalMoves,
		67	std::vector<Move>& movesToSearch);
		68
		69	/** Enhance PV with DTM information from gaviota tablebases. */
		70	static void extendPV(const Position& rootPos, std::vector<Move>& pv);
		71
		72	/** Probe gaviota DTM tablebases.
		73	* @param pos The position to probe. The position can be temporarily modified
		74	* but is restored to original state before function returns.
		75	* @param ply The ply value used to adjust mate scores.
		76	* @param score The tablebase score. Only modified for tablebase hits.
		77	* @return True if pos was found in the tablebases.
		78	*/
		79	static bool gtbProbeDTM(Position& pos, int ply, int& score);
		80
		81	/**
		82	* Probe gaviota WDL tablebases.
		83	* @param pos The position to probe. The position can be temporarily modified
		84	* but is restored to original state before function returns.
		85	* @param ply The ply value used to adjust mate scores.
		86	* @param score The tablebase score. Only modified for tablebase hits.
		87	* The returned score is either 0 or a mate bound.
		88	*/
		89	static bool gtbProbeWDL(Position& pos, int ply, int& score);
		90
		91	/**
		92	* Probe syzygy DTZ tablebases.
		93	* @param pos The position to probe. The position can be temporarily modified
		94	* but is restored to original state before function returns.
		95	* @param ply The ply value used to adjust mate scores.
		96	* @param score The tablebase score. Only modified for tablebase hits.
		97	* The returned score is either 0 or a mate bound. The bound
		98	* is computed by considering the DTZ value and the maximum number
		99	* of zeroing moves before mate.
		100	*/
		101	static bool rtbProbeDTZ(Position& pos, int ply, int& score);
		102
		103	/**
		104	* Probe syzygy WDL tablebases.
		105	* @param pos The position to probe. The position can be temporarily modified
		106	* but is restored to original state before function returns.
		107	* @param ply The ply value used to adjust mate scores.
		108	* @param score The tablebase score. Only modified for tablebase hits.
		109	* The returned score is either 0 or a mate bound.
		110	*/
		111	static bool rtbProbeWDL(Position& pos, int ply, int& score);
		112
		113	private:
		114	/** Initialize */
		115	static void gtbInitialize(const std::string& path, int cacheMB, int wdlFraction);
		116
		117	static void initWDLBounds();
		118	static int getMaxDTZ(int matId);
		119	static int getMaxSubMate(const Position& pos);
		120	static int getMaxSubMate(std::vector<int>& pieces, int pawnMoves);
		121	static void initMaxDTM();
		122	static void initMaxDTZ();
		123
		124	struct GtbProbeData {
		125	unsigned int stm, epsq, castles;
		126	static const int MAXLEN = 17;
		127	unsigned int wSq[MAXLEN];
		128	unsigned int bSq[MAXLEN];
		129	unsigned char wP[MAXLEN];
		130	unsigned char bP[MAXLEN];
		131	int materialId;
		132	};
		133
		134	/** Convert position to GTB probe format. */
		135	static void getGTBProbeData(const Position& pos, GtbProbeData& gtbData);
		136
		137	static bool gtbProbeDTM(const GtbProbeData& gtbData, int ply, int& score);
		138
		139	static bool gtbProbeWDL(const GtbProbeData& gtbData, int ply, int& score);
		140	};
		141
		142
		143	#endif /* TBPROBE_HPP_ */

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Games.Chess Giants//engine-texel/tbprobe.hpp – Rev 99