X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fmaterial.cpp;h=8a13d11559737ce36f3e6d88125e607131c55b7e;hp=3b1ead6dafcd22ed40706b666819e8ad3441d23c;hb=bbd3e30b4e297877f1e1cad3e5b942175c58290b;hpb=5e906ea10e100cdad2f65d49e8212c14a1d65050 diff --git a/src/material.cpp b/src/material.cpp index 3b1ead6d..8a13d115 100644 --- a/src/material.cpp +++ b/src/material.cpp @@ -1,7 +1,7 @@ /* Stockfish, a UCI chess playing engine derived from Glaurung 2.1 Copyright (C) 2004-2008 Tord Romstad (Glaurung author) - Copyright (C) 2008 Marco Costalba + Copyright (C) 2008-2009 Marco Costalba Stockfish is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -23,10 +23,13 @@ //// #include +#include +#include #include #include "material.h" +using std::string; //// //// Local definitions @@ -34,80 +37,48 @@ namespace { - const Value BishopPairMidgameBonus = Value(100); - const Value BishopPairEndgameBonus = Value(100); + // Values modified by Joona Kiiski + const Value BishopPairMidgameBonus = Value(109); + const Value BishopPairEndgameBonus = Value(97); Key KNNKMaterialKey, KKNNMaterialKey; - struct ScalingInfo - { - Color col; - ScalingFunction* fun; - }; - - std::map EEFmap; - std::map ESFmap; - - void add(Key k, EndgameEvaluationFunction* f) { - - EEFmap.insert(std::pair(k, f)); - } - - void add(Key k, Color c, ScalingFunction* f) { - - ScalingInfo s = {c, f}; - ESFmap.insert(std::pair(k, s)); - } - } - //// -//// Functions +//// Classes //// -/// MaterialInfo::init() is called during program initialization. It -/// precomputes material hash keys for a few basic endgames, in order -/// to make it easy to recognize such endgames when they occur. -void MaterialInfo::init() { +/// See header for a class description. It is declared here to avoid +/// to include in the header file. - typedef Key ZM[2][8][16]; - const ZM& z = Position::zobMaterial; +class EndgameFunctions { - static const Color W = WHITE; - static const Color B = BLACK; +public: + EndgameFunctions(); + EndgameEvaluationFunctionBase* getEEF(Key key) const; + EndgameScalingFunctionBase* getESF(Key key, Color* c) const; - KNNKMaterialKey = z[W][KNIGHT][1] ^ z[W][KNIGHT][2]; - KKNNMaterialKey = z[B][KNIGHT][1] ^ z[B][KNIGHT][2]; +private: + void add(const string& keyCode, EndgameEvaluationFunctionBase* f); + void add(const string& keyCode, Color c, EndgameScalingFunctionBase* f); + Key buildKey(const string& keyCode); - add(z[W][PAWN][1], &EvaluateKPK); - add(z[B][PAWN][1], &EvaluateKKP); - - add(z[W][BISHOP][1] ^ z[W][KNIGHT][1], &EvaluateKBNK); - add(z[B][BISHOP][1] ^ z[B][KNIGHT][1], &EvaluateKKBN); - add(z[W][ROOK][1] ^ z[B][PAWN][1], &EvaluateKRKP); - add(z[W][PAWN][1] ^ z[B][ROOK][1], &EvaluateKPKR); - add(z[W][ROOK][1] ^ z[B][BISHOP][1], &EvaluateKRKB); - add(z[W][BISHOP][1] ^ z[B][ROOK][1], &EvaluateKBKR); - add(z[W][ROOK][1] ^ z[B][KNIGHT][1], &EvaluateKRKN); - add(z[W][KNIGHT][1] ^ z[B][ROOK][1], &EvaluateKNKR); - add(z[W][QUEEN][1] ^ z[B][ROOK][1], &EvaluateKQKR); - add(z[W][ROOK][1] ^ z[B][QUEEN][1], &EvaluateKRKQ); + struct ScalingInfo + { + Color col; + EndgameScalingFunctionBase* fun; + }; - add(z[W][KNIGHT][1] ^ z[W][PAWN][1], W, &ScaleKNPK); - add(z[B][KNIGHT][1] ^ z[B][PAWN][1], B, &ScaleKKNP); + std::map EEFmap; + std::map ESFmap; +}; - add(z[W][ROOK][1] ^ z[W][PAWN][1] ^ z[B][ROOK][1] , W, &ScaleKRPKR); - add(z[W][ROOK][1] ^ z[B][ROOK][1] ^ z[B][PAWN][1] , B, &ScaleKRKRP); - add(z[W][BISHOP][1] ^ z[W][PAWN][1] ^ z[B][BISHOP][1], W, &ScaleKBPKB); - add(z[W][BISHOP][1] ^ z[B][BISHOP][1] ^ z[B][PAWN][1] , B, &ScaleKBKBP); - add(z[W][BISHOP][1] ^ z[W][PAWN][1] ^ z[B][KNIGHT][1], W, &ScaleKBPKN); - add(z[W][KNIGHT][1] ^ z[B][BISHOP][1] ^ z[B][PAWN][1] , B, &ScaleKNKBP); - add(z[W][ROOK][1] ^ z[W][PAWN][1] ^ z[W][PAWN][2] ^ z[B][ROOK][1] ^ z[B][PAWN][1], W, &ScaleKRPPKRP); - add(z[W][ROOK][1] ^ z[W][PAWN][1] ^ z[B][ROOK][1] ^ z[B][PAWN][1] ^ z[B][PAWN][2], B, &ScaleKRPKRPP); -} +//// +//// Functions +//// /// Constructor for the MaterialInfoTable class @@ -116,11 +87,12 @@ MaterialInfoTable::MaterialInfoTable(unsigned int numOfEntries) { size = numOfEntries; entries = new MaterialInfo[size]; - if (!entries) + funcs = new EndgameFunctions(); + if (!entries || !funcs) { std::cerr << "Failed to allocate " << (numOfEntries * sizeof(MaterialInfo)) << " bytes for material hash table." << std::endl; - exit(EXIT_FAILURE); + Application::exit_with_failure(); } clear(); } @@ -131,6 +103,7 @@ MaterialInfoTable::MaterialInfoTable(unsigned int numOfEntries) { MaterialInfoTable::~MaterialInfoTable() { delete [] entries; + delete funcs; } @@ -149,7 +122,7 @@ void MaterialInfoTable::clear() { /// is stored there, so we don't have to recompute everything when the /// same material configuration occurs again. -MaterialInfo *MaterialInfoTable::get_material_info(const Position& pos) { +MaterialInfo* MaterialInfoTable::get_material_info(const Position& pos) { Key key = pos.get_material_key(); int index = key & (size - 1); @@ -157,29 +130,28 @@ MaterialInfo *MaterialInfoTable::get_material_info(const Position& pos) { // If mi->key matches the position's material hash key, it means that we // have analysed this material configuration before, and we can simply - // return the information we found the last time instead of recomputing it: - if(mi->key == key) - return mi; + // return the information we found the last time instead of recomputing it. + if (mi->key == key) + return mi; - // Clear the MaterialInfo object, and set its key: + // Clear the MaterialInfo object, and set its key mi->clear(); mi->key = key; // A special case before looking for a specialized evaluation function - // KNN vs K is a draw + // KNN vs K is a draw. if (key == KNNKMaterialKey || key == KKNNMaterialKey) { - mi->factor[WHITE] = mi->factor[BLACK] = 0; - return mi; + mi->factor[WHITE] = mi->factor[BLACK] = 0; + return mi; } // Let's look if we have a specialized evaluation function for this - // particular material configuration - if (EEFmap.find(key) != EEFmap.end()) - { - mi->evaluationFunction = EEFmap[key]; + // particular material configuration. First we look for a fixed + // configuration one, then a generic one if previous search failed. + if ((mi->evaluationFunction = funcs->getEEF(key)) != NULL) return mi; - } + else if ( pos.non_pawn_material(BLACK) == Value(0) && pos.piece_count(BLACK, PAWN) == 0 && pos.non_pawn_material(WHITE) >= RookValueEndgame) @@ -194,6 +166,22 @@ MaterialInfo *MaterialInfoTable::get_material_info(const Position& pos) { mi->evaluationFunction = &EvaluateKKX; return mi; } + else if ( pos.pawns() == EmptyBoardBB + && pos.rooks() == EmptyBoardBB + && pos.queens() == EmptyBoardBB) + { + // Minor piece endgame with at least one minor piece per side, + // and no pawns. + assert(pos.knights(WHITE) | pos.bishops(WHITE)); + assert(pos.knights(BLACK) | pos.bishops(BLACK)); + + if ( pos.piece_count(WHITE, BISHOP) + pos.piece_count(WHITE, KNIGHT) <= 2 + && pos.piece_count(BLACK, BISHOP) + pos.piece_count(BLACK, KNIGHT) <= 2) + { + mi->evaluationFunction = &EvaluateKmmKm; + return mi; + } + } // OK, we didn't find any special evaluation function for the current // material configuration. Is there a suitable scaling function? @@ -202,10 +190,12 @@ MaterialInfo *MaterialInfoTable::get_material_info(const Position& pos) { // if we decide to add more special cases. We face problems when there // are several conflicting applicable scaling functions and we need to // decide which one to use. + Color c; + EndgameScalingFunctionBase* sf; - if (ESFmap.find(key) != ESFmap.end()) + if ((sf = funcs->getESF(key, &c)) != NULL) { - mi->scalingFunction[ESFmap[key].col] = ESFmap[key].fun; + mi->scalingFunction[c] = sf; return mi; } @@ -252,9 +242,20 @@ MaterialInfo *MaterialInfoTable::get_material_info(const Position& pos) { } } + // Compute the space weight + if (pos.non_pawn_material(WHITE) + pos.non_pawn_material(BLACK) >= + 2*QueenValueMidgame + 4*RookValueMidgame + 2*KnightValueMidgame) + { + int minorPieceCount = pos.piece_count(WHITE, KNIGHT) + + pos.piece_count(BLACK, KNIGHT) + + pos.piece_count(WHITE, BISHOP) + + pos.piece_count(BLACK, BISHOP); + + mi->spaceWeight = minorPieceCount * minorPieceCount; + } + // Evaluate the material balance - Color c; int sign; Value egValue = Value(0); Value mgValue = Value(0); @@ -306,8 +307,97 @@ MaterialInfo *MaterialInfoTable::get_material_info(const Position& pos) { egValue -= sign * v; } } - mi->mgValue = int16_t(mgValue); mi->egValue = int16_t(egValue); return mi; } + + +/// EndgameFunctions member definitions. This class is used to store the maps +/// of end game and scaling functions that MaterialInfoTable will query for +/// each key. The maps are constant and are populated only at construction, +/// but are per-thread instead of globals to avoid expensive locks. + +EndgameFunctions::EndgameFunctions() { + + KNNKMaterialKey = buildKey("KNNK"); + KKNNMaterialKey = buildKey("KKNN"); + + add("KPK", &EvaluateKPK); + add("KKP", &EvaluateKKP); + add("KBNK", &EvaluateKBNK); + add("KKBN", &EvaluateKKBN); + add("KRKP", &EvaluateKRKP); + add("KPKR", &EvaluateKPKR); + add("KRKB", &EvaluateKRKB); + add("KBKR", &EvaluateKBKR); + add("KRKN", &EvaluateKRKN); + add("KNKR", &EvaluateKNKR); + add("KQKR", &EvaluateKQKR); + add("KRKQ", &EvaluateKRKQ); + add("KBBKN", &EvaluateKBBKN); + add("KNKBB", &EvaluateKNKBB); + + add("KNPK", WHITE, &ScaleKNPK); + add("KKNP", BLACK, &ScaleKKNP); + add("KRPKR", WHITE, &ScaleKRPKR); + add("KRKRP", BLACK, &ScaleKRKRP); + add("KBPKB", WHITE, &ScaleKBPKB); + add("KBKBP", BLACK, &ScaleKBKBP); + add("KBPPKB", WHITE, &ScaleKBPPKB); + add("KBKBPP", BLACK, &ScaleKBKBPP); + add("KBPKN", WHITE, &ScaleKBPKN); + add("KNKBP", BLACK, &ScaleKNKBP); + add("KRPPKRP", WHITE, &ScaleKRPPKRP); + add("KRPKRPP", BLACK, &ScaleKRPKRPP); + add("KRPPKRP", WHITE, &ScaleKRPPKRP); + add("KRPKRPP", BLACK, &ScaleKRPKRPP); +} + +Key EndgameFunctions::buildKey(const string& keyCode) { + + assert(keyCode.length() > 0 && keyCode[0] == 'K'); + assert(keyCode.length() < 8); + + std::stringstream s; + bool upcase = false; + + // Build up a fen substring with the given pieces, note + // that the fen string could be of an illegal position. + for (size_t i = 0; i < keyCode.length(); i++) + { + if (keyCode[i] == 'K') + upcase = !upcase; + + s << char(upcase? toupper(keyCode[i]) : tolower(keyCode[i])); + } + s << 8 - keyCode.length() << "/8/8/8/8/8/8/8 w -"; + return Position(s.str()).get_material_key(); +} + +void EndgameFunctions::add(const string& keyCode, EndgameEvaluationFunctionBase* f) { + + EEFmap.insert(std::pair(buildKey(keyCode), f)); +} + +void EndgameFunctions::add(const string& keyCode, Color c, EndgameScalingFunctionBase* f) { + + ScalingInfo s = {c, f}; + ESFmap.insert(std::pair(buildKey(keyCode), s)); +} + +EndgameEvaluationFunctionBase* EndgameFunctions::getEEF(Key key) const { + + std::map::const_iterator it(EEFmap.find(key)); + return (it != EEFmap.end() ? it->second : NULL); +} + +EndgameScalingFunctionBase* EndgameFunctions::getESF(Key key, Color* c) const { + + std::map::const_iterator it(ESFmap.find(key)); + if (it == ESFmap.end()) + return NULL; + + *c = it->second.col; + return it->second.fun; +}