/*
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
////
#include <cassert>
+#include <sstream>
#include <map>
#include "material.h"
+using std::string;
////
//// Local definitions
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;
- };
-
+ // Unmapped endgame evaluation and scaling functions, these
+ // are accessed direcly and not through the function maps.
+ EvaluationFunction<KmmKm> EvaluateKmmKm(WHITE);
+ EvaluationFunction<KXK> EvaluateKXK(WHITE), EvaluateKKX(BLACK);
+ ScalingFunction<KBPK> ScaleKBPK(WHITE), ScaleKKBP(BLACK);
+ ScalingFunction<KQKRP> ScaleKQKRP(WHITE), ScaleKRPKQ(BLACK);
+ ScalingFunction<KPsK> ScaleKPsK(WHITE), ScaleKKPs(BLACK);
+ ScalingFunction<KPKP> ScaleKPKPw(WHITE), ScaleKPKPb(BLACK);
}
+
////
//// Classes
////
+
+/// See header for a class description. It is declared here to avoid
+/// to include <map> in the header file.
+
class EndgameFunctions {
+ typedef EndgameEvaluationFunctionBase EF;
+ typedef EndgameScalingFunctionBase SF;
+
public:
EndgameFunctions();
- EndgameEvaluationFunction* getEEF(Key key);
- ScalingInfo getESF(Key key);
+ ~EndgameFunctions();
+ EF* getEEF(Key key) const;
+ SF* getESF(Key key, Color* c) const;
private:
- void add(Key k, EndgameEvaluationFunction* f);
- void add(Key k, Color c, ScalingFunction* f);
+ Key buildKey(const string& keyCode);
+ const string swapColors(const string& keyCode);
+ template<EndgameType> void add_ef(const string& keyCode);
+ template<EndgameType> void add_sf(const string& keyCode);
+
+ struct ScalingInfo
+ {
+ Color col;
+ SF* fun;
+ };
- std::map<Key, EndgameEvaluationFunction*> EEFmap;
+ std::map<Key, EF*> EEFmap;
std::map<Key, ScalingInfo> ESFmap;
};
//// Functions
////
-/// 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() {
-
- typedef Key ZM[2][8][16];
- const ZM& z = Position::zobMaterial;
-
- KNNKMaterialKey = z[WHITE][KNIGHT][1] ^ z[WHITE][KNIGHT][2];
- KKNNMaterialKey = z[BLACK][KNIGHT][1] ^ z[BLACK][KNIGHT][2];
-}
-
/// Constructor for the MaterialInfoTable class
{
std::cerr << "Failed to allocate " << (numOfEntries * sizeof(MaterialInfo))
<< " bytes for material hash table." << std::endl;
- exit(EXIT_FAILURE);
+ Application::exit_with_failure();
}
- clear();
}
MaterialInfoTable::~MaterialInfoTable() {
- delete [] entries;
delete funcs;
-}
-
-
-/// MaterialInfoTable::clear() clears a material hash table by setting
-/// all entries to 0.
-
-void MaterialInfoTable::clear() {
-
- memset(entries, 0, size * sizeof(MaterialInfo));
+ delete [] entries;
}
/// 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);
// 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 mi;
// Clear the MaterialInfo object, and set its key
mi->clear();
// 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.
+ // 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)
+ && pos.non_pawn_material(WHITE) >= RookValueMidgame)
{
mi->evaluationFunction = &EvaluateKXK;
return mi;
}
else if ( pos.non_pawn_material(WHITE) == Value(0)
&& pos.piece_count(WHITE, PAWN) == 0
- && pos.non_pawn_material(BLACK) >= RookValueEndgame)
+ && pos.non_pawn_material(BLACK) >= RookValueMidgame)
{
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?
//
// The code below is rather messy, and it could easily get worse later,
- // if we decide to add more special cases. We face problems when there
+ // 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.
- ScalingInfo si = funcs->getESF(key);
- if (si.fun != NULL)
+ Color c;
+ EndgameScalingFunctionBase* sf;
+
+ if ((sf = funcs->getESF(key, &c)) != NULL)
{
- mi->scalingFunction[si.col] = si.fun;
+ mi->scalingFunction[c] = sf;
return mi;
}
}
}
+ // 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);
egValue -= sign * v;
}
}
-
mi->mgValue = int16_t(mgValue);
mi->egValue = int16_t(egValue);
return mi;
}
-/// EndgameFunctions members definition. This helper 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. Being per thread avoids to use locks to access them.
+/// 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 needed
+/// because std::map is not guaranteed to be thread-safe even if accessed
+/// only for a lookup.
EndgameFunctions::EndgameFunctions() {
- typedef Key ZM[2][8][16];
- const ZM& z = Position::zobMaterial;
-
- static const Color W = WHITE;
- static const Color B = BLACK;
-
- KNNKMaterialKey = z[W][KNIGHT][1] ^ z[W][KNIGHT][2];
- KKNNMaterialKey = z[B][KNIGHT][1] ^ z[B][KNIGHT][2];
-
- 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);
-
- add(z[W][KNIGHT][1] ^ z[W][PAWN][1], W, &ScaleKNPK);
- add(z[B][KNIGHT][1] ^ z[B][PAWN][1], B, &ScaleKKNP);
-
- 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);
+ KNNKMaterialKey = buildKey("KNNK");
+ KKNNMaterialKey = buildKey("KKNN");
+
+ add_ef<KPK>("KPK");
+ add_ef<KBNK>("KBNK");
+ add_ef<KRKP>("KRKP");
+ add_ef<KRKB>("KRKB");
+ add_ef<KRKN>("KRKN");
+ add_ef<KQKR>("KQKR");
+ add_ef<KBBKN>("KBBKN");
+
+ add_sf<KNPK>("KNPK");
+ add_sf<KRPKR>("KRPKR");
+ add_sf<KBPKB>("KBPKB");
+ add_sf<KBPPKB>("KBPPKB");
+ add_sf<KBPKN>("KBPKN");
+ add_sf<KRPPKRP>("KRPPKRP");
+ add_sf<KRPPKRP>("KRPPKRP");
+}
+
+EndgameFunctions::~EndgameFunctions() {
+
+ for (std::map<Key, EF*>::iterator it = EEFmap.begin(); it != EEFmap.end(); ++it)
+ delete (*it).second;
+
+ for (std::map<Key, ScalingInfo>::iterator it = ESFmap.begin(); it != ESFmap.end(); ++it)
+ delete (*it).second.fun;
+}
+
+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(Key k, EndgameEvaluationFunction* f) {
+const string EndgameFunctions::swapColors(const string& keyCode) {
- EEFmap.insert(std::pair<Key, EndgameEvaluationFunction*>(k, f));
+ // Build corresponding key for the opposite color: "KBPKN" -> "KNKBP"
+ size_t idx = keyCode.find("K", 1);
+ return keyCode.substr(idx) + keyCode.substr(0, idx);
}
-void EndgameFunctions::add(Key k, Color c, ScalingFunction* f) {
+template<EndgameType et>
+void EndgameFunctions::add_ef(const string& keyCode) {
- ScalingInfo s = {c, f};
- ESFmap.insert(std::pair<Key, ScalingInfo>(k, s));
+ EEFmap.insert(std::pair<Key, EF*>(buildKey(keyCode), new EvaluationFunction<et>(WHITE)));
+ EEFmap.insert(std::pair<Key, EF*>(buildKey(swapColors(keyCode)), new EvaluationFunction<et>(BLACK)));
}
-EndgameEvaluationFunction* EndgameFunctions::getEEF(Key key) {
+template<EndgameType et>
+void EndgameFunctions::add_sf(const string& keyCode) {
+
+ ScalingInfo s1 = {WHITE, new ScalingFunction<et>(WHITE)};
+ ScalingInfo s2 = {BLACK, new ScalingFunction<et>(BLACK)};
+
+ ESFmap.insert(std::pair<Key, ScalingInfo>(buildKey(keyCode), s1));
+ ESFmap.insert(std::pair<Key, ScalingInfo>(buildKey(swapColors(keyCode)), s2));
+}
- EndgameEvaluationFunction* f = NULL;
- std::map<Key, EndgameEvaluationFunction*>::iterator it(EEFmap.find(key));
- if (it != EEFmap.end())
- f = it->second;
+EndgameEvaluationFunctionBase* EndgameFunctions::getEEF(Key key) const {
- return f;
+ std::map<Key, EF*>::const_iterator it(EEFmap.find(key));
+ return (it != EEFmap.end() ? it->second : NULL);
}
-ScalingInfo EndgameFunctions::getESF(Key key) {
+EndgameScalingFunctionBase* EndgameFunctions::getESF(Key key, Color* c) const {
- ScalingInfo si = {WHITE, NULL};
- std::map<Key, ScalingInfo>::iterator it(ESFmap.find(key));
- if (it != ESFmap.end())
- si = it->second;
+ std::map<Key, ScalingInfo>::const_iterator it(ESFmap.find(key));
+ if (it == ESFmap.end())
+ return NULL;
- return si;
+ *c = it->second.col;
+ return it->second.fun;
}
projects / stockfish / blobdiff