/*
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) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
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 "position.h"
-#include "scale.h"
#include "value.h"
//// Types
////
-/// Abstract base class for all special endgame evaluation functions
-
-class EndgameEvaluationFunction {
-public:
- EndgameEvaluationFunction(Color c);
- virtual ~EndgameEvaluationFunction() { }
-
- virtual Value apply(const Position &pos) = 0;
-
-protected:
- Color strongerSide, weakerSide;
-};
-
-
-/// Template subclass for various concrete endgames
-
enum EndgameType {
+
+ // Evaluation functions
KXK, // Generic "mate lone king" eval
KBNK, // KBN vs K
KPK, // KP vs K
KRKN, // KR vs KN
KQKR, // KQ vs KR
KBBKN, // KBB vs KN
- KmmKm // K and two minors vs K and one or two minors
+ KNNK, // KNN vs K
+ KmmKm, // K and two minors vs K and one or two minors
+
+ // Scaling functions
+ KBPsK, // KB+pawns vs K
+ KQKRPs, // KQ vs KR+pawns
+ KRPKR, // KRP vs KR
+ KRPPKRP, // KRPP vs KRP
+ KPsK, // King and pawns vs king
+ KBPKB, // KBP vs KB
+ KBPPKB, // KBPP vs KB
+ KBPKN, // KBP vs KN
+ KNPK, // KNP vs K
+ KPKP // KP vs KP
};
-template<EndgameType>
-class EvaluationFunction : public EndgameEvaluationFunction {
-public:
- explicit EvaluationFunction(Color c): EndgameEvaluationFunction(c) {}
- Value apply(const Position& pos);
-};
+/// Template abstract base class for all special endgame functions
-/// Abstract base class for all evaluation scaling functions:
-
-class ScalingFunction {
+template<typename T>
+class EndgameFunctionBase {
public:
- ScalingFunction(Color c);
- virtual ~ScalingFunction() { }
-
- virtual ScaleFactor apply(const Position &pos) =0;
+ EndgameFunctionBase(Color c) : strongerSide(c), weakerSide(opposite_color(c)) {}
+ virtual ~EndgameFunctionBase() {}
+ virtual T apply(const Position&) const = 0;
+ Color color() const { return strongerSide; }
protected:
Color strongerSide, weakerSide;
};
+typedef EndgameFunctionBase<Value> EndgameEvaluationFunctionBase;
+typedef EndgameFunctionBase<ScaleFactor> EndgameScalingFunctionBase;
-/// Subclasses for various concrete endgames:
-
-// KBP vs K:
-class KBPKScalingFunction : public ScalingFunction {
-public:
- KBPKScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
-};
-
-// KQ vs KRP:
-class KQKRPScalingFunction: public ScalingFunction {
-public:
- KQKRPScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
-};
-
-// KRP vs KR:
-class KRPKRScalingFunction : public ScalingFunction {
-public:
- KRPKRScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
-};
-
-// KRPP vs KRP:
-class KRPPKRPScalingFunction : public ScalingFunction {
-public:
- KRPPKRPScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
-};
-
-// King and pawns vs king:
-class KPsKScalingFunction : public ScalingFunction {
-public:
- KPsKScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
-};
-
-// KBP vs KB:
-class KBPKBScalingFunction : public ScalingFunction {
-public:
- KBPKBScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
-};
-// KBP vs KN:
-class KBPKNScalingFunction : public ScalingFunction {
-public:
- KBPKNScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
-};
+/// Templates subclass for various concrete endgames
-// KNP vs K:
-class KNPKScalingFunction : public ScalingFunction {
-public:
- KNPKScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
+template<EndgameType>
+struct EvaluationFunction : public EndgameEvaluationFunctionBase {
+ typedef EndgameEvaluationFunctionBase Base;
+ explicit EvaluationFunction(Color c): EndgameEvaluationFunctionBase(c) {}
+ Value apply(const Position&) const;
};
-// KP vs KP:
-class KPKPScalingFunction : public ScalingFunction {
-public:
- KPKPScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
+template<EndgameType>
+struct ScalingFunction : public EndgameScalingFunctionBase {
+ typedef EndgameScalingFunctionBase Base;
+ explicit ScalingFunction(Color c) : EndgameScalingFunctionBase(c) {}
+ ScaleFactor apply(const Position&) const;
};
-////
-//// Constants and variables
-////
-
-extern EvaluationFunction<KXK> EvaluateKXK, EvaluateKKX; // Generic "mate lone king" eval
-extern EvaluationFunction<KBNK> EvaluateKBNK, EvaluateKKBN; // KBN vs K
-extern EvaluationFunction<KPK> EvaluateKPK, EvaluateKKP; // KP vs K
-extern EvaluationFunction<KRKP> EvaluateKRKP, EvaluateKPKR; // KR vs KP
-extern EvaluationFunction<KRKB> EvaluateKRKB, EvaluateKBKR; // KR vs KB
-extern EvaluationFunction<KRKN> EvaluateKRKN, EvaluateKNKR; // KR vs KN
-extern EvaluationFunction<KQKR> EvaluateKQKR, EvaluateKRKQ; // KQ vs KR
-extern EvaluationFunction<KBBKN> EvaluateKBBKN, EvaluateKNKBB; // KBB vs KN
-extern EvaluationFunction<KmmKm> EvaluateKmmKm; // K and two minors vs K and one or two minors:
-
-// KBP vs K:
-extern KBPKScalingFunction ScaleKBPK, ScaleKKBP;
-
-// KQ vs KRP:
-extern KQKRPScalingFunction ScaleKQKRP, ScaleKRPKQ;
-
-// KRP vs KR:
-extern KRPKRScalingFunction ScaleKRPKR, ScaleKRKRP;
-
-// KRPP vs KRP:
-extern KRPPKRPScalingFunction ScaleKRPPKRP, ScaleKRPKRPP;
-
-// King and pawns vs king:
-extern KPsKScalingFunction ScaleKPsK, ScaleKKPs;
-
-// KBP vs KB:
-extern KBPKBScalingFunction ScaleKBPKB, ScaleKBKBP;
-
-// KBP vs KN:
-extern KBPKNScalingFunction ScaleKBPKN, ScaleKNKBP;
-
-// KNP vs K:
-extern KNPKScalingFunction ScaleKNPK, ScaleKKNP;
-
-// KP vs KP:
-extern KPKPScalingFunction ScaleKPKPw, ScaleKPKPb;
-
-
////
//// Prototypes
////
projects / stockfish / blobdiff