2 Stockfish, a UCI chess playing engine derived from Glaurung 2.1
3 Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
4 Copyright (C) 2008 Marco Costalba
6 Stockfish is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 Stockfish is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #if !defined(ENDGAME_H_INCLUDED)
22 #define ENDGAME_H_INCLUDED
39 // Evaluation functions
40 KXK, // Generic "mate lone king" eval
48 KmmKm, // K and two minors vs K and one or two minors
54 KRPPKRP, // KRPP vs KRP
55 KPsK, // King and pawns vs king
63 /// Template abstract base class for all special endgame functions
66 class EndgameFunctionBase {
68 EndgameFunctionBase(Color c) : strongerSide(c) { weakerSide = opposite_color(strongerSide); }
69 virtual ~EndgameFunctionBase() {}
70 virtual T apply(const Position&) = 0;
73 Color strongerSide, weakerSide;
76 typedef EndgameFunctionBase<Value> EndgameEvaluationFunctionBase;
77 typedef EndgameFunctionBase<ScaleFactor> EndgameScalingFunctionBase;
80 /// Templates subclass for various concrete endgames
83 struct EvaluationFunction : public EndgameEvaluationFunctionBase {
84 explicit EvaluationFunction(Color c): EndgameEvaluationFunctionBase(c) {}
85 Value apply(const Position&);
89 struct ScalingFunction : public EndgameScalingFunctionBase {
90 explicit ScalingFunction(Color c) : EndgameScalingFunctionBase(c) {}
91 ScaleFactor apply(const Position&);
96 //// Constants and variables
99 extern EvaluationFunction<KXK> EvaluateKXK, EvaluateKKX; // Generic "mate lone king" eval
100 extern EvaluationFunction<KBNK> EvaluateKBNK, EvaluateKKBN; // KBN vs K
101 extern EvaluationFunction<KPK> EvaluateKPK, EvaluateKKP; // KP vs K
102 extern EvaluationFunction<KRKP> EvaluateKRKP, EvaluateKPKR; // KR vs KP
103 extern EvaluationFunction<KRKB> EvaluateKRKB, EvaluateKBKR; // KR vs KB
104 extern EvaluationFunction<KRKN> EvaluateKRKN, EvaluateKNKR; // KR vs KN
105 extern EvaluationFunction<KQKR> EvaluateKQKR, EvaluateKRKQ; // KQ vs KR
106 extern EvaluationFunction<KBBKN> EvaluateKBBKN, EvaluateKNKBB; // KBB vs KN
107 extern EvaluationFunction<KmmKm> EvaluateKmmKm; // K and two minors vs K and one or two minors:
109 extern ScalingFunction<KBPK> ScaleKBPK, ScaleKKBP; // KBP vs K
110 extern ScalingFunction<KQKRP> ScaleKQKRP, ScaleKRPKQ; // KQ vs KRP
111 extern ScalingFunction<KRPKR> ScaleKRPKR, ScaleKRKRP; // KRP vs KR
112 extern ScalingFunction<KRPPKRP> ScaleKRPPKRP, ScaleKRPKRPP; // KRPP vs KRP
113 extern ScalingFunction<KPsK> ScaleKPsK, ScaleKKPs; // King and pawns vs king
114 extern ScalingFunction<KBPKB> ScaleKBPKB, ScaleKBKBP; // KBP vs KB
115 extern ScalingFunction<KBPPKB> ScaleKBPPKB, ScaleKBKBPP; // KBPP vs KB
116 extern ScalingFunction<KBPKN> ScaleKBPKN, ScaleKNKBP; // KBP vs KN
117 extern ScalingFunction<KNPK> ScaleKNPK, ScaleKKNP; // KNP vs K
118 extern ScalingFunction<KPKP> ScaleKPKPw, ScaleKPKPb; // KP vs KP
124 extern void init_bitbases();
127 #endif // !defined(ENDGAME_H_INCLUDED)