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(VALUE_H_INCLUDED)
22 #define VALUE_H_INCLUDED
37 VALUE_TYPE_UPPER = 1, // Upper bound
38 VALUE_TYPE_LOWER = 2, // Lower bound
39 VALUE_TYPE_EXACT = 3 // Exact score
45 VALUE_KNOWN_WIN = 15000,
47 VALUE_INFINITE = 30001,
53 //// Constants and variables
56 /// Piece values, middle game and endgame
58 /// Important: If the material values are changed, one must also
59 /// adjust the piece square tables, and the method game_phase() in the
62 const Value PawnValueMidgame = Value(0xCC);
63 const Value PawnValueEndgame = Value(0x100);
64 const Value KnightValueMidgame = Value(0x340);
65 const Value KnightValueEndgame = Value(0x340);
66 const Value BishopValueMidgame = Value(0x340);
67 const Value BishopValueEndgame = Value(0x340);
68 const Value RookValueMidgame = Value(0x505);
69 const Value RookValueEndgame = Value(0x505);
70 const Value QueenValueMidgame = Value(0xA00);
71 const Value QueenValueEndgame = Value(0xA00);
73 const Value PieceValueMidgame[17] = {
75 PawnValueMidgame, KnightValueMidgame, BishopValueMidgame,
76 RookValueMidgame, QueenValueMidgame,
77 Value(0), Value(0), Value(0),
78 PawnValueMidgame, KnightValueMidgame, BishopValueMidgame,
79 RookValueMidgame, QueenValueMidgame,
80 Value(0), Value(0), Value(0)
83 const Value PieceValueEndgame[17] = {
85 PawnValueEndgame, KnightValueEndgame, BishopValueEndgame,
86 RookValueEndgame, QueenValueEndgame,
87 Value(0), Value(0), Value(0),
88 PawnValueEndgame, KnightValueEndgame, BishopValueEndgame,
89 RookValueEndgame, QueenValueEndgame,
90 Value(0), Value(0), Value(0)
93 /// Bonus for having the side to move
95 const Value TempoValueMidgame = Value(50);
96 const Value TempoValueEndgame = Value(20);
100 //// Inline functions
103 inline Value operator+ (Value v, int i) { return Value(int(v) + i); }
104 inline Value operator+ (Value v1, Value v2) { return Value(int(v1) + int(v2)); }
105 inline void operator+= (Value &v1, Value v2) {
106 v1 = Value(int(v1) + int(v2));
108 inline Value operator- (Value v, int i) { return Value(int(v) - i); }
109 inline Value operator- (Value v) { return Value(-int(v)); }
110 inline Value operator- (Value v1, Value v2) { return Value(int(v1) - int(v2)); }
111 inline void operator-= (Value &v1, Value v2) {
112 v1 = Value(int(v1) - int(v2));
114 inline Value operator* (Value v, int i) { return Value(int(v) * i); }
115 inline void operator*= (Value &v, int i) { v = Value(int(v) * i); }
116 inline Value operator* (int i, Value v) { return Value(int(v) * i); }
117 inline Value operator/ (Value v, int i) { return Value(int(v) / i); }
118 inline void operator/= (Value &v, int i) { v = Value(int(v) / i); }
121 inline Value value_mate_in(int ply) {
122 return Value(VALUE_MATE - Value(ply));
125 inline Value value_mated_in(int ply) {
126 return Value(-VALUE_MATE + Value(ply));
129 inline bool is_upper_bound(ValueType vt) {
130 return (int(vt) & int(VALUE_TYPE_UPPER)) != 0;
133 inline bool is_lower_bound(ValueType vt) {
134 return (int(vt) & int(VALUE_TYPE_LOWER)) != 0;
137 inline Value piece_value_midgame(PieceType pt) {
138 return PieceValueMidgame[pt];
141 inline Value piece_value_endgame(PieceType pt) {
142 return PieceValueEndgame[pt];
145 inline Value piece_value_midgame(Piece p) {
146 return PieceValueMidgame[p];
149 inline Value piece_value_endgame(Piece p) {
150 return PieceValueEndgame[p];
158 extern Value value_to_tt(Value v, int ply);
159 extern Value value_from_tt(Value v, int ply);
160 extern int value_to_centipawns(Value v);
161 extern Value value_from_centipawns(int cp);
162 extern const std::string value_to_string(Value v);
165 #endif // !defined(VALUE_H_INCLUDED)