2 Stockfish, a UCI chess playing engine derived from Glaurung 2.1
3 Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
4 Copyright (C) 2008-2009 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
40 VALUE_TYPE_EVAL = 4, // Evaluation cache
41 VALUE_TYPE_EV_UP = 5, // Evaluation cache for upper bound
42 VALUE_TYPE_EV_LO = 6 // Evaluation cache for lower bound
48 VALUE_KNOWN_WIN = 15000,
50 VALUE_INFINITE = 30001,
56 //// Constants and variables
59 /// Piece values, middle game and endgame
61 /// Important: If the material values are changed, one must also
62 /// adjust the piece square tables, and the method game_phase() in the
65 /// Values modified by Joona Kiiski
67 const Value PawnValueMidgame = Value(0x0C6);
68 const Value PawnValueEndgame = Value(0x102);
69 const Value KnightValueMidgame = Value(0x331);
70 const Value KnightValueEndgame = Value(0x34E);
71 const Value BishopValueMidgame = Value(0x344);
72 const Value BishopValueEndgame = Value(0x359);
73 const Value RookValueMidgame = Value(0x4F6);
74 const Value RookValueEndgame = Value(0x4FE);
75 const Value QueenValueMidgame = Value(0x9D9);
76 const Value QueenValueEndgame = Value(0x9FE);
78 const Value PieceValueMidgame[17] = {
80 PawnValueMidgame, KnightValueMidgame, BishopValueMidgame,
81 RookValueMidgame, QueenValueMidgame,
82 Value(0), Value(0), Value(0),
83 PawnValueMidgame, KnightValueMidgame, BishopValueMidgame,
84 RookValueMidgame, QueenValueMidgame,
85 Value(0), Value(0), Value(0)
88 const Value PieceValueEndgame[17] = {
90 PawnValueEndgame, KnightValueEndgame, BishopValueEndgame,
91 RookValueEndgame, QueenValueEndgame,
92 Value(0), Value(0), Value(0),
93 PawnValueEndgame, KnightValueEndgame, BishopValueEndgame,
94 RookValueEndgame, QueenValueEndgame,
95 Value(0), Value(0), Value(0)
98 /// Bonus for having the side to move (modified by Joona Kiiski)
100 const Value TempoValueMidgame = Value(48);
101 const Value TempoValueEndgame = Value(22);
105 //// Inline functions
108 inline Value operator+ (Value v, int i) { return Value(int(v) + i); }
109 inline Value operator+ (Value v1, Value v2) { return Value(int(v1) + int(v2)); }
110 inline void operator+= (Value &v1, Value v2) {
111 v1 = Value(int(v1) + int(v2));
113 inline Value operator- (Value v, int i) { return Value(int(v) - i); }
114 inline Value operator- (Value v) { return Value(-int(v)); }
115 inline Value operator- (Value v1, Value v2) { return Value(int(v1) - int(v2)); }
116 inline void operator-= (Value &v1, Value v2) {
117 v1 = Value(int(v1) - int(v2));
119 inline Value operator* (Value v, int i) { return Value(int(v) * i); }
120 inline void operator*= (Value &v, int i) { v = Value(int(v) * i); }
121 inline Value operator* (int i, Value v) { return Value(int(v) * i); }
122 inline Value operator/ (Value v, int i) { return Value(int(v) / i); }
123 inline void operator/= (Value &v, int i) { v = Value(int(v) / i); }
126 inline Value value_mate_in(int ply) {
127 return Value(VALUE_MATE - Value(ply));
130 inline Value value_mated_in(int ply) {
131 return Value(-VALUE_MATE + Value(ply));
134 inline bool is_upper_bound(ValueType vt) {
135 return (int(vt) & int(VALUE_TYPE_UPPER)) != 0;
138 inline bool is_lower_bound(ValueType vt) {
139 return (int(vt) & int(VALUE_TYPE_LOWER)) != 0;
142 inline Value piece_value_midgame(PieceType pt) {
143 return PieceValueMidgame[pt];
146 inline Value piece_value_endgame(PieceType pt) {
147 return PieceValueEndgame[pt];
150 inline Value piece_value_midgame(Piece p) {
151 return PieceValueMidgame[p];
154 inline Value piece_value_endgame(Piece p) {
155 return PieceValueEndgame[p];
163 extern Value value_to_tt(Value v, int ply);
164 extern Value value_from_tt(Value v, int ply);
165 extern int value_to_centipawns(Value v);
166 extern Value value_from_centipawns(int cp);
167 extern const std::string value_to_string(Value v);
170 #endif // !defined(VALUE_H_INCLUDED)