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
46 VALUE_KNOWN_WIN = 15000,
48 VALUE_INFINITE = 30001,
54 //// Constants and variables
57 /// Piece values, middle game and endgame
59 /// Important: If the material values are changed, one must also
60 /// adjust the piece square tables, and the method game_phase() in the
63 /// Values modified by Joona Kiiski
65 const Value PawnValueMidgame = Value(0x0C6);
66 const Value PawnValueEndgame = Value(0x102);
67 const Value KnightValueMidgame = Value(0x331);
68 const Value KnightValueEndgame = Value(0x34E);
69 const Value BishopValueMidgame = Value(0x344);
70 const Value BishopValueEndgame = Value(0x359);
71 const Value RookValueMidgame = Value(0x4F6);
72 const Value RookValueEndgame = Value(0x4FE);
73 const Value QueenValueMidgame = Value(0x9D9);
74 const Value QueenValueEndgame = Value(0x9FE);
76 const Value PieceValueMidgame[17] = {
78 PawnValueMidgame, KnightValueMidgame, BishopValueMidgame,
79 RookValueMidgame, QueenValueMidgame,
80 Value(0), Value(0), Value(0),
81 PawnValueMidgame, KnightValueMidgame, BishopValueMidgame,
82 RookValueMidgame, QueenValueMidgame,
83 Value(0), Value(0), Value(0)
86 const Value PieceValueEndgame[17] = {
88 PawnValueEndgame, KnightValueEndgame, BishopValueEndgame,
89 RookValueEndgame, QueenValueEndgame,
90 Value(0), Value(0), Value(0),
91 PawnValueEndgame, KnightValueEndgame, BishopValueEndgame,
92 RookValueEndgame, QueenValueEndgame,
93 Value(0), Value(0), Value(0)
96 /// Bonus for having the side to move (modified by Joona Kiiski)
98 const Value TempoValueMidgame = Value(48);
99 const Value TempoValueEndgame = Value(21);
103 //// Inline functions
106 inline Value operator+ (Value v, int i) { return Value(int(v) + i); }
107 inline Value operator+ (Value v1, Value v2) { return Value(int(v1) + int(v2)); }
108 inline void operator+= (Value &v1, Value v2) {
109 v1 = Value(int(v1) + int(v2));
111 inline Value operator- (Value v, int i) { return Value(int(v) - i); }
112 inline Value operator- (Value v) { return Value(-int(v)); }
113 inline Value operator- (Value v1, Value v2) { return Value(int(v1) - int(v2)); }
114 inline void operator-= (Value &v1, Value v2) {
115 v1 = Value(int(v1) - int(v2));
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); }
119 inline Value operator* (int i, Value v) { return Value(int(v) * i); }
120 inline Value operator/ (Value v, int i) { return Value(int(v) / i); }
121 inline void operator/= (Value &v, int i) { v = Value(int(v) / i); }
124 inline Value value_mate_in(int ply) {
125 return Value(VALUE_MATE - Value(ply));
128 inline Value value_mated_in(int ply) {
129 return Value(-VALUE_MATE + Value(ply));
132 inline bool is_upper_bound(ValueType vt) {
133 return (int(vt) & int(VALUE_TYPE_UPPER)) != 0;
136 inline bool is_lower_bound(ValueType vt) {
137 return (int(vt) & int(VALUE_TYPE_LOWER)) != 0;
140 inline Value piece_value_midgame(PieceType pt) {
141 return PieceValueMidgame[pt];
144 inline Value piece_value_endgame(PieceType pt) {
145 return PieceValueEndgame[pt];
148 inline Value piece_value_midgame(Piece p) {
149 return PieceValueMidgame[p];
152 inline Value piece_value_endgame(Piece p) {
153 return PieceValueEndgame[p];
161 extern Value value_to_tt(Value v, int ply);
162 extern Value value_from_tt(Value v, int ply);
163 extern int value_to_centipawns(Value v);
164 extern Value value_from_centipawns(int cp);
165 extern const std::string value_to_string(Value v);
168 #endif // !defined(VALUE_H_INCLUDED)