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(MOVE_H_INCLUDED)
22 #define MOVE_H_INCLUDED
41 /// A move needs 17 bits to be stored
43 /// bit 0- 5: destination square (from 0 to 63)
44 /// bit 6-11: origin square (from 0 to 63)
45 /// bit 12-14: promotion piece type
46 /// bit 15: en passant flag
47 /// bit 16: castle flag
49 /// Special cases are MOVE_NONE and MOVE_NULL. We can sneak these in
50 /// because in any normal move destination square is always different
51 /// from origin square while MOVE_NONE and MOVE_NULL have the same
52 /// origin and destination square, 0 and 1 respectively.
70 inline Square move_from(Move m) {
71 return Square((int(m) >> 6) & 0x3F);
74 inline Square move_to(Move m) {
75 return Square(m & 0x3F);
78 inline PieceType move_promotion(Move m) {
79 return PieceType((int(m) >> 12) & 7);
82 inline bool move_is_ep(Move m) {
83 return bool((int(m) >> 15) & 1);
86 inline bool move_is_castle(Move m) {
87 return bool((int(m) >> 16) & 1);
90 inline bool move_is_short_castle(Move m) {
91 return move_is_castle(m) && (move_to(m) > move_from(m));
94 inline bool move_is_long_castle(Move m) {
95 return move_is_castle(m) && (move_to(m) < move_from(m));
98 inline Move make_promotion_move(Square from, Square to, PieceType promotion) {
99 return Move(int(to) | (int(from) << 6) | (int(promotion) << 12));
102 inline Move make_move(Square from, Square to) {
103 return Move(int(to) | (int(from) << 6));
106 inline Move make_castle_move(Square from, Square to) {
107 return Move(int(to) | (int(from) << 6) | (1 << 16));
110 inline Move make_ep_move(Square from, Square to) {
111 return Move(int(to) | (int(from) << 6) | (1 << 15));
119 extern std::ostream &operator << (std::ostream &os, Move m);
120 extern Move move_from_string(const Position &pos, const std::string &str);
121 extern const std::string move_to_string(Move m);
122 extern bool move_is_ok(Move m);
125 #endif // !defined(MOVE_H_INCLUDED)