board.h

   1 /*
   2  *      This program is free software; you can redistribute it and/or modify
   3  *      it under the terms of the GNU General Public License as published by
   4  *      the Free Software Foundation; either version 2 of the License, or
   5  *      (at your option) any later version.
   6  *
   7  *      This program is distributed in the hope that it will be useful,
   8  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *      GNU General Public License for more details.
  11  *
  12  *      You should have received a copy of the GNU General Public License
  13  *      along with this program; if not, write to the Free Software
  14  *      Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  15  */
  16 #define WHITE_CASTLE_KINGSIDE    (1 << 0)
  17 #define WHITE_CASTLE_QUEENSIDE   (1 << 1)
  18 #define BLACK_CASTLE_KINGSIDE    (1 << 2)
  19 #define BLACK_CASTLE_QUEENSIDE   (1 << 3)
  20
  21 struct board_t {
  22         int cap_piece;                          /* if we are capturing piece now */
  23         int castle_mask;                        /* a mask of allowed castle moves */
  24         int ep;                                         /* enpassant target */
  25         int kings[2];                           /* kings locations */
  26         int wtm;                                        /* side to move */
  27         int fifty_rule;                         /* number of moves after last capture or pawn
  28                                                                    move */
  29         int move;                                       /* last move */
  30         uint64_t hash_key;                      /* zobrist key */
  31         uint64_t hash_pawn_key;
  32 };
  33
  34 struct game_history_t {
  35         int count;
  36         struct board_t board[1024];
  37 };
  38
  39 /* see board.c for comments */
  40 extern const char *char_board[64];
  41 extern const char char_pieces[7];
  42
  43 extern int bitcount[65536];
  44 extern int lzArray[65536];
  45 extern uint64_t isolated_mask[8];
  46 extern uint64_t passer_mask[2][64];
  47 extern uint64_t pawn_moves[2][64];
  48 extern uint64_t piece_moves[7][64];
  49 extern uint64_t forward_ray[2][64];
  50 extern uint64_t king_shield[2][64];
  51
  52 extern int distance[64][64];
  53 extern const uint64_t file_bit[8];
  54
  55 extern int square64[64];
  56 extern struct board_t brd;
  57 extern struct game_history_t game_history;
  58 extern uint64_t complete;
  59
  60 extern uint64_t piece_boards[2][7];
  61 extern uint64_t r_pieces[2];
  62 extern uint64_t side_boards[2];
  63
  64 extern int castled[2];
  65
  66 extern int material_complete[2];
  67 extern int material_pawns[2];
  68 extern int material_pieces[2];
  69
  70 extern int piece_value[7];
  71 extern int piece_count[2][7];
  72
  73 /* functions */
  74 void add_piece(int square, int piece, int side);
  75 void calc_zobrist(uint64_t *hash_key, uint64_t *hash_pawn_key);
  76 char *current_fen_position(char *buf);
  77 void remove_piece(int square, int piece, int side);
  78 int reps(void);
  79 int SEE(int move);
  80 int setup_board(char *fen);
  81 void update_boards(void);
  82
  83 /* debuging functions */
  84 int board_is_legal(struct board_t *b);
  85 void print_bb(uint64_t b);
  86 void print_board(void);
  87
  88 /* some defines for simplicity only */
  89 #define PAWNS(side)             (piece_boards[side][PAWN])
  90 #define KNIGHTS(side)   (piece_boards[side][KNIGHT])
  91 #define BISHOPS(side)   (piece_boards[side][BISHOP])
  92 #define ROOKS(side)             (piece_boards[side][ROOK])
  93 #define QUEENS(side)    (piece_boards[side][QUEEN])
  94 #define KING(side)              (piece_boards[side][KING])
  95
  96 #define wpc             piece_count[WHITE][PAWN]
  97 #define bpc             piece_count[BLACK][PAWN]
  98 #define wnc             piece_count[WHITE][KNIGHT]
  99 #define bnc             piece_count[BLACK][KNIGHT]
 100 #define wbc             piece_count[WHITE][BISHOP]
 101 #define bbc             piece_count[BLACK][BISHOP]
 102 #define wrc             piece_count[WHITE][ROOK]
 103 #define brc             piece_count[BLACK][ROOK]
 104 #define wqc             piece_count[WHITE][QUEEN]
 105 #define bqc             piece_count[BLACK][QUEEN]
 106
 107 /* evaluation of the position for material */
 108 #define MATERIAL_SCORE  (material_complete[brd.wtm] - material_complete[1 ^ brd.wtm])