-const Bitboard RelativeRankBB[2][8] = {
- { Rank1BB, Rank2BB, Rank3BB, Rank4BB, Rank5BB, Rank6BB, Rank7BB, Rank8BB },
- { Rank8BB, Rank7BB, Rank6BB, Rank5BB, Rank4BB, Rank3BB, Rank2BB, Rank1BB }
-};
-
-const Bitboard InFrontBB[2][8] = {
- { Rank2BB | Rank3BB | Rank4BB | Rank5BB | Rank6BB | Rank7BB | Rank8BB,
- Rank3BB | Rank4BB | Rank5BB | Rank6BB | Rank7BB | Rank8BB,
- Rank4BB | Rank5BB | Rank6BB | Rank7BB | Rank8BB,
- Rank5BB | Rank6BB | Rank7BB | Rank8BB,
- Rank6BB | Rank7BB | Rank8BB,
- Rank7BB | Rank8BB,
- Rank8BB,
- EmptyBoardBB
- },
- { EmptyBoardBB,
- Rank1BB,
- Rank2BB | Rank1BB,
- Rank3BB | Rank2BB | Rank1BB,
- Rank4BB | Rank3BB | Rank2BB | Rank1BB,
- Rank5BB | Rank4BB | Rank3BB | Rank2BB | Rank1BB,
- Rank6BB | Rank5BB | Rank4BB | Rank3BB | Rank2BB | Rank1BB,
- Rank7BB | Rank6BB | Rank5BB | Rank4BB | Rank3BB | Rank2BB | Rank1BB
- }
-};
-
-Bitboard RMask[64];
-int RAttackIndex[64];
-Bitboard RAttacks[0x19000];
-
-Bitboard BMask[64];
-int BAttackIndex[64];
-Bitboard BAttacks[0x1480];
-
-Bitboard SetMaskBB[65];
-Bitboard ClearMaskBB[65];
-
-Bitboard StepAttackBB[16][64];
-Bitboard RayBB[64][8];
-Bitboard BetweenBB[64][64];
-
-Bitboard SquaresInFrontMask[2][64];
-Bitboard PassedPawnMask[2][64];
-Bitboard AttackSpanMask[2][64];
-
-Bitboard BishopPseudoAttacks[64];
-Bitboard RookPseudoAttacks[64];
-Bitboard QueenPseudoAttacks[64];
-
-uint8_t BitCount8Bit[256];
-
-
-////
-//// Local definitions
-////
-
-namespace {
-
- void init_masks();
- void init_ray_bitboards();
- void init_attacks();
- void init_between_bitboards();
- void init_pseudo_attacks();
- Bitboard index_to_bitboard(int index, Bitboard mask);
- Bitboard sliding_attacks(int sq, Bitboard block, int dirs, int deltas[][2],
- int fmin, int fmax, int rmin, int rmax);
- void init_sliding_attacks(Bitboard attacks[], int attackIndex[], Bitboard mask[],
- const int shift[], const Bitboard mult[], int deltas[][2]);