public static UInt64 GetKingAttacks(UInt64 king)
{
UInt64 attacks = BitOps.OneStepEast(king) | BitOps.OneStepWest(king);
king |= attacks;
attacks |= BitOps.OneStepNorth(king) | BitOps.OneStepSouth(king);
return(attacks);
}
private static UInt64 GetKnightAttacks(UInt64 knights)
{
UInt64 west, east, attacks;
east = BitOps.OneStepEast(knights);
west = BitOps.OneStepWest(knights);
attacks = (east | west) << 16;
attacks |= (east | west) >> 16;
east = BitOps.OneStepEast(east);
west = BitOps.OneStepWest(west);
attacks |= (east | west) << 8;
attacks |= (east | west) >> 8;
return(attacks);
}
public static void initRayAttacks()
{
UInt64 rayAttack;
for (byte i = 0; i < 64; i++)
{
UInt64 square = 1UL << i;
//nort
rayAttack = BitOps.OneStepNorth(square);
rayAttack |= BitOps.OneStepNorth(rayAttack);
rayAttack |= BitOps.OneStepNorth(rayAttack);
rayAttack |= BitOps.OneStepNorth(rayAttack);
rayAttack |= BitOps.OneStepNorth(rayAttack);
rayAttack |= BitOps.OneStepNorth(rayAttack);
rayAttack |= BitOps.OneStepNorth(rayAttack);
rayAttacks[0, i] = rayAttack;
//sout
rayAttack = BitOps.OneStepSouth(square);
rayAttack |= BitOps.OneStepSouth(rayAttack);
rayAttack |= BitOps.OneStepSouth(rayAttack);
rayAttack |= BitOps.OneStepSouth(rayAttack);
rayAttack |= BitOps.OneStepSouth(rayAttack);
rayAttack |= BitOps.OneStepSouth(rayAttack);
rayAttack |= BitOps.OneStepSouth(rayAttack);
rayAttacks[1, i] = rayAttack;
//east
rayAttack = BitOps.OneStepEast(square);
rayAttack |= BitOps.OneStepEast(rayAttack);
rayAttack |= BitOps.OneStepEast(rayAttack);
rayAttack |= BitOps.OneStepEast(rayAttack);
rayAttack |= BitOps.OneStepEast(rayAttack);
rayAttack |= BitOps.OneStepEast(rayAttack);
rayAttack |= BitOps.OneStepEast(rayAttack);
rayAttacks[2, i] = rayAttack;
//west
rayAttack = BitOps.OneStepWest(square);
rayAttack |= BitOps.OneStepWest(rayAttack);
rayAttack |= BitOps.OneStepWest(rayAttack);
rayAttack |= BitOps.OneStepWest(rayAttack);
rayAttack |= BitOps.OneStepWest(rayAttack);
rayAttack |= BitOps.OneStepWest(rayAttack);
rayAttack |= BitOps.OneStepWest(rayAttack);
rayAttacks[3, i] = rayAttack;
//noEa
rayAttack = BitOps.OneStepNorthEast(square);
rayAttack |= BitOps.OneStepNorthEast(rayAttack);
rayAttack |= BitOps.OneStepNorthEast(rayAttack);
rayAttack |= BitOps.OneStepNorthEast(rayAttack);
rayAttack |= BitOps.OneStepNorthEast(rayAttack);
rayAttack |= BitOps.OneStepNorthEast(rayAttack);
rayAttack |= BitOps.OneStepNorthEast(rayAttack);
rayAttacks[4, i] = rayAttack;
//soWe
rayAttack = BitOps.OneStepSouthWest(square);
rayAttack |= BitOps.OneStepSouthWest(rayAttack);
rayAttack |= BitOps.OneStepSouthWest(rayAttack);
rayAttack |= BitOps.OneStepSouthWest(rayAttack);
rayAttack |= BitOps.OneStepSouthWest(rayAttack);
rayAttack |= BitOps.OneStepSouthWest(rayAttack);
rayAttack |= BitOps.OneStepSouthWest(rayAttack);
rayAttacks[5, i] = rayAttack;
//noWe
rayAttack = BitOps.OneStepNorthWest(square);
rayAttack |= BitOps.OneStepNorthWest(rayAttack);
rayAttack |= BitOps.OneStepNorthWest(rayAttack);
rayAttack |= BitOps.OneStepNorthWest(rayAttack);
rayAttack |= BitOps.OneStepNorthWest(rayAttack);
rayAttack |= BitOps.OneStepNorthWest(rayAttack);
rayAttack |= BitOps.OneStepNorthWest(rayAttack);
rayAttacks[6, i] = rayAttack;
//soEa
rayAttack = BitOps.OneStepSouthEast(square);
rayAttack |= BitOps.OneStepSouthEast(rayAttack);
rayAttack |= BitOps.OneStepSouthEast(rayAttack);
rayAttack |= BitOps.OneStepSouthEast(rayAttack);
rayAttack |= BitOps.OneStepSouthEast(rayAttack);
rayAttack |= BitOps.OneStepSouthEast(rayAttack);
rayAttack |= BitOps.OneStepSouthEast(rayAttack);
rayAttacks[7, i] = rayAttack;
}
}
