public static UInt64 GetKnightAttacksBitboard(UInt64 knightsBitboard, UInt64 friends)
{
UInt64 result = 0;
while (knightsBitboard > 0)
{
var sq = knightsBitboard.GetLeadingSquare();
knightsBitboard = knightsBitboard.Clear(sq);
result |= GetKnightAttacksBitboard(sq);
}
return result & (~friends);
}