public override ulong GetAttacks(Square figureSquare, ulong otherFigures)
{
int file = (int)figureSquare & 7;
int rank = (int)figureSquare >> 3;
ulong otherFiguresFile = otherFigures >> file;
ulong clearAFile = otherFiguresFile & (~BitBoardHelper.NotAFile);
byte rotatedFile = BitBoardHelper.GetRankFromAFile(clearAFile);
byte fileAttacks = RookBitBoardHelper.FirstRankAttacks[rank, rotatedFile];
ulong verticalAttacks = BitBoardHelper.GetFileFromRank(fileAttacks) << file;
ulong otherFiguresRank = otherFigures >> (8 * rank);
otherFiguresRank &= 255;
byte rankAttacks = RookBitBoardHelper.FirstRankAttacks[7 - file, (int)otherFiguresRank];
// in real int64 lower byte has mirrored bits
// 7 6 5 4 3 2 1 0 and in this 0 1 2 3 4 5 6 7
ulong horizontalAttacks = (ulong)(rankAttacks) << (8 * rank);
return(verticalAttacks | horizontalAttacks);
}
