public ulong Captures(ulong currentPieces, ulong opponentPieces, ulong location)
{
// from our current location, we can move in any direction
// as long as we continually encounter opponent pieces
// we capture them all as long as the first non opponent piece contains a current player piece
ulong captures = 0ul;
int loc_index = BitTwiddling.TrailingZeroCount(location);
int row = loc_index / 8;
int col = loc_index % 8;
captures |= Look(currentPieces, opponentPieces, row, col, -1, 0); // up
captures |= Look(currentPieces, opponentPieces, row, col, 1, 0); // down
captures |= Look(currentPieces, opponentPieces, row, col, 0, -1); // left
captures |= Look(currentPieces, opponentPieces, row, col, 0, 1); // right
captures |= Look(currentPieces, opponentPieces, row, col, -1, -1); // up left
captures |= Look(currentPieces, opponentPieces, row, col, -1, 1); // up right
captures |= Look(currentPieces, opponentPieces, row, col, 1, -1); // down left
captures |= Look(currentPieces, opponentPieces, row, col, 1, 1); // down right
return(captures);
}
public string DescribeLastMove() => BitTwiddling.TrailingZeroCount(lastMove).ToString();