private bool _IsCheck(int[] dx, int[] dy, Board.PieceGetter GetPiece)
{
for (int i = 0; i < dx.Length; i++)
{
Point delta = new Point(dx[i], dy[i]);
ImmutablePiece piece = GetPiece(king.CurrentPoint, delta);
if (piece == null || king.IsFriendly(piece))
{
continue;
}
if (piece.CanMoveTo(king.CurrentPoint, board))
{
return(true);
}
}
return(false);
}