private static void GetQueenCastlingPosition(ChessBoard board, char file, sbyte rank, List <ChessBoard> result, Square current)
{
ChessBoard tempboard;
if (BlackKing.IsSafe(board) && DefaultInfo.BlackKingIsUnMoved && DefaultInfo.BlackAsideRookIsUnMoved)
{
char rookfile = 'a';
for (char tfile = file; tfile > 'a'; tfile--)
{
if (board[tfile, rank] == (sbyte)DefaultPieces.BlackRook)
{
rookfile = tfile;
}
}
tempboard = board.ShallowCopy();
bool CastlingAvailable = true;
for (char tfile = file; tfile >= 'c'; tfile--)
{
if (board[tfile, rank] != 0 && board[tfile, rank] != (sbyte)DefaultPieces.BlackKing && board[tfile, rank] != (sbyte)DefaultPieces.BlackRook)
{
CastlingAvailable = false;
return;
}
}
for (char tfile = rookfile; tfile <= 'd'; tfile++)
{
if (board[tfile, rank] != 0 && board[tfile, rank] != (sbyte)DefaultPieces.BlackKing && board[tfile, rank] != (sbyte)DefaultPieces.BlackRook)
{
CastlingAvailable = false;
return;
}
}
for (char tfile = rookfile; tfile >= 'd'; tfile--)
{
if (board[tfile, rank] != 0 && board[tfile, rank] != (sbyte)DefaultPieces.BlackKing && board[tfile, rank] != (sbyte)DefaultPieces.BlackRook)
{
CastlingAvailable = false;
return;
}
}
for (char tfile = file; tfile >= 'c'; tfile--)
{
ChessBoard temp2board = Piece.PerformMove(board, current, new Square(tfile, rank));
if (!BlackKing.IsSafe(temp2board))
{
CastlingAvailable = false;
return;
}
}
if (file == 'b')
{
ChessBoard temp2board = Piece.PerformMove(board, current, new Square('c', rank));
if (!BlackKing.IsSafe(temp2board))
{
CastlingAvailable = false;
}
}
if (CastlingAvailable)
{
tempboard = Piece.PerformMove(board, current, new Square('c', rank));
tempboard = Piece.PerformMove(tempboard, new Square(rookfile, rank), new Square('d', rank));
result.Add(tempboard);
}
}
}