private (bool Castled, string Error) CastleQueenSide(Board.Board board)
{
KeyValuePair <int, int> rookPos, rookMove, kingMove;
if (this.Color == PieceColorEnum.Black)
{
rookPos = board.ConvertNotationForMove("a8");
rookMove = board.ConvertNotationForMove("d8");
kingMove = board.ConvertNotationForMove("c8");
}
else
{
rookPos = board.ConvertNotationForMove("a1");
rookMove = board.ConvertNotationForMove("d1");
kingMove = board.ConvertNotationForMove("c1");
}
// can't castle if it puts in check. run a simulation
King kingCopy = (King)board.DeepClone(this);
Board.Board simBoard = (Board.Board)board.DeepClone(board);
simBoard.MovePiece(kingCopy, kingMove.Key, kingMove.Value);
if (!kingCopy.IsInCheck(simBoard))
{
return(false, "castling results in a check");
}
// castle
Rook rook = (Rook)board.Instance[rookPos.Key, rookPos.Value];
board.MovePiece(rook, rookMove.Key, rookMove.Value);
board.MovePiece(this, kingMove.Key, kingMove.Value);
return(true, string.Empty);
}
private (bool CanCastle, string Error) CanCastleQueenSide(Board.Board board)
{
var rookPos = this.Color == PieceColorEnum.Black ? board.ConvertNotationForMove("a8") : board.ConvertNotationForMove("a1");
IPiece rookSpot = board.Instance[rookPos.Key, rookPos.Value];
if (rookSpot != null && rookSpot.Type == PieceTypeEnum.Rook && rookSpot.Color == this.Color)
{
var rook = (Rook)rookSpot;
if (!rook.HasMoved)
{
// check the spots that must be empty in order to castle
string[] spotsToCheck = this.Color == PieceColorEnum.Black ? new string[] { "b8", "c8, d8" } : new string[] { "b1", "c1", "d1" };
foreach (string spotToCheck in spotsToCheck)
{
var posToCheck = board.ConvertNotationForMove(spotToCheck);
if (board.Instance[posToCheck.Key, posToCheck.Value] != null)
{
return(false, $"spot {spotToCheck} has a piece");
}
}
return(true, string.Empty);
}
else
{
return(false, "rook has moved");
}
}
else if (rookSpot == null)
{
return(false, "the queenside rook isn't in its place");
}
else
{
return(false, "the queenside rook spot is taken");
}
}