public void UndoMove(Position from, Position to, Piece captured)
{
Piece p = this.Board.RemovePiece(to);
p.DecreaseMoveCounter();
if (captured != null)
{
this.Board.InsertPiece(captured, to);
this._captured.Remove(captured);
}
this.Board.InsertPiece(p, from);
/*** King-side castling ***/
if (p is King && to.Column == from.Column + 2)
{
Position fromR = new Position(from.Row, from.Column + 3);
Position toR = new Position(from.Row, from.Column + 1);
Piece R = this.Board.RemovePiece(toR);
R.DecreaseMoveCounter();
this.Board.InsertPiece(R, fromR);
}
/*** Queen-side castling ***/
if (p is King && to.Column == from.Column - 2)
{
Position fromR = new Position(from.Row, from.Column - 4);
Position toR = new Position(from.Row, from.Column - 1);
Piece R = this.Board.RemovePiece(toR);
R.DecreaseMoveCounter();
this.Board.InsertPiece(R, fromR);
}
/*** En Passant ***/
if (p is Pawn)
{
if (from.Column != to.Column && captured == this.EnPassant)
{
Piece pawn = this.Board.GetPiece(to);
Position posP;
if (p.Color == Color.White)
{
posP = new Position(3, to.Column);
}
else
{
posP = new Position(3, to.Column);
}
this.Board.InsertPiece(pawn, posP);
}
}
}
