public override MovementResult IsLegalMove(int newX, int newY)
{
if (!ChessBoard.IsLegalBoardPosition(newX, newY))
{
return new MovementResult()
{
WasSuccessful = false,
ReasonForFailure = "That board position does not exist."
}
}
;
if (ChessBoard.IsPieceAt(newX, newY))
{
if (ChessBoard.PieceAt(newX, newY).PieceColor == PieceColor.White)
{
return new MovementResult()
{
WasSuccessful = false,
ReasonForFailure = "There is a friendly piece at that position."
}
}
}
;
if ((newX == XCoordinate && newY == YCoordinate + 1) && !ChessBoard.IsPieceAt(newX, newY))
{
var movementResult = new MovementResult()
{
WasSuccessful = true,
ReasonForFailure = ""
};
if (newY == 7)
{
movementResult.Flags.Add(Flag.PawnPromotion);
}
return(movementResult);
}
if ((newX == XCoordinate && newY == YCoordinate + 2) &&
!ChessBoard.IsPieceAt(XCoordinate, YCoordinate + 1) &&
!ChessBoard.IsPieceAt(XCoordinate, YCoordinate + 2) &&
!HasMoved)
{
HasDoubleSteppedLastTurn = true;
return(new MovementResult()
{
WasSuccessful = true,
ReasonForFailure = ""
});
}
if ((newX == XCoordinate - 1 || newX == XCoordinate + 1) && newY == YCoordinate + 1)
{
if (ChessBoard.IsPieceAt(newX, newY))
{
return new MovementResult()
{
WasSuccessful = true,
ReasonForFailure = ""
}
}
;
else if (ChessBoard.IsPieceAt(newX, newY - 1))
{
var piece = ChessBoard.PieceAt(newX, newY - 1);
if (piece is BlackPawn)
{
var pawn = (BlackPawn)piece;
if (pawn.HasDoubleSteppedLastTurn)
{
ChessBoard.EnPassantKill(pawn);
return(new MovementResult()
{
WasSuccessful = true,
ReasonForFailure = ""
});
}
}
}
}
return(new MovementResult()
{
WasSuccessful = false,
ReasonForFailure = "That was not a valid move for this piece."
});
}
}
