public bool CanMove(FigureMoving fm)
{
this.fm = fm;
return(CanMoveFrom() &&
CanMoveTo() &&
CanFigureMove());
}
void EnPassantAttack(FigureMoving fm)
{
Square midSquare = new Square(enPassant);
Figure pawn = moveColor == Color.white ? Figure.whitePawn : Figure.blackPawn;
if (fm.to == midSquare && fm.figure == pawn)// en passant
{
InsertFigure(new Square(midSquare.x, fm.from.y), Figure.none);
}
}
void SetEnPassant(FigureMoving fm)
{
if (fm.figure == Figure.whitePawn || fm.figure == Figure.blackPawn)
{
if (fm.AbsDeltaY == 2)// jump is only possible if a pawn moves from Y:1 or Y:6
{
int y = fm.to.y - fm.SignDeltaY;
Square midSquare = new Square(fm.to.x, y);
enPassant = midSquare.ToString();
return;
}
}
enPassant = "-";// en passant only has power during one move
}
void MoveCastleRook(FigureMoving fm)
{
if ((fm.figure == Figure.whiteKing || fm.figure == Figure.blackKing) &&
fm.AbsDeltaX == 2 && fm.AbsDeltaY == 0)
{
Figure rook = fm.figure == Figure.whiteKing ? Figure.whiteRook : Figure.blackRook;
if (fm.SignDeltaX == 1)// kingside castle
{
InsertFigure(new Square(7, fm.from.y), Figure.none);
InsertFigure(new Square(fm.to.x + (fm.SignDeltaX * -1), fm.to.y), rook);
}
else if (fm.SignDeltaX == -1)// queenside castle
{
InsertFigure(new Square(0, fm.from.y), Figure.none);
InsertFigure(new Square(fm.to.x + (fm.SignDeltaX * -1), fm.to.y), rook);
}
}
}
void UpdateCastleFlags(FigureMoving fm)
{
// we move our king or rook
Figure king = moveColor == Color.white ? Figure.whiteKing : Figure.blackKing;
Figure rook = moveColor == Color.white ? Figure.whiteRook : Figure.blackRook;
if (fm.figure == king)
{
DisableQueensideCastle(moveColor);
DisableKingsideCastle(moveColor);
}
else if (fm.figure == rook)
{
if (fm.from.x == 0)
{
DisableQueensideCastle(moveColor);
}
else if (fm.from.x == 7)
{
DisableKingsideCastle(moveColor);
}
}
}
public Board Move(FigureMoving fm)
{
Board nextBoard = new Board(fen);
nextBoard.InsertFigure(fm.from, Figure.none);
nextBoard.InsertFigure(fm.to, fm.promotion == Figure.none ? fm.figure : fm.promotion);
nextBoard.EnPassantAttack(fm);
nextBoard.SetEnPassant(fm);
nextBoard.MoveCastleRook(fm);
nextBoard.UpdateCastleFlags(fm);
if (moveColor == Color.black)
{
nextBoard.moveNumber++;
}
nextBoard.moveColor = moveColor.FlipColor(); // end of the move
nextBoard.GenerateFen(); //apply the move to current board state
return(nextBoard);
}
public bool IsCheckAfterMove(FigureMoving fm)
{
Board afterBoard = Move(fm);
return(afterBoard.CanAttackEnemyKing());
}
