public void UnapplyMove(Move move)
{
Square pawn = Squares[move.To.X, move.To.Y];
Color pawnColor = pawn.Color;
#if DEBUG
if (pawnColor == Color.None)
{
Console.WriteLine("Invalid move");
return;
}
#endif
if (move.IsEpCapture)
{
Square to = move.To;
int toX = to.X;
int toY = to.Y;
if (pawnColor == Color.Black)
{
Square tPawn = Squares[toX, toY + 1];
tPawn.Color = Color.White;
WhitePawns.Add(tPawn);
BlackPawns.Remove(pawn);
pawn.Color = Color.None;
}
else
{
Square tPawn = Squares[toX, toY - 1];
tPawn.Color = Color.Black;
BlackPawns.Add(tPawn);
WhitePawns.Remove(pawn);
pawn.Color = Color.None;
}
}
else if (move.IsCapture)
{
if (pawnColor == Color.White)
{
pawn.Color = Color.Black;
BlackPawns.Add(pawn);
WhitePawns.Remove(pawn);
}
else
{
pawn.Color = Color.White;
WhitePawns.Add(pawn);
BlackPawns.Remove(pawn);
}
}
else
{
RemovePawn(pawn);
pawn.Color = Color.None;
}
Square from = move.From;
from.Color = pawnColor;
AddPawn(from);
}
private void RemovePawn(Square pawn)
{
if (pawn.Color == Color.White)
{
WhitePawns.Remove(pawn);
}
else
{
BlackPawns.Remove(pawn);
}
}