// e2-e3
IEnumerable <FigureMove> NextPawnMove_Forward()
{
Coord to = new Coord(x, y + up);
if (board.IsEmpty(to))
{
yield return(new FigureMove(figureCoord, to));
}
}
IEnumerable <FigureMove> NextKnightMove_Steps()
{
ColorType other = figureCoord.figure.GetColor().Swap();
int[,] KnightSteps =
{
{ -1, -2 }, { +1, -2 },
{ -2, -1 }, { +2, -1 },
{ -2, +1 }, { +2, +1 },
{ -1, +2 }, { +1, +2 }
};
FigureMove figureMove = new FigureMove(figureCoord);
for (int j = 0; j < 8; j++)
{
if (figureCoord.coord.Shift(KnightSteps[j, 0],
KnightSteps[j, 1],
out figureMove.to))
{
if (board.IsEmpty(figureMove.to))
{
yield return(figureMove);
}
else if (board.IsColor(figureMove.to, other))
{
yield return(figureMove);
}
}
}
}
IEnumerable <FigureMove> NextKingMove_Steps()
{
FigureMove figureMove = new FigureMove(figureCoord);
ColorType otherColor = figureCoord.figure.GetColor().Swap();
int[,] KingSteps =
{
{ -1, -1 }, { -1, 0 }, { -1, +1 },
{ 0, -1 }, { 0, +1 },
{ +1, -1 }, { +1, 0 }, { +1, +1 }
};
for (int j = 0; j < 8; j++)
{
if (figureCoord.coord.Shift(KingSteps[j, 0],
KingSteps[j, 1],
out figureMove.to))
{
if (board.IsEmpty(figureMove.to))
{
yield return(figureMove);
}
else if (board.IsColor(figureMove.to, otherColor))
{
yield return(figureMove);
}
}
}
}