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);
}
}
}
}
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> NextPawnMove_Promotion(FigureMove move)
{
if (y == promoY)
{
move.is_promotion = true;
for (FigureType promo = promoFr; promo <= promoTo; promo++)
{
move.promotion = promo;
yield return(move);
}
}
else
{
yield return(move);
}
}
// e2-e4
IEnumerable <FigureMove> NextPawnMove_Double()
{
if (y == y1)
{
Coord to1 = new Coord(x, y2);
Coord to2 = new Coord(x, y3);
if (board.IsEmpty(to1))
{
if (board.IsEmpty(to2))
{
FigureMove move = new FigureMove(figureCoord, to2);
move.is_enpassant = true;
move.enpassant = new Coord(x, y2);
yield return(move);
}
}
}
}
public void MakeMove(FigureMove move)
{
ulong to = move.to.GetBit();
bits[(int)move.figure.figure] &= ~move.figure.coord.GetBit();
for (int j = 0; j < 12; j++)
{
bits[j] &= ~to;
}
if (move.is_promotion)
{
bits[(int)move.promotion] |= to;
}
else
{
bits[(int)move.figure.figure] |= to;
}
}
IEnumerable <FigureMove> NextWhitePawnMove(FigureCoord figureCoord)
{
figureCoord.coord.extract(out int x, out int y);
ulong bit = figureCoord.coord.GetBit();
ulong owned = board.GetOwnedBits();
if (0 == (owned & (bit << 8)))
{
if (y < 6)
{
yield return(new FigureMove(figureCoord, new Coord((byte)(figureCoord.coord.xy + 8))));
}
else
{
for (FigureType promo = FigureType.wKnight; promo <= FigureType.wQueen; promo++)
{
FigureMove move = new FigureMove(figureCoord, new Coord((byte)(figureCoord.coord.xy + 8)));
move.is_promotion = true;
move.promotion = promo;
yield return(move);
}
}
}
if (y == 1)
{
if (0 == (owned & (bit << 8)))
{
if (0 == (owned & (bit << 16)))
{
FigureMove move = new FigureMove(figureCoord, new Coord((byte)(figureCoord.coord.xy + 16)));
move.is_enpassant = true;
move.enpassant = new Coord(x, y + 1);
}
}
}
}
public static string Print(this FigureMove move)
{
return(move.figure.figure + " " + move.figure.coord.Print() +
(move.figure.coord == move.to ? "" : "-" + move.to.Print()) +
(move.is_promotion ? " " + move.promotion : ""));
}