protected override int OnGetBlockingMoves(int start, int[] moves, int[] ray, int rayLen)
{
int begin = start;
if ((PinStatus == PinStatus.None || (PinStatus & PinStatus.NS) != 0))
{
for (int i = 0; i < rayLen; ++i)
{
int square = ray[i];
if (square - HomeSquare == oneStep)
{
moves[start++] = MovePackHelper.Pack(HomeSquare, square);
if (Square.Rank(square) == lastRank)
{
int prom = moves[start - 1];
moves[start - 1] |= MovePackHelper.GetPromotionMerge(PromotionTo.Queen);
moves[start++] = prom | MovePackHelper.GetPromotionMerge(PromotionTo.Bishop);
moves[start++] = prom | MovePackHelper.GetPromotionMerge(PromotionTo.Rook);
moves[start++] = prom | MovePackHelper.GetPromotionMerge(PromotionTo.Knight);
}
}
if (Square.Rank(HomeSquare) == rankForEp && board.BoardArray[HomeSquare + oneStep] == null && square - HomeSquare == twoStep)
{
moves[start] = MovePackHelper.Pack(HomeSquare, square);
MovePackHelper.GetCleanedMove(moves[start]);
start++;
}
}
}
return(start - begin);
}
protected override int OnGetCaptureMoves(int start, int[] moves, int square)
{
int begin = start;
if ((square - HomeSquare == diag1 || square - HomeSquare == diag2) &&
IsEnemy(square) && PinCompatible(square - HomeSquare)
)
{
moves[start++] = MovePackHelper.Pack(this, board.BoardArray[square]);
if (Square.Rank(square) == lastRank)
{
int prom = moves[start - 1];
moves[start - 1] |= MovePackHelper.GetPromotionMerge(PromotionTo.Queen);
moves[start++] = prom | MovePackHelper.GetPromotionMerge(PromotionTo.Bishop);
moves[start++] = prom | MovePackHelper.GetPromotionMerge(PromotionTo.Rook);
moves[start++] = prom | MovePackHelper.GetPromotionMerge(PromotionTo.Knight);
}
}
// ep.
if (Square.Rank(HomeSquare) == rankForEpCapture)
{
if (HomeSquare + diag2 - oneStep == square) // THE CAPTURED ep is the target square
{
if (Square.SquareValid(HomeSquare + diag2) && HomeSquare + diag2 == board.EnPassant && PinCompatible(diag2) && board.CheckIfSafeEpCapture(Owner, HomeSquare))
{
moves[start++] = MovePackHelper.Pack(HomeSquare, HomeSquare + diag2) | MovePackHelper.EpFlag;
}
}
if (HomeSquare + diag1 - oneStep == square) // THE CAPTURED ep is the target square
{
if (Square.SquareValid(HomeSquare + diag1) && HomeSquare + diag1 == board.EnPassant && PinCompatible(diag1) && board.CheckIfSafeEpCapture(Owner, HomeSquare))
{
moves[start++] = MovePackHelper.Pack(HomeSquare, HomeSquare + diag1) | MovePackHelper.EpFlag;
}
}
}
return(start - begin);
}
protected override int OnGetMoves(int start, int[] moves)
{
int begin = start;
if (Square.Rank(HomeSquare) != lastRank && board.BoardArray[HomeSquare + oneStep] == null && (PinStatus == PinStatus.None || (PinStatus & PinStatus.NS) != 0))
{
moves[start++] = MovePackHelper.Pack(HomeSquare, HomeSquare + oneStep);
if (Square.Rank(HomeSquare + oneStep) == lastRank)
{
int prom = moves[start - 1];
moves[start - 1] |= MovePackHelper.GetPromotionMerge(PromotionTo.Queen);
moves[start++] = prom | MovePackHelper.GetPromotionMerge(PromotionTo.Bishop);
moves[start++] = prom | MovePackHelper.GetPromotionMerge(PromotionTo.Rook);
moves[start++] = prom | MovePackHelper.GetPromotionMerge(PromotionTo.Knight);
}
if (Square.Rank(HomeSquare) == rankForEp && board.BoardArray[HomeSquare + twoStep] == null)
{
moves[start] = MovePackHelper.Pack(HomeSquare, HomeSquare + twoStep);
MovePackHelper.GetCleanedMove(moves[start]);
start++;
}
}
if (Square.Rank(HomeSquare) != lastRank)
{
if (PinStatus == PinStatus.None || (PinStatus & PinStatus.NS) == 0)
{
if (Square.SquareValid(HomeSquare + diag1) && IsEnemy(HomeSquare + diag1) && PinCompatible(diag1))
{
moves[start++] = MovePackHelper.Pack(this, board.BoardArray[HomeSquare + diag1]);
if (Square.Rank(HomeSquare + diag1) == lastRank)
{
int prom = moves[start - 1];
moves[start - 1] |= MovePackHelper.GetPromotionMerge(PromotionTo.Queen);
moves[start++] = prom | MovePackHelper.GetPromotionMerge(PromotionTo.Bishop);
moves[start++] = prom | MovePackHelper.GetPromotionMerge(PromotionTo.Rook);
moves[start++] = prom | MovePackHelper.GetPromotionMerge(PromotionTo.Knight);
}
}
if (Square.SquareValid(HomeSquare + diag2) && IsEnemy(HomeSquare + diag2) && PinCompatible(diag2))
{
moves[start++] = MovePackHelper.Pack(this, board.BoardArray[HomeSquare + diag2]);
if (Square.Rank(HomeSquare + diag2) == lastRank)
{
int prom = moves[start - 1];
moves[start - 1] |= MovePackHelper.GetPromotionMerge(PromotionTo.Queen);
moves[start++] = prom | MovePackHelper.GetPromotionMerge(PromotionTo.Bishop);
moves[start++] = prom | MovePackHelper.GetPromotionMerge(PromotionTo.Rook);
moves[start++] = prom | MovePackHelper.GetPromotionMerge(PromotionTo.Knight);
}
}
// ep.
if (Square.Rank(HomeSquare) == rankForEpCapture)
{
if (Square.SquareValid(HomeSquare + diag2) && HomeSquare + diag2 == board.EnPassant && PinCompatible(diag2) && board.CheckIfSafeEpCapture(Owner, HomeSquare))
{
moves[start++] = MovePackHelper.Pack(HomeSquare, HomeSquare + diag2) | MovePackHelper.EpFlag;
}
if (Square.SquareValid(HomeSquare + diag1) && HomeSquare + diag1 == board.EnPassant && PinCompatible(diag1) && board.CheckIfSafeEpCapture(Owner, HomeSquare))
{
moves[start++] = MovePackHelper.Pack(HomeSquare, HomeSquare + diag1) | MovePackHelper.EpFlag;
}
}
}
}
return(start - begin);
}