public void AddPiece(Piece pc, Square sq)
{
_pieces[sq.AsInt()] = pc;
_byType[PieceTypes.AllPieces.AsInt()] |= sq;
_byType[pc.Type().AsInt()] |= sq;
_bySide[pc.ColorOf().Side] |= sq;
_index[sq.AsInt()] = _pieceCount[pc.AsInt()]++;
_pieceList[pc.AsInt()][_index[sq.AsInt()]] = sq;
_pieceCount[PieceTypes.AllPieces.MakePiece(pc.ColorOf()).AsInt()]++;
}
private static bool CountPieceValidity(ReadOnlySpan <char> s)
{
var spaceIndex = s.IndexOf(Space);
if (spaceIndex == -1)
{
throw new InvalidFen($"Invalid fen {s.ToString()}");
}
var mainSection = s.Slice(0, spaceIndex);
Span <int> limits = stackalloc int[] { 32, 8, 10, 10, 10, 9, 1 };
// piece count storage, using index 0 = '/' count
Span <int> pieceCount = stackalloc int[(int)Pieces.PieceNb];
foreach (var t in mainSection)
{
if (t == '/')
{
if (++pieceCount[0] > SeparatorCount)
{
throw new InvalidFen($"Invalid fen (too many separators) {s.ToString()}");
}
continue;
}
if (char.IsNumber(t))
{
if (!t.InBetween('1', '8'))
{
throw new InvalidFen($"Invalid fen (not a valid square jump) {s.ToString()}");
}
continue;
}
var pieceIndex = PieceExtensions.PieceChars.IndexOf(t);
if (pieceIndex == -1)
{
throw new InvalidFen($"Invalid fen (unknown piece) {s.ToString()}");
}
var pc = new Piece((Pieces)pieceIndex);
var pt = pc.Type();
pieceCount[pc.AsInt()]++;
var limit = limits[pt.AsInt()];
if (pieceCount[pc.AsInt()] > limit)
{
throw new InvalidFen($"Invalid fen (piece limit exceeded for {pc}) {s.ToString()}");
}
}
public void RemovePiece(Square square, Piece piece)
{
var invertedSq = ~square;
BoardPieces[piece.AsInt()] &= invertedSq;
OccupiedBySide[piece.ColorOf()] &= invertedSq;
BoardLayout[square.AsInt()] = PieceExtensions.EmptyPiece;
if (IsProbing)
{
return;
}
PieceUpdated?.Invoke(EPieces.NoPiece, square);
}
public void AddPiece(Piece piece, Square square)
{
BitBoard bbsq = square;
var color = piece.ColorOf();
BoardPieces[piece.AsInt()] |= bbsq;
OccupiedBySide[color] |= bbsq;
BoardLayout[square.AsInt()] = piece;
if (!IsProbing)
{
PieceUpdated?.Invoke(piece, square);
}
}
public static ulong GetZobristPst(this Piece piece, Square square) => ZobristPst[piece.AsInt()][square.AsInt()];
public BitBoard Pieces(Piece pc) => BoardPieces[pc.AsInt()];