private void RemovePiece(int ix, Color color, PieceType pieceType)
{
Debug.Assert(_squares[ix] == new Piece(color, pieceType));
_pieceBitboards[PieceBitboardIndex(color, pieceType)] &= ~ValueFromIx(ix);
_squares[ix] = Piece.None;
ZobristHash ^= ZobristHashing.CalculatePieceBitboardHashDiff(ValueFromIx(ix), color, pieceType);
// TODO: material hash update
// TODO: pawn hash update
}
private void MovePiece(int srcIx, int dstIx, Color color, PieceType pieceType)
{
Debug.Assert(_squares[srcIx] == new Piece(color, pieceType));
Debug.Assert(_squares[dstIx].PieceType == PieceType.None);
_pieceBitboards[PieceBitboardIndex(color, pieceType)] &= ~ValueFromIx(srcIx);
_pieceBitboards[PieceBitboardIndex(color, pieceType)] |= ValueFromIx(dstIx);
_squares[srcIx] = Piece.None;
_squares[dstIx] = new Piece(color, pieceType);
ZobristHash ^= ZobristHashing.CalculatePieceBitboardHashDiff(
ValueFromIx(srcIx) | ValueFromIx(dstIx),
color,
pieceType);
// No material hash update needed
// TODO: pawn hash update
}
