code: def zobrist_hash(board: chess.Board, *, _hasher: Callable[[chess.Board], int] = ZobristHasher(POLYGLOT_RANDOM_ARRAY)) -> int:
      
      return _hasher(board)
docs: Calculates the Polyglot Zobrist hash of the position.
  
      A Zobrist hash is an XOR of pseudo-random values picked from
      an array. Which values are picked is decided by features of the
      position, such as piece positions, castling rights and en passant
      squares.