Uniformly selects a random entry for the given position.

        :raises: :exc:`IndexError` if no entries are found.

def choice(self, board: Union[chess.Board, int], *, minimum_weight: int = 1, exclude_moves: Container[chess.Move] = (), random=random) -> Entry:
        """
        Uniformly selects a random entry for the given position.

        :raises: :exc:`IndexError` if no entries are found.
        """
        chosen_entry = None

        for i, entry in enumerate(self.find_all(board, minimum_weight=minimum_weight, exclude_moves=exclude_moves)):
            if chosen_entry is None or random.randint(0, i) == i:
                chosen_entry = entry

        if chosen_entry is None:
            raise IndexError()

        return chosen_entry