def move_exists(b):
    """
    Check whether or not a move exists on the board
    Args: b (list) two dimensional board to merge
    Returns: list
    >>> b = [[1, 2, 3, 4], [5, 6, 7, 8]]
    >>> move_exists(b)
    False
    >>> move_exists(test)
    True
    """
    for row in b:
        for x, y in zip(row[:-1], row[1:]):
            if x == y or x == 0 or y == 0:
                return True
    return False