def step_back(self):
        ''' Return to the previous state of the game

        Returns:
            (bool): True if the game steps back successfully
        '''
        if not self.history:
            return False
        self.dealer, self.players, self.round = self.history.pop()
        return True
 Return to the previous state of the game

        Returns:
            (bool): True if the game steps back successfully
        
rlcard/games/uno/game.py