docs: def move(self):
          """
          Advance game by single move, if possible.
  
          @return: logical indicator if move was performed.
          """
          if len(self.moves) == MAX_MOVES:
              return False
          elif len(self.moves) % 2:
              active_engine = self.black_engine
              active_engine_name = self.black
              inactive_engine = self.white_engine
              inactive_engine_name = self.white
          else:
              active_engine = self.white_engine
              active_engine_name = self.white
              inactive_engine = self.black_engine
              inactive_engine_name = self.black
          active_engine.setposition(self.moves)
          movedict = active_engine.bestmove()
          bestmove = movedict.get('move')
          info = movedict.get('info')
          ponder = movedict.get('ponder')
          self.moves.append(bestmove)
  
          if info["score"]["eval"] == "mate":
              matenum = info["score"]["value"]
              if matenum > 0:
                  self.winner_engine = active_engine
                  self.winner = active_engine_name
              elif matenum < 0:
                  self.winner_engine = inactive_engine
                  self.winner = inactive_engine_name
              return False
  
          if ponder != '(none)':
              return True