@Yang1130,
You're welcome.
If I understand the rules right, "winning the rubber" should be a sizable advantage in winning the card game. It would entail winning two out of three rounds, and getting bonus points on top of that.
Victory might not be completely assured, because if your two victories were by a small margin and gained you only a few points, while your opponent's single victory was by a large margin and gained them a large amount of points, they might still win. But in most cases I would expect that winning the rubber would mean winning the game.