Good idea. However, I think that the groups should stay the same, but a beginner can challenge an intermediate, and an intermediate can challenge an experienced or vice versa. If a lower category beats a higher category it is the same as two wins for themselves, and the higher person not only doesn't gain a win, but gets two added on to his losses. However, if the higher category wins. it is just the same as usual. Hope you understand, what do you think?