Yeah, there's also that. Me, for example: I'm stronger on the left, but I'm willing to go over to the right, and often I'm still stronger on the right than the person who doesn't want to move (even if I'm also stronger than that person on the left). Case in point, yesterday I was sweeping across from JF. It's just not worth making her move, you know? :-} But I think M's theory assumed very strong sweepers across the board, so that particular issue is less of a thing -- it began when she was talking about how she had to switch sides when she was playing lead for D and C, and that year the second was DM, who's a true left-hander.

Anyway. I do predict that I will be a (even) stronger sweeper when I get a new broom. [looks forward to happy future day]