Yes, this is what I meant. Jungleboy and Dan understood it. "Career Score Differential" is the term I should have used to avoid confusion. Sorry about that.
Oops. My mistake. I was trying to interpret your idea as a possible solution or alternative to a positive point differential requirement.
In any case, in the big picture, and because it's all in good fun, as long as we're not talking about this being tagged to the profile or avatar display or being displayed in any public way I don't have a grand problem with whatever the requirements might be as long as there is a consensus. You could say "you must win a game by 1 point, while babysitting your granddaughter on a Wednesday, while your opponent plays using your favorite color on a Thursday, with mismatched socks", for example...and I would be ok with that.