Originally posted by VartiovuoriYou're thinking of the old formula. RHP's is a bit different. But even under the old formula, negative ratings are possible if you have enough people who are rated low enough.
Well, I have bad news for you. I'm pretty sure your rating can never be more than 400 points below the weakest opponent you have played, so at the moment it's not possible to hit 0 or go below it.