So your opponent thinks there's only one explanation for one of your ratings to be 300 points higher than the others? Give me a break!
If you look at my profile, you'll see that my online rating is hundreds of points higher than my standard and blitz. Why? Well, I STINK at blitz. With relatively little natural talent, I just don't think that fast. I'm not strong on standard because I hardly play standard at all. And I'm pretty good at online because, given the time to think, analyze, and move the pieces around, I think pretty well--apparently.
Your accuser is an idiot.
@OP: Cheating should be discussed only in the Cheating Forum, and not in the main forums. Please continue this discussion there.