Is there a good reference for stats about professional game scores?

Like mean difference between winner and loser. Mean winning score, mean losing sore, along with variance.

I also would be satisfied with a list of scores to do my own stats, though parsing through a bunch of files might be a little out of the way.

Have you heard of GoGod? www.gogod.co.uk

Most games that would have ended by a difference of more than a couple points end by resignation instead.