mctrivia: How many games constitutes rated really? There is a guy on top of the Dark Chess list after 4 games and a rating above 2100, yet he beat players rated only 1200 - 1600 in that time. Playing him would be a good way to boost ratings but it wouldn't be fair.

Perhaps any game against a player without an established rating wouldn't count?

Instead there should be a weighting where the less established the opponents rating, the less effect the result has on yours.