At the moment we are testing a small change in the session-rating calculation. These changes should stop the 'noob-bashing' practised by skilled player because we won't support such behaviour with good ratings. We took notice of this phenomenon especially in combination with 2.55 servers and relating to this issue there have been some discerning posts in the forum. We decided against an additional handling of the 2.55 servers or even an exclusion because we do not want to censor or intervent in the rating. Same calculation for all is our motto. That is why these changes are active for all servers, whereas 2.55 servers should be mainly affected which attracted our attention making 'noob-bashing' possible.
P.S.: 99,9% of all players should not be concerned by the changes.