The rating in kdice is based on the ELO rating system which is also used for chess.

Basically you get a higher rating if you beat others with a high rating. This also means you lose more when you lose to people with low ratings.


So if you have a high rating you can gain more by playing other with high ratings. There are minimum 200 rating tables which will help you do this.


ELO on wikipedia:
http://en.wikipedia.org/wiki/ELO_rating_system