Here's a link to previous threads on the rating system they use. Basically in the beginning it bounces up and down like someone on a trampoline. After a hundred or so games it's more like an old man snoozing in a hammock.
http://www.chess.com/forum/search?keyword=Glicko+RD
i was wondering how this website calculates my rating im starting out with a rating of: 1200 but now its something about 600. how do they calculate my rating and get to the conclusion of my current rating? Thanks in advance :)