Hello World,
Something happened with my rating which I cannot understand. I gave a contest and my rating increased by +135 (1012 -> 1147). But in the next contest I performed poorly, and my rating decreased by -94 (1127 -> 1033). Yes, that's not a mistake, after giving the second contest, the rating change for previous contest changed to +115 (1012 -> 1127).
Can someone please explain why and how this happens?
What are the factors on which rating change for a contest is decided?
If you are Chinese. You can see sister ruler's blog.
https://www.luogu.com.cn/blog/ak-ioi/cf-at-rating
Thanks. It explains rating system but not how one's "rating changes" for previous contests change after later contests.
Your later contests don't affect the rating changes of previous contests. But rating changes from contests can change afterwards. This is because when ratings are updated after each contest, the leaderboard might contain cheaters. Later the admins remove cheaters from leaderboards and recalculate old rating changes.