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It happened to me as well.. i was 1590, played against 1800.. and I won, his rating got reduced to around 1593.. i think thats how a elo rating works.. if u lose to u lower rated player after the game, ur rating will be considerably reduced..
it was a provisional rating if it changed that much
thank you
May 3, 2017
0
#5
The site uses the Glicko rating system which includes a Ratings Deviation value (RD) that is a measure of uncertainty. New members and members with very few games, have a high RD value and wins/losses can cause large swings in rating.
The site also allows new accounts to set a skill level, so it is very possible that they choose an inaccurate skill level and playing a few games will quickly put them closer to their true strength.
Glicko RD also has a time component. If a player doesn't have many recent games, the RD value will increase, again causing larger rating swings.
https://support.chess.com/customer/en/portal/articles/1444777-how-do-ratings-work-
I've played several times against players with ratings that decent and then after the game their rating shifts considerably lower. How and why would somebody camoflauge their rating?