You want to click on the only glued topic in the General Forums. How did you miss it?
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https://www.chess.com/forum/view/general/chess-rating-system
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Have a nice read!
Can someone explain to me what happened when I played someone with a 1170 rating and I had a 1147 rating and after losing my rating went from 1147 to 910. I have since brought it back up to 970.