https://support.chess.com/customer/en/portal/articles/1444777-how-do-ratings-work-
How are the scores calculated?
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I'm interested as to how win/loss/draw scores (eg. +8 W / 0 D / -8 L or +12 W / +2 D / -5 L) are decided. Is it just a difference or quotient of the players' ratings? Or is there more to it??