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How the simple chess.com elo algorithm can lead to very weird outcomes.

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catkeson

Here is the situation.  You agree to play a match against a higher rated opponent.  You play many games against your opponent keeping track of the score.  When the match is over, you have lost the match by a considerable margin but are now higher rated than your opponent.  Both of you have the same glicko rating so there is no weird rating stuff going on.  Is this possible??

 

On chess.com, this is possible!  I just played a 35 game match against an opponent who started off 50 points higher rated than me but ended up 20 points lower rated than me after winning the match 19-16.   The reason this can occur is because timing of when you win games is important.  If you win and lose most your games when your opponents rating is much higher than yours you will benefit from the favorable rating point outcomes.  My average loss in the match cost me 6.47 points while my average win netted me 9.47 points.

TameLava

That's kinda cool...