Author: Peter Fendrich
Date: 10:58:43 05/22/99
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On May 22, 1999 at 12:53:55, Stefan Meyer-Kahlen wrote: >Just two questions concerning ELO performance and probabilities: > >* How do I calculate my ELO performance if I get x percent out of y games >against an opponent with z ELO points? > >* In which range is my own ELO rating with 95% probability after that match? > >I guess those are FAQs with 95% probability :-) > >Thanks > Stefan ELO is about rating difference and not the actual ELO rating. The performance formula is: Rp = Rc + D(P) where Rp is your rating before the match, Rc is your opponents rating before the match and P is the percent score (in your case=x). D(P) is the rating difference that P indicates. That means that P indicates what rating difference would be excpected with such a result. It is possible to compute D(P) with the help of a Bell curve but the easy way is a lookup table. Give me an email and I will give you the table or the formula whatever you like. //Peter
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