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### Subject: Re: ELO performance?

Author: Eelco de Groot

Date: 16:03:25 05/22/99

Go up one level in this thread

On May 22, 1999 at 14:34:12, Andrew Dados wrote:
>
>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
>
>
> Quick (and dirty) formula for perf. rating against player rated X :
>
> p.r= X+400*(W-L)/T;
>where W,L,T being wins,loses and total games respectively...
> Andrew
For an even rougher mental approximation I always use '7 points per %', so for
instance ELO performance = 7(x%-50%) + z. Only works well if x is not to far
from 50%.

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