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Subject: Re: I will continue the match until there is a diffence of 7 games

Author: Severi Salminen

Date: 10:29:20 12/19/00

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>----------------------------------------------
>Reliability of chess matches (confidence: 80%)
>
> 10 games: 14.0% (105 pts)
> 20 games: 11.0% ( 77 pts)
> 30 games:  9.0% ( 63 pts)
> 40 games:  8.0% ( 56 pts)
> 50 games:  7.0% ( 49 pts)
>100 games:  5.0% ( 35 pts)
>200 games:  3.5% ( 25 pts)
>400 games:  2.5% ( 18 pts)
>600 games:  2.2% ( 15 pts)
>----------------------------------------------
>

Thanks, very clarifying! I hope everyone here would get familiar with these
numbers. Could you compile a list with maybe 3-5 reliability levels (80%, 90%,
95%, 99% and 99,5%...) and send it to whoever is the webmaster of CCC. I think
it would be a blessing (or probably not) for the chess community. It would
definitely not end these posts I mentioned, but people would know how to
interpret them.

>For 20 games, a 61% winning percentage is enough, with 80% confidence.
>
>That means that a result of 12.5-7.5 is already significant, with 80%
>confidence.

Ok. But I think that 80% is not enough. Usually 95% is considered "statistically
quite significant" and 99,5% "very significant" (or similar) in statistics. But
true, 20-0 tells a lot. Again, learning must be taken in consideration.

Severi



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