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Subject: Re: help needed about elo calculation

Author: Masciulli Gianluigi

Date: 10:20:35 02/29/00

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On February 29, 2000 at 12:48:07, Tony Hedlund wrote:

>On February 29, 2000 at 09:52:06, Masciulli Gianluigi wrote:
>
>tscp15's 90.2% against 1700 = 2062
>fortress161's 96.9% against 1700 = 2232
>golem01's 0% against 1700 is < 1000
>fortress16's 58.8% against tscp15 indicates a difference with 64 points,
>2179-2115.

thanks tony for your answer.

ok ... that's the easy part but ...
you see you listed frotress TWICE with perf. 2232 and 2179-2115.
I need the global performance.

>
>>One more: I'd like to have extimes about probability that performances match the
>>true elo on the base of games played (ssdf Like)... any matematician out there?
>
>This question I do not understand, sorry.

I'll try to explay this better:

if I play 1 billion game and the result between prog.A (elo ??)  and Prog.B ..
prog.C prog.D  (and all  have elo 2000) is esactly 50%
I can say that the elo of  prog A in that set of programs is almost esactly
2000.
but what about the same result after only 50 games.
may be there is some difference between elo and perf. in this case.
may be i can say, in this case that the  elo of the program A is 2000 with an
error margin of 50 point (in other words there is probability .9 that the true
elo is within the range 1950 -> 2050).
I want to calc the error margin.
I hope is clear now.

gianluigi



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