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Subject: Re: Surak's Tourney: Differences EloStat vs. Fritz calculation

Author: Günther Simon

Date: 00:16:47 08/08/03

Go up one level in this thread


On August 08, 2003 at 02:04:48, Axel Schumacher wrote:

>Example:
>EloStat, some of the lower ranked engines:
>728 Yawce 0.16                     : 1962   58  33   263    31.9 %   2094    6.8
>%
>733 Raffaela                       : 1951   78  46   130    30.0 %   2098   12.3
>%
>736 Nero 5.3                       : 1934  114  60    81    30.2 %   2079    1.2
>%
>755 Pierre 1.7                     : 1861   60  30   290    30.2 %   2007    3.8
>%
>773 ROBOKewlper 0.047              : 1778  143  55    71    15.5 %   2073   14.1
>%
>775 Bigbook 3.1                    : 1765   48  24   443    28.0 %   1929    9.5
>%
>781 König Schwarz                  : 1717   53  42   182    36.0 %   1817   20.3
>%
>787 Kace 0.8                       : 1643  123  75    47    22.3 %   1860   23.4
>%
>
>and the same with Fritz (even much higher values):
>
>	Yawce 0.16	2080	262
>	Nero 5.3	2073	79
>	Raffaela	2064	130
>	Pierre 1.7	1983	288
>	Bigbook 3.1	1902	441
>	ROBOKewlper 0.047	1898	69
>	König Schwarz	1880	182
>	Kace 0.8	1805	47
>
>
>Axel

I dont know how your tournaments are structured, but you should
take care about having pools of players which are in a not to
distant range of Elo.
You should consider to make leagues or do some swiss tourneys.

What would happen, if you won't calculate all games between
players which differ by more than 400 Elo?

From the above ratings I can give you an example, why it
does not work as it should, even with EloStat.
I can see that Raffaela has a 30% score and a rating of 1951,
(in reality it is hardly over 1500)
imagine Raffaela had played 70x versus Fritz 8 and 30x
against Kace (assume it wins all versus Kace(what I doubt)
and loses all games versus Fritz8), it would get a highly
inflated rating, which would influence also all other
(in reality) weak opponents of Raffaela etc...

Regards,
Günther



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