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Subject: Re: the tortoise and the hare: yace versus rybka in endgame test

Author: Uri Blass

Date: 03:48:52 01/01/06

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On January 01, 2006 at 06:29:00, Joseph Ciarrochi wrote:

>Yace is reputed to be an excellent endgame engine and indeed beat a better
>engine (anmon) solidly (+6 after 40 games) in the endgame test
>
>yace is about 300 points weaker than rybka, so i thought it would be a great to
>see if it could upset this top engine.  Well , yace made a pretty good contest
>of it, but lost in the end. Yace had 9 wins, 14 losses, and 17 draws (40 min
>with 4 sec increment). Yace played much better than expected given the 300
>rating point disparity. Also, Rybka was getting between 2 to 5 play deaper than
>poor old yace, so it is pretty amazing that yace got 44% of the points

I think that even if you test Rybka against anmon you will not get 300 elo
difference.

It is known that part of the positions are unbalanced so I do not understand why
do you even try to do comprison between rating and results.

Note also that even in case that the positions are balanced you can expect
smaller difference relative to difference in real games because in most cases
the weaker engine does not get equal endgames in real games.

Uri



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