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Subject: Re: Different Hydra personalities against Rybka

Author: Bernhard Bauer

Date: 00:43:05 12/13/05

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Currently the strongest available chess device is Hydra.
So it's quite naturally to tune against it.
I use for example the Adams-Hydra games to do some tuning.
BTW thank you for your very informative article "Desi-Party" in Kaissiber 21.
I enjoyed it very much.
Kind regards
Bernhard

On December 13, 2005 at 02:16:50, Chrilly Donninger wrote:

>I experimented recently with a Shredder-style search in Hydra. The
>single-processor Shredder/Hydra completly demolished Shredder. If two programs
>are similar, the strength difference is enlarged. Its therefore a bad idea to
>tune a programme against itself.
>But the Shredder/Hydra made only 40% against Rybka. Changing back to the
>standard Hydra-search its between 75-80%. Rybka is regularily "killed" in
>king-attacks. As noted before, this numbers are for Hydra-single-processor. The
>PC-programm is running on a 3.2 MHz Pentium 4. Time control is 30secs/move. A
>standard-opening set similar to the Nunn-openings is used.
>
>Changing the search is not only a tactical matter. The playing style is to a
>large extend also influenced by the search. If two moves are from the evaluation
>point similar, the programm usually plays the one with the larger search tree.
>Or in other words: The lines which are extended. The Shredder/Hydra played
>over-aggressive, whereas the classical Hydra with the right dose.
>
>One conclusion of my experiment is: Rybka seems to be fairly tuned against
>Shredder. This is always the fate of the leader of the gang. In the future other
>programs will be tuned against Rybka and it will be much more difficult to stay
>on the top.
>
>The experiment shows also, that it is fairly easy to tune against one programm.
>The problem is to find a solution which works against all.
>
>Chrilly



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