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Subject: Re: Different Hydra personalities against Rybka

Author: Chrilly Donninger

Date: 03:01:45 12/13/05

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>
>
>Hi Chrilly,
>
>I find that hard to believe. One setting scores 40% against Rybka and another
>75-80% but at the same time the latter scores less against Shredder? You did not
>wrote by how much the more selective search scores better against Shredder but
>nevertheless in my tests I never experienced something like that.
>
>I often experience the same like Vas, that a tuning shows significant
>improvement in selfplay but no significance against a broad range of opponents.
>But I never observed that something which helped in selfplay hurts against other
>engines. It may be without effect against others but not worse.
>
>So far I was never able to tune Fruit against a specific opponent which resulted
>in a signficant difference not to say in doubling the score (40% to 80%). So
>either I simply lack the understanding how to do this or you played not enough
>games to get a statistical significant result and observed just noise. Given the
>little time between your first post about Rybka and this one I give both
>possibilities the same probability. ;-)
>
>regards
>
>Joachim
>
One explanation could be: As a tester you can only change some settings. But I
changed the search on the software-side almost completly. It was additionally
tuned against Shredder to play very aggressive. This worked quite good and gave
>80% against Shredder. The standard-version is - on a single - 70-75%.
Against Rybka this over-aggressive style did not work properly. But the
standard-version which is more tuned had no problems with Rybka.

Chrilly



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