Author: Vasik Rajlich
Date: 00:16:20 12/13/05
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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 Hi Chrilly, what you write is very interesting. I can add three things: 1) 99% of Rybka testing was against Shredder 9. It was more of a practical thing, each previous version had a "rating" against Shredder. In the future we will be more complete of course. 2) I have also seen the phenomenon where differences are exaggerated against an older version. In particular, I have found that adding just one smaller but sound eval term often gives fairly nice scores against the old version while games against a completely different engine will sink into statistical noise. 3) There are some things missing from the Rybka eval but don't worry - not for long (hopefully) :) Vas
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