Author: Uri Blass
Date: 23:47:04 12/12/05
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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. What is shredder style search? 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. Based on the blitz rating list Rybka32 -bit lost 12.5-11.5 against Shredder9(see the link) so it does not seem to be tuned against shredder9 http://www.husvankempen.de/nunn/eloblitz.html#2 Uri
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