Author: Uri Blass
Date: 05:05:12 01/31/06
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On January 31, 2006 at 07:29:27, ramon b. de robles wrote: >Thanks Uri and Martin for the wonderful info about Rybka. > >I will test Rybka using the ECE and MES as well as SUNEPOS from Rebel Site. >How about the underpromotions, Is it OK ? > >So what is Vas saying of adding additional endgame heuristics. After that >addition, Rybka will be almost unbeatable. > >And how about the comment of Mr. Donninger . Is this comment valid/true ? > >Chrilly Donninger > >I experimented recently with a Shredder-style search in Hydra. The >single-processor Shredder/Hydra completely 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. > >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. I agree that Rybka has some weakness in evaluating king attacks but Chrilly does not want to discover what is Shredder style search. I remember also that he does not want to discover the pruning that he does in hydra because he said one mistake of revealing null move pruning was enough. Chrilly is clearly not open about what hydra does and I do not trust what he says when his program is private. Hydra did not play in the last tournaments and it is clearly possible that hydra is weaker than rybka. Uri
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