Author: James T. Walker
Date: 11:58:12 01/31/06
Go up one level in this thread
On January 31, 2006 at 08:05:12, Uri Blass wrote: >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 Hello Uri, I think you are right to say Chrilly does not want to disclose his secrets about Hydra. My question is. Why not?? Since Hydra is not a commercial venture for profit I don't understand his secrecy. Maybe he doesn't want people to know what it's weakness is. In any case I find Hydra about as interesting as Deep Blue (zero). If I can't play with it then it's of no value to me. Jim
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