Author: Ryan B.
Date: 01:24:58 01/21/06
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On January 18, 2006 at 20:16:43, Ryan B. wrote: >On January 18, 2006 at 13:34:17, Chrilly Donninger wrote: > >>After playing several engine matches against Rybka (chess programming is a >>rather boring job) I have come to the conclusion: There are a few special >>evaluation features of Rybka which are really unique. It is interesting that >>some seamingly relative unimportant feature appear regularily on the board. The >>opponent has no idea of this feature and does not prevent it. And the search >>always finds a way to reach the pattern. Rybka has e.g. some special passed pawn >>evaluation terms. I do not want to tell the details, but the game Zappa-Rybka, >>Paderborn 2005 is a prototype game for one of these special features. >>But the main chess-knowledge which sets Rybka appart from other engines is >>ignorance. The omission of features which other engines have incorporated. >>I have written a longer article for the German "Schachkalender 2006". The >>message of this article is: Most of the published chess knowledge is completly >>useless. Give your favorite chess-enemy your chess-books as a present. They will >>do some harm on his play. >>Rybka seems to be to prove of this hypothesis. If a feature is - in a given >>position - correct, it is of course an advantage if a programm has implemented >>it. But if its wrong, the programm hangs on an advantage which does no really >>not exist. Or even worse, it sacrificies another advantage to reach the pattern. >> >>I realized the principle: "It is sometimes more important to remove features >>than to add ones" several times in the Hydra project. E.g. Piece-Square Tables >>are generally considered as a "must have". Strong Chessplayers do not like them. >>It is very unnatural for them to evaluate a piece without considering the >>context of the other pieces. It took some time till GM Lutz convinced me to >>remove them in Hydra. And indead, the programm played considerably stronger with >>Piece-Square. >>Insofar is the Rybka approach intelligent ignorance. >> >>Chrilly >> >>P.S.: The omission of Piece-Square-Tables is a feature of Hydra. I do not state, >>that Rybka as skipped this feature too. > >How much do you think the end of PV search helps in Rybka? I am surprised at >the tactical shots it catches but I think Rybka would still be strong without >it. Interesting idea at least. > >Ryan I guess I got it wrong? More like this? http://chessprogramming.org/cccsearch/ccc.php?art_id=319630 Ryan
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