Author: Stuart Cracraft
Date: 11:16:58 01/04/06
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On January 03, 2006 at 20:26:51, Vincent Diepeveen wrote: >There is at least a 30 tricks which i'm using in diep where i hear no one about. >And please realize, diep has a very pathetic search when compared to certain >other engines. > >The basic concepts are nullmove R=3, transposition tables and worlds biggest >evaluation function. > >Vincent Then you are in a good position to evaluate what is Rybka, why is Rybka and most importantly how is Rybka. You have extremely large evaluation function - this is rumored of Rybka. Everybody seems to have nullmove R=2 or 3 these days and transposition tables are old hat. Nothing new there. The newness seems to be the search-style of Rybka with its large evaluation. I would hazard a guess at the search style being key in Rybka. He is searching with probabilities, conspiracy-number search, something like that. McAllister didn't come up with great practical outcome for CNS and I don't think anyone else has. So what is this. If I use probabilities for evaluation at terminal nodes, mapping say 5 pawns to a certain win and grading it down, similar to a sigmoid or tanh, quite similar to what we do for the learning function in temporal differences (which works fine by the way), then my evaluation is probabilistic. How does this help me in search? Why is it better? I should re-read McAllister's paper but it was not probabilistic as I recall though it's been many, many years. Probabilistic evaluation is something to think about as the rumor is that the top program (Rybka) is using it, besides its large evaluation. I understandyour point that when enough people do it, it leaks out. Commercial is always ahead of the rest, no question about it. But the point of this board, one at least, is to help accelerate the process. What harm is it to anyone? Does anyone actually make a living for very long on computer chess coding? I think not. Greetings, Stuart
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