Author: rasjid chan
Date: 08:12:51 04/30/04
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On April 30, 2004 at 08:22:49, Steve Maughan wrote: >Rasjid, > >All strong Othello programs, mine included (Edge Reversi), use regression >models. This is due to the fact that Othello is close to 100% positional. >Chess, on the other hand, is 99% tactics - this is the problem. > >When I'm not playing chess I am usually creating commercial econometric models >so this is something I am know quite a bit about. IMNSHO it will be difficult >to get the regression approach to overcome the tactical component of chess. >What is likely to happen is the models will underestimate the value of the >parameters due to tactical 'noise'. Another problem is non-linearity - >multiple-LINEAR-regression cannot cope (easily) with non-linearity e.g. penalty >for squares around the King controlled by the opponent; if it's one the penalty >might be -0.1 but if it's eight it should be much higher than -0.8! > >This is one approach I was going to experiement with but I certainly don't think >it is the secret sauce for m(any) commercial engines. > >Regards, > >Steve Of course the secret sauce is not serious. You give a reasonable analysis. The only reason I posted is the Deep Blue team mentioned it was used. I'm not sure if finally it was put inside. Despite your fair reasons about non-linearity, I prefer the over-optimistic analysis. That chess programmers are smart guys and maybe they could find a way to get around things. Also nature seem to allow linearity often enough and so my nose smells using trusted drawn games and somehow, with GREAT LUCK, things get linear enough within +- 1/2 pawns.... Rasjid
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