Author: Uri Blass
Date: 07:16:29 02/15/06
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On February 15, 2006 at 10:04:28, Vasik Rajlich wrote: >On February 15, 2006 at 03:07:50, Joseph Ciarrochi wrote: > >>I have a naive question... >> >>in my understanding, Fruit has excellent search efficiency but not huge amounts >>of knowledge. In contrast, Fritz 9 and Rybka have substantial knowledge. If you >>can trust Rybka's depth outputs, it does not seem to be as quick at getting to >>deeper plys. >> >>I have observed that Fruit 2.2.1 tends to play poorly at blitz and improve >>steadly with long time controls, with it being an absolute god on the longest >>time controls (SSDF). In contrast, both rybka and fritz 9 play blitz well. >> >>do programs with more knowledge tend to play blitz better? Knowledge is kind of >>a quick, heuristic way of making a decision about what is likely to work. It >>presumably can come into play very quickly. In contrast, search takes time. >>However, it does discover when the knowledge is not useful (i.e., when the >>knowledge heuristic is inconsistent with the concrete variations uncovered by >>search; e.g., doubled pawns may generally be bad (knowledge heuristic), but in >>some situations can be quite good) >> >>is my reasoning correct? Maybe it would help for me to understand what >>constitutes "knowledge" in a chess program. I always presume its things like >>"doubled pawns are often bad" or two bishops are good, or it is often good to >>push pawns and have space.. >> >> >>best >>Joseph > >We need to keep our terminology straight. > >Chess knowledge (in the context of computer chess) is what makes a program play >well. At standard time controls, Fruit probably has a tiny bit more chess >knowledge than Fritz and Hiarcs. > >You can also talk about the complexity of a chess program. Hiarcs is probably >the most complex of the above three, and Fruit the simplest. Shredder is another >complex program. I suspect that the more complex programs are better at faster >time controls. I do not think that you are right here because fruit1.0 was relatively better at faster time control and it was not a complex program. better order of moves can make the program better at slower time control and better order of moves may be a result of complex algorithm to sort the moves. Uri
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