Author: Uri Blass
Date: 11:53:34 12/05/01
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On December 05, 2001 at 14:15:59, Robert Hyatt wrote: >On December 05, 2001 at 03:12:49, Russell Reagan wrote: > >>If I run any top chess program, eventually the program doesn't get any new best >>move. Is this because the next ply is simply taking too long, or is it because >>the engine isn't designed to do searches for long periods of time (like days or >>weeks)? >> >>In other words, is it possible to write a program that is better suited for >>searching to deeper depths if it were given, say, 1 year to search for the best >>move? Or are current algorithms about as good as we're going to get in long term >>analysis? >> >>Another way of phrasing this would be: Is there any difference between a program >>designed to analyze completed games over long periods of time and a program that >>plays chess at a shorter time interval? > > >A program "hits the wall" for various reasons. The most common is that once >you totally saturate the hash table, move ordering starts to break down and >the effective branching factor grows. I do not think that the effective branching factor of Deep Fritz grows at long time controls. one of the reason that I prefered Deep Fritz and not other programs for long analysis is the fact that Deep Fritz knows to count knodes correctly even when the number of nodes is bigger than 2^32 I remember thar I read that Crafty is using the number of nodes for order of moves so it is a reason not to use it for long analysis because the order of moves at big depth may become wrong. I was also afraid that other programs that do not know to count nodes correctly may have problems at long time control as a result of not knowing to count nodes correctly. The only program that I can trust for long time control except Deep Fritz is Tiger because I remember that Christophe said that he does not use the number of nodes for order of moves. Uri
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