Author: Sune Fischer
Date: 02:51:37 08/30/02
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On August 30, 2002 at 05:26:04, Uri Blass wrote: >This is exactly the case for Junior and Fritz and they simply do not care about >small improvement that they can get. > >They know that there are positions when the program cannot see simple tactics >but they do not care to fix it. > >There are positions when Junior cannot see simple tactics and Amir ban knows >about it but he did not fix it at least not in Junior7(some years after he got >the information). > >There are positions when Fritz cannot see simple mate because of null move >pruning. I think they do care, but if it's only in a few weird special cases then it's not important. They tune their programs for the most likely positions, not the most unlikely ones. It will cost too much in normal positions if they have to take care of all the special cases. >I also know that not seeing simple tactic may be relevant in rare cases >for games but they do not fix it by having some verification search against >zunzwangs and it is possible to have verficiation search(yace does it). I don't know what a 'verification search' is, but I bet it isn't free to do, so in some positions they surely must be weaker because they 'waste' time on this verification. >I am sure that it is possible to have verification search in a productive way >and to fix the problem of Junior in a productive way and I do not believe that >the best that programs can do is to be blind in some situations. If verification means to double check your result, then it doesn't sound very productive to me. Probably it would be better to change the code somehow if there is a problem. IMO you have to be willing to take a few chances, any kind of pruning is also a potential backfire, but if it usually works well then it may be worth the occasional error. You can't ever hope to build the perfect program anyway, IMHO. -S. >Uri
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