Author: Christophe Theron
Date: 11:18:53 06/29/02
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On June 28, 2002 at 17:54:56, Keith Evans wrote: >On June 28, 2002 at 16:33:10, Scott Gasch wrote: > >>Another idea that I read from was that generating non-capturing checks in the >>qsearch against a side that has had a chance to stand pat already is a waste. I >>really don't understand this idea and disagree with it. Imagine black has had >>an oppertunity to stand pat but instead plays RxN (N appears hung). Well this >>looks really good unless white then generates Qd4+ forking blacks R and K and >>winning the R. If you neglect to generate checks on a side who has already had >>the chance to stand pat you let him get away with RxN and like it. If the only >>reason to add checks to the qsearch is to find mates then I agree -- checking >>after a side could stand pat is wasted. But if the goal is to improve tactical >>play then I think this idea is not sound. > >I'll be very interested to see what responses this generates. Hsu took the time >to design and implement special logic to help generate checking and check >evasion moves in Deep Blue which I assume was used in qsearch. This was not a >trivial undertaking - it adds both additional logic and additional interconnect. >He probably had a good reason for doing it, since he could have used that time >for something else like implementing a small hash table. And maybe he had no good reason to do it. As far as I know there are many amateur programmers here that have spent much more time in trying and validating ideas (not even speaking of the commercial programmers) than Hsu. I think Hsu and his team have done a great job in implementing a chess program in a chip. However I think taking him and his team as a reference in chess programming is a big mistake. As I have said, I think there are many chess programmers here who are much more skilled than Hsu and his team in chess programming. Christophe >"The Deep Blue chip has a number of additional functions, including the >generation of checking and check evasion moves, as well as allowing the >generation of certain kinds of attacking moves, which permits improved >quiescence searching. The chip also supports several search extensions, >including singular extensions" > >If anybody could enlighten me about the usefulness of this additional logic I >would be grateful. > >Regards, >Keith
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