Author: Robert Hyatt
Date: 09:28:32 06/30/02
Go up one level in this thread
On June 29, 2002 at 14:18:53, Christophe Theron wrote: >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 > > Hmmm.. I would _never_ make that statement. Have you _ever_ talked with Hsu or Campbell? I suspect not because if you had, you would not think them quite that incapable. > > >>"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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