Author: Christophe Theron
Date: 11:18:53 06/29/02
Go up one level in this thread
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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