Author: Peter Fendrich
Date: 10:26:54 04/15/98
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On April 15, 1998 at 13:12:57, Christophe Theron wrote: >On April 15, 1998 at 13:01:42, Peter Fendrich wrote: > >>I am trying a swapoff algorithm (sometimes called SEE) instead of the >> more classic quiescence search. >>The extra time saved by this can be used for more agressive extensions >>or better evaluation. >>The drawback is of cource the increased risk for tactical mistakes. >> >>In short depths the swapoff makes too many mistakes to be useful but >>when the depth increases I see less of the mistakes but still have >>that extra time it saves for me. >> >>In my opinion it should be a break even, at some depth limit, between >>these two alg's and beyond that limit the swapoff is the best choice. >> >>Comments? >> >>/Peter > >The swapoff idea is the first thing that comes in mind when someone >begins to write a chess program. That's how I begun, at least. > When I wrote my first chess program about 1980 SEE wasn't a known concept, at least not for me! >IMO it is not as fast as a simple QSearch. This is counterintuitive, but >as depth increase, QSearch has less and less job to do, because there >are more and more alphabeta cutoffs before or on entering in the >QSearch. The SEE code itself should be faster than Qsearch, shouldn't it? > >On the other hand, a SEE has always the same amount of job to do, >whatever the depth is. In any case, more job than QSearch. > I dont't follow you here. If QSearch has less job to do, then the SEE has as well. The QSearch is just replaed by the SEE. >And I don't even mention the huge blunders you will never get rid off >with your SEE, even if you make it very clever. > >Just my opinion, based on experience. > >Anyway, writting a good SEE is useful, because you can use it for >selection purposes. I have two versions of SEE, a fast one used to order generated captures and one more accurate and slower to replace the QSearch. > > > Christophe
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