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Subject: Re: pruning vs extensions vs qsearch - are these all effectively the sam

Author: Dave Gomboc

Date: 18:57:59 11/28/02

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On November 28, 2002 at 19:23:36, David Rasmussen wrote:

>On November 28, 2002 at 17:36:22, Dave Gomboc wrote:
>
>>
>>
>>I posted a corrected version of my post where I included a half-smiley.  This is
>>because the comment is half a joke, but also half serious.
>>
>>Philisophically, the main search already needs to deal with how best to search
>>at huge depths vs. how best to search at tiny depths.  Some search code ignores
>>the difference; it is these cases that probably depend on the presence of a
>>separate q-search the most.  Search code which is designed to be adaptive
>>according to search depth should not have trouble encompassing q-search as well.
>>
>>Practically, it may still be clearer to express what needs to be done near the
>>tips with a specific q-search routine.
>>
>
>That was sort of my points also: In principle, there aren't any differences
>between normal search and qsearch. Qsearch can be "expressed" within the
>framework of normal search with pruning/extensions. My other point was, that
>design matters a lot, and that what might be "semantically" equivalent, might
>not be when it comes to implementing, and/or expressing what to be done. A
>separate qsearch function is a very good idea, designwise, IMO.
>
>/David
Hmm.  My gut feeling is that a well-written main search makes a distinct
q-search routine of no benefit, and that separate q-search routines are harmful
to program development because they allow the developer to be lazy when
implementing the main search.

Dave



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