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Subject: Re: Checks in the Qsearch

Author: Omid David

Date: 08:48:27 07/07/02

On July 06, 2002 at 23:23:28, Robert Hyatt wrote:

>On July 06, 2002 at 22:29:44, Omid David wrote:
>
>>On July 06, 2002 at 10:20:17, Robert Hyatt wrote:
>>
>>>On July 06, 2002 at 01:07:36, Ricardo Gibert wrote:
>>>
>>>>
>>>>Okay, but so what?
>>>>
>>>>>
>>>>>So perhaps the idea of "forward pruning" is foreign to us as well...
>>>>
>>>>I see no logical difference between deciding which moves are interesting and
>>>>worth looking at and deciding which moves are not interesting and not worth
>>>>looking at. It looks to me like 2 sides of the same coin, so your speculation
>>>>that "perhaps the idea of "forward pruning" is foreign to us as well..." does
>>>>not seem to be of any consequence.
>>>>
>>>
>>>However, that has been _the point_ of this entire thread:  Is DB's search
>>>inferior because it does lots of extensions, but no forward pruning.  I
>>>simply said "no, the two can be 100% equivalent".
>>
>>Just a quick point: The last winner of WCCC which *didn't* use forward pruning
>>was Deep Thought in 1989. Since then, forward pruning programs won all WCCC
>>championships...
>
>
>In 1992 no "supercomputer" played.  In 1995 deep thought had bad luck and lost
>a game it probably wouldn't have lost had it been replayed 20 times.   No
>"supercomputer" (those are the programs that likely relied more on extensions
>than on forward pruning due to the hardware horsepower they had) has played
>since 1995...
>
>I'm not sure that means a lot, however.  IE I don't think that in 1995 fritz
>was a wild forward pruner either unless you include null move.  Then you
>would have to include a bunch of supercomputer programs including Cray Blitz
>as almost all of us used null-move...

I personally consider null-move pruning a form of forward pruning, at least with
R > 1. I believe Cray Blitz used R = 1 at that time, right?

Re: Checks in the Qsearch Robert Hyatt 13:36:57 07/07/02
- Re: Checks in the Qsearch Omid David 13:47:33 07/07/02
  - Re: Checks in the Qsearch Robert Hyatt 18:43:47 07/07/02
    - Re: Checks in the Qsearch Omid David 20:42:03 07/07/02
      - Re: Checks in the Qsearch Robert Hyatt 20:53:16 07/07/02
        
        Re: Checks in the Qsearch Christophe Theron 21:21:23 07/07/02
        
        Re: Checks in the Qsearch Robert Hyatt 08:39:40 07/08/02
        
        Re: Checks in the Qsearch Christophe Theron 10:58:51 07/08/02
        
        Re: Checks in the Qsearch Robert Hyatt 20:32:09 07/08/02
        
        Re: Checks in the Qsearch Christophe Theron 00:40:31 07/09/02
        
        Re: Checks in the Qsearch Robert Hyatt 09:48:18 07/09/02
        
        Re: Checks in the Qsearch Christophe Theron 23:03:01 07/09/02
        
        Re: Checks in the Qsearch Robert Hyatt 08:14:54 07/10/02
        
        Re: Checks in the Qsearch Uri Blass 11:00:31 07/10/02
        
        Re: Checks in the Qsearch Robert Hyatt 11:28:37 07/10/02
        
        Re: Checks in the Qsearch Uri Blass 12:06:40 07/10/02
        
        Re: Checks in the Qsearch Robert Hyatt 08:58:15 07/11/02
        
        Re: Checks in the Qsearch Uri Blass 13:14:31 07/09/02
        
        Re: Checks in the Qsearch Robert Hyatt 13:37:53 07/09/02
        
        Re: Checks in the Qsearch Gian-Carlo Pascutto 00:46:08 07/10/02
        
        Re: Checks in the Qsearch Uri Blass 01:41:03 07/10/02
        
        Re: Checks in the Qsearch Steve Maughan 13:24:32 07/08/02
        
        Re: Checks in the Qsearch Christophe Theron 00:32:34 07/09/02
        
        Re: Checks in the Qsearch Robert Hyatt 10:35:48 07/09/02
        
        Re: Checks in the Qsearch Uri Blass 12:19:11 07/08/02
        
        Re: Checks in the Qsearch Christophe Theron 00:30:04 07/09/02
        
        Re: Checks in the Qsearch Uri Blass 09:29:17 07/08/02
        
        Re: Checks in the Qsearch Robert Hyatt 10:30:33 07/08/02
        
        Re: Checks in the Qsearch Uri Blass 12:00:46 07/08/02
        
        Re: Checks in the Qsearch Robert Hyatt 20:34:52 07/08/02
        
        Re: Checks in the Qsearch Uri Blass 22:56:15 07/08/02
        
        Re: Checks in the Qsearch Robert Hyatt 16:30:00 07/09/02
        
        Re: Checks in the Qsearch Uri Blass 01:29:04 07/11/02
        
        Re: Checks in the Qsearch Robert Hyatt 08:59:30 07/11/02
        
        Re: Checks in the Qsearch José Carlos 00:07:25 07/09/02
        
        Re: Checks in the Qsearch Omid David 13:44:29 07/08/02
        
        Re: Checks in the Qsearch Robert Hyatt 20:36:54 07/08/02
        
        Re: Checks in the Qsearch Uri Blass 14:11:07 07/08/02
        
        Re: Checks in the Qsearch Omid David 14:17:26 07/08/02

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