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Subject: Re: Junior 8 doesn't see this simple mate

Author: Omid David Tabibi

Date: 07:29:15 08/21/03

On August 21, 2003 at 10:10:54, Mihaly Szalai wrote:

>[D]8/8/8/4p1p1/6N1/5p1p/5K2/7k w - - 0 1
>
>All the programs I've tried see the mate
>except Junior 7 and 8. They go to depth=63
>and score=0.00 in a few seconds then stop.
>Why? One knight is not enough to mate?

Interesting case. I guess when one side is left with a knight or a bishop,
Junior sets beta = 0, i.e., that he cannot achieve more than a draw. It is a
kind of tradeoff: in many positions this knowledge saves a lot of search (by
pruning the tree), but in very rare examples like the above, it produces
erroneous results.

I believe that the risk is negligible in comparison to the considerable gain.
However, as a matter of principle I'm against such "assumptions"...

Re: Junior 8 doesn't see this simple mate Robert Hyatt 12:20:40 08/21/03
- Re: Junior 8 doesn't see this simple mate Omid David Tabibi 13:05:34 08/21/03
- Re: Junior 8 doesn't see this simple mate Dieter Buerssner 12:56:45 08/21/03
  - Re: Junior 8 doesn't see this simple mate Tord Romstad 06:42:35 08/22/03
    - Re: Junior 8 doesn't see this simple mate Robert Hyatt 07:35:02 08/22/03
      - Re: Junior 8 doesn't see this simple mate Tord Romstad 09:54:29 08/22/03
        
        Re: Junior 8 doesn't see this simple mate Dave Gomboc 15:37:57 08/27/03
Re: Junior 8 doesn't see this simple mate Omid David Tabibi 07:41:26 08/21/03
- Re: Junior 8 doesn't see this simple mate Sune Fischer 11:13:00 08/21/03
  - Re: Junior 8 doesn't see this simple mate Omid David Tabibi 11:35:25 08/21/03
    - Re: Junior 8 doesn't see this simple mate Sune Fischer 11:48:55 08/21/03
      - Re: Junior 8 doesn't see this simple mate Omid David Tabibi 13:02:35 08/21/03
        
        Re: Junior 8 doesn't see this simple mate Sune Fischer 13:42:04 08/21/03
        
        Re: Junior 8 doesn't see this simple mate Omid David Tabibi 14:25:46 08/21/03
        
        Re: Junior 8 doesn't see this simple mate Sune Fischer 14:34:35 08/21/03
        
        Re: Junior 8 doesn't see this simple mate Omid David Tabibi 14:49:45 08/21/03
        
        Re: Junior 8 doesn't see this simple mate Dieter Buerssner 13:09:42 08/21/03
        
        Re: Junior 8 doesn't see this simple mate Robin Smith 14:51:53 08/21/03
        
        Re: Junior 8 doesn't see this simple mate Dieter Buerssner 15:02:06 08/21/03
        
        Re: Junior 8 doesn't see this simple mate Omid David Tabibi 13:16:55 08/21/03
      - Re: Junior 8 doesn't see this simple mate Uri Blass 12:42:39 08/21/03
        
        Re: Junior 8 doesn't see this simple mate Sune Fischer 14:10:05 08/21/03
        
        Re: Junior 8 doesn't see this simple mate Uri Blass 14:21:06 08/21/03
        
        Re: Junior 8 doesn't see this simple mate Sune Fischer 14:27:05 08/21/03
        
        Re: Junior 8 doesn't see this simple mate Uri Blass 14:40:11 08/21/03
        
        Re: Junior 8 doesn't see this simple mate Sune Fischer 14:56:49 08/21/03
- Re: Junior 8 doesn't see this simple mate Mihaly Szalai 09:27:49 08/21/03

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