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Subject: Re: Very strange crafty analysis ( I think) with a simple mate

Author: Andrew Williams

Date: 00:22:55 06/10/02

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On June 10, 2002 at 00:18:51, Les Fernandez wrote:

>On June 10, 2002 at 00:02:39, Robert Hyatt wrote:
>
>>On June 09, 2002 at 23:45:38, Les Fernandez wrote:
>>
>>>I rarely come across strange output using Crafty but this position doesnt seem
>>>to work right.  The ce after analysis I think should be -32765 but in fact it is
>>>reporting a "0"??? Either I am dead tired or something is screwy.  Would
>>>somebody using Crafty run this epd string? It is a very simple mate and I cant
>>>seem to find the problem.  Its probably just late <S>.
>>>
>>>Here is Crafty analysis:
>>>
>>>rnb4k/5r2/2p1p1Q1/pp3pP1/3P4/b2B1KP1/1PPB4/7R b - - acd 1; acn 1; acs 1; ce 0;
>>>pv Rh7;
>>>
>>>The pv appears to be right but the ce value is dead wrong!!
>>>
>>>If you find the same results can someone please explain the nature of this?
>>>
>>>[D]rnb4k/5r2/2p1p1Q1/pp3pP1/3P4/b2B1KP1/1PPB4/7R b - -
>>>
>>>
>>>Thanks
>>
>>Can you describe _exactly_ how you produced that?  IE post the epd file
>>you used, etc...
>>
>
>EPD Kit revision date: 1996.04.21
>unable to open book file [./book.bin].
>book is disabled
>unable to open book file [./books.bin].
>search time set to 180.00.
>hash table memory = 48M bytes.
>pawn hash table memory = 10M bytes.
>Crafty 18.9 vs ferret
>kibitz Hello from Crafty v18.9!
>pondering enabled.
>play best book line after search.
>EGTB access enabled
>using tbpath=./TB
>4 piece tablebase files found
>1406kb of RAM used for TB indices and decompression tables
>PFGA: EPD record: 1
>
>The exact epd string that was in epd.epd was:
>
>rnb4k/5r2/2p1p1Q1/pp3pP1/3P4/b2B1KP1/1PPB4/7R b - -
>
>And the epd.out file was:
>
>rnb4k/5r2/2p1p1Q1/pp3pP1/3P4/b2B1KP1/1PPB4/7R b - - acd 1; acn 1; acs 1; ce 0;
>pv Rh7;
>
>
>The analysis report can be found in my original post here.  This one puzzles me
>too Bob but I could not rule out that its late <S>.  If you need any additional
>info let me know.
>
>Thanks

Is this because Black has only one move? In my program, if there's only one move
available *during a game* it only searches to depth 4. For testing epd
positions, it searches normally, even if there is only one move.

Andrew



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