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Subject: Re: Crafty EGTB Bug

Author: Luis Smith

Date: 14:47:03 01/02/04

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On January 02, 2004 at 17:02:31, Robert Hyatt wrote:

>On January 02, 2004 at 14:10:59, Luis Smith wrote:
>
>>Someone posted this position in the Winboard forum
>>
>>[D]3r4/1K6/5N2/8/8/4k3/8/8 w - - 7 98
>>
>>This is what Crafty displays under analysis mode.
>>
>>depth=0 -327.39 1. Nh7 <EGTB>
>>Nodes: 0 NPS: 0
>>Time: 00:00:00.01
>>
>>If you disable EGTB's it displays one of the drawing moves.  However if you
>>force it to play as black it plays Ng4+ one of the drawing moves.
>
>
>I don't know what could cause this.  I set the position up and I get
>the expected answer in analysis mode:

I think I might have incomplete Tablebases.  Is there a utility that checks for
you or something?

>
>White(1): 3r4/1K6/5N2/8/8/4k3/8/8 w - - 7 98
>1. Nh5 Rd1 2. Nf6 Ra1 3. Ng8 Rb1+ 4. Kc8 Ra1 5. Ne7 Rb1 6. Ng8 Ra1
>White(1): an
>Analyze Mode: type "exit" to terminate.
>end-game phase
>              clearing hash tables
>              time surplus   0.00  time limit 22.50 (3:30)
>              depth   time  score   variation (1)
>                1     0.00  -0.58   1. Nh7
>                1->   0.01  -0.58   1. Nh7
>                2     0.02     --   1. Nh7
>                2     0.03 -Mat14   1. Nh7 <EGTB>
>                2     0.04     ++   1. Ng4+!!
>                2     0.05   0.01   1. Ng4+ <EGTB>
>                2->   0.06   0.01   1. Ng4+ <EGTB>
>                3     0.06   0.01   1. Ng4+ <EGTB>
>                3->   0.06   0.01   1. Ng4+ <EGTB>
>                4     0.06   0.01   1. Ng4+ <EGTB>
>                4->   0.06   0.01   1. Ng4+ <EGTB>
>              time=0.06  cpu=0%  mat=-2  n=92  fh=100%  nps=10K
>              ext-> chk=9 cap=0 pp=0 1rep=0 mate=0
>              predicted=0  nodes=92  evals=1
>              endgame tablebase-> probes=13  hits=13



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