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Subject: Re: Crafty EGTB Bug

Author: Slater Wold

Date: 15:20:56 01/02/04

Go up one level in this thread


On January 02, 2004 at 17:47:03, Luis Smith wrote:

>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?

Crafty does a sanity check on them before it opens.

>>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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