Crafty EGTB bug?

[R. Stievano]

Geschrieben von: / Posted by: R. Stievano at 02 January 2004 18:15:29:

Hi,
I run into problems with this simple KRKN position.
Just start Winboard and paste the following:
3r4/1K6/5N2/8/8/4k3/8/8 w - - 7 98
Now choose Analysis Mode. Crafty 19.6 (.exe from Dann's ftp) displays this:
depth=0 -327.39 1. Nh7
Nodes: 0 NPS: 0
Time: 00:00:00.01
this is obviously an error. Crafty is simply picking one of the losing moves in a dead drawn position. I checked everything with Yace and from Scid. There are 5 drawing and 8 losing moves here.
Crafty 18.13 (.exe from prof. Hyatt's ftp) simply outputs a 0.00 score without a move.
Is this a known issue? Maybe I'm doing something wrong...
hope this helps
Riccardo Stievano

[Dann Corbit]

Geschrieben von: / Posted by: Dann Corbit at 02 January 2004 20:23:57:
Als Antwort auf: / In reply to: Crafty EGTB bug? geschrieben von: / posted by: R. Stievano at 02 January 2004 18:15:29:

Hi,
I run into problems with this simple KRKN position.
Just start Winboard and paste the following:
3r4/1K6/5N2/8/8/4k3/8/8 w - - 7 98
Now choose Analysis Mode. Crafty 19.6 (.exe from Dann's ftp) displays this:
depth=0 -327.39 1. Nh7
Nodes: 0 NPS: 0
Time: 00:00:00.01
this is obviously an error. Crafty is simply picking one of the losing moves in a dead drawn position. I checked everything with Yace and from Scid. There are 5 drawing and 8 losing moves here.
Crafty 18.13 (.exe from prof. Hyatt's ftp) simply outputs a 0.00 score without a move.
Is this a known issue? Maybe I'm doing something wrong...
hope this helps

Yace analysis:
326 6.398 0.00 62f. 98.Ng4+ {EGTB} 98...Kf3 99.Ne5+ Kg3 100.Nc6 Re8
101.Na7 Rf8 102.Nc6 Rg8 103.Na7 Rh8 104.Nc6 Rg8
105.Na7 Rh8 106.Nc6 Rg8 {repetition} {-160}
Crafty epdpfga output:
3r4/1K6/5N2/8/8/4k3/8/8 w - - acd 4; acn 89; acs 1; ce -1; pv Ng4+;
I don't see a problem. Perhaps you are missing some key tablebase files.



my ftp site {remove http:// unless you like error messages}

[R. Stievano]

Geschrieben von: / Posted by: R. Stievano at 02 January 2004 21:05:37:
Als Antwort auf: / In reply to: Re: Crafty EGTB bug? geschrieben von: / posted by: Dann Corbit at 02 January 2004 20:23:57:

I don't see a problem. Perhaps you are missing some key tablebase files.

I've got all 3- & 4-men TBs (total: 70 files).
This cannot be a TB problem since all programs I'm running correctly give a drawing move.
The problem only affect analysis, actually if you force Crafty 19.6 to play a move it will play Ng4+ which is just fine. But if you analyze under WB, the analysis window keep saying "Nh7 and black mates". Haven't you been able to reproduce the problem in WB? Crafty 18.13 seems not affected. I'm using WB 4.2.6 under Win98SE. I'm just wondering if somebody can get the same wrong analysis using other machines, Nh7 is clearly a blunder.
regards
R. Stievano

[Rebert]

Geschrieben von: / Posted by: Rebert at 02 January 2004 23:53:20:
Als Antwort auf: / In reply to: Re: Crafty EGTB bug? geschrieben von: / posted by: R. Stievano at 02 January 2004 21:05:37:

I don't see a problem. Perhaps you are missing some key tablebase files.

I've got all 3- & 4-men TBs (total: 70 files).
This cannot be a TB problem since all programs I'm running correctly give a drawing move.
The problem only affect analysis, actually if you force Crafty 19.6 to play a move it will play Ng4+ which is just fine. But if you analyze under WB, the analysis window keep saying "Nh7 and black mates". Haven't you been able to reproduce the problem in WB? Crafty 18.13 seems not affected. I'm using WB 4.2.6 under Win98SE. I'm just wondering if somebody can get the same wrong analysis using other machines, Nh7 is clearly a blunder.
regards
R. Stievano

I get the same result with Crafty 19.6 as you do. When I try Crafty 19.4 or 19.3 I get the correct answer. Except for the .exe everything is identical between the versions, book, ini, etc. (lazy!)
Rebert