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Subject: Re: Tough Tactic for Computers?

Author: blass uri

Date: 14:17:08 02/17/00

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On February 17, 2000 at 15:01:57, Dave Gomboc wrote:

>On February 17, 2000 at 12:39:36, Jeremiah Penery wrote:
>
>>On February 16, 2000 at 19:31:12, Dave Gomboc wrote:
>>
>>>On February 16, 2000 at 16:37:30, Jesus de la Villa wrote:
>>>
>>>>
>>>>After several hours neather(sp?)my software say something interesting, nor I. :(
>>>>Would you supply your main line, please.
>>>>
>>>>Thanks.
>>>
>>>I don't have one!  NCO ends with an eval of +-, that's it!
>>>
>>>Here's Crafty 17.6's latest:
>>>
>>>depth=16 1/36 +0.00 14. Nxg5 Rxf1+ 15. Qxf1 h6 16. Bc4+ Kh8 17. Nf7+ Kh7 18.
>>>Qd3+ g6 19. Qe3 Qf8 20. Rf1 Qg7 21. e6 Nc6 22. Ng5+ Kh8 23. Nf7+ Kh7
>>>Nodes: 2669305457 NPS: 70807
>>>Time: 10:28:18.30
>>>
>>>I am going to stop it thinking now; I have to get some real work done with my
>>>computer again. :-)  If someone else has some decent hardware and another
>>>program, I'm interested to see how it does.
>>
>>On ply 15 with my modified Crafty, I was getting a fail-high with score >.02
>>Since it was taking hours (it was running on 8 hours just to resolve the
>>fail-high), I was forced to stop it, so I could play Planescape. :)  I did
>>follow the line for a few moves, and the score kept going up as I went further
>>along.  I think it's just a case of computer mis-evaluation - white is slightly
>>down on material (at first), but black's pieces in the corner are useless to
>>him.  The computer doesn't realize this.  Not to mention that all white's >pieces are aiming at the nearly-naked black king.
>
>Crafty's variation wasn't bad at all.  In the main line above, 21. Nxh6 wins the
>house, and Black's only real alternative is 20...Bf5, which still loses.  But I
>was disappointed that it wasn't seeing that it was winning: the point of the
>variation is that White can castle (to reach the diagram position where I forced
>Black to play ...fxg5.)  If a program can't see that the piece is untakeable,
>the program can't see that White can castle safely.
>
>Dave

chessmaster6000(ss=10) can see in a less than 3 minutes that white is better
(+0.03)
The main line also begins with Ng5 Rxf1+
The evaluation in the next iteration is +0.64

Uri



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