Author: Albert Silver
Date: 12:10:53 03/07/02
Go up one level in this thread
On March 06, 2002 at 14:42:06, Peter Berger wrote:
>On March 04, 2002 at 17:43:29, Albert Silver wrote:
>
>>The following position occurred in Spassky-Beliavsky, Reykjavik, 1988
>>
>>2b1qrk1/5p1p/pBn3p1/1p2p3/4P2N/bBP1Q3/P4PPP/3R2K1 w - -
>>
>>Spassky found a tremendous move 25.Nxg6!! and won the game. I don't think any
>>engines will have much luck with it but feel free to try it. I've analyzed it in
>>detail and can verify that it is the strongest move and correct, so as a further
>>challenge, see if you can find the *strongest* continuation after the possible
>>defense: 25...hxg6 26.Qh6 Be6!?
>>
>> Albert
>
>Gerrit Reubold's Bringer 1.9 needs 25 minutes on my AMD 1.33 GHz which still
>looks like a reasonable solution time to me.
>
>0:22:35.8 (15/44) 376443060 0.62 1.Nf3 Bg4 2.Bd5 Nb8 3.c4 Nd7 4.Qxa3 Nxb6
>0:24:59.4 (15/44) 417095484 0.63 1.Nxg6 (Mat=100,50=0)
>0:29:27.1 (16/47) 495277913 0.74 1.Nxg6 hxg6 2.Qh6 Be6 3.Rd3 f5 4.Rh3 Kf7
>5.Rg3 Ne7 6.exf5 Bxb3 7.fxg6+ Ke6
>0:52:26.5 (17/50) 895107271 0.79 1.Nxg6 hxg6 2.Qh6 Be6 3.Rd3 f5 4.Rh3 Kf7
>5.exf5 Bxb3 6.Qxg6+ Ke7 7.Rh7+ Rf7 8.axb3 Rxh7 9.f6+ Kd7 10.Qxh7+
>(Mat=-35,50=0)
>1:48:05.9 (18/52) 1878169802 0.78 1.Nxg6 hxg6 2.Qh6 Be6 3.Rd3 f5 4.Rh3 Kf7
>5.exf5 Bxb3 6.fxg6+ Ke7 7.Qg5+ Rf6 8.Rh7+ Ke6 9.Qg4+ Kd5 10.Rd7+ Bd6
>(Mat=-375,50=9)
>5:49:48.5 (19/59) 6424556986 0.67 1.Nxg6 hxg6 2.Qh6 Be6 3.Rd3 f5 4.Rh3 Kf7
>5.exf5 Bxb3 6.Qxg6+ Ke7 7.Rh7+ Rf7 8.axb3 Rxh7 (Mat=-555,50=0)
>
>The evaluation is not that conclusive but it was interesting to compair with
>Gambit Tiger 2.0 aggressive which showed a similar only faster behaviour and
>found it in 6-7 minutes at ply 14. Similar was that even which much higher depth
>the evaluation didn't rise further than right after it was found. Both seem to
>get it by simply searching deep (for example Nxg6 was below 10th place in the
>move order at ply 15 for Bringer and 3rd in Tiger's for ply 14).
>
>Although there were many results posted most were with a shorter thinking time.
>It would be interesting how long it takes other engines if they are given enough
>time to work it out a little longer.
Thanks for the interesting results. Can it find the stronger 1.Nxg6 hxg6 2.Qh6
Be6 3.Rd3 f5 4.Rg3! Rf6 5.Rh3, and if so how long does it take?
Albert
>
>Regards,
>pete
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