Author: John Merlino
Date: 17:21:12 11/29/02
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On November 29, 2002 at 16:42:56, Mike S. wrote: >On November 29, 2002 at 12:53:05, John Merlino wrote: > >>[D]8/2q1p1k1/3pP1p1/2pPNpNp/2P2B2/1p1B2K1/1P1R4/r7 w - - 0 42 >> >>CM9000, on a humble P3-733, finds 42.Nxg6! in 21 seconds. How do other engines >>fare? > >Analysis by Nimzo 8 (P3/700, 64 MB hash): > >1.Nd7 Qa7 2.Rf2 Qa2 3.Kh2 > ± (0.87) Depth: 1/11 00:00:00 58kN > ± (0.76) Depth: 5/17 00:00:00 58kN >1.Nc6 Ra8 2.Nf7 Re8 3.Rf2 Kh7 4.Bg5 h4+ > ± (0.77) Depth: 5/17 00:00:00 58kN > +- (1.62) Depth: 10/25 00:00:07 2694kN >1.Ngf7 Kh7 2.Nxg6 Rg1+ 3.Kh2 Rxg6 4.Bxf5 Kg7 5.Re2 Rg4 6.Bxg4 > +- (1.63) Depth: 10/25 00:00:13 5667kN > +- (2.34) Depth: 11/26 00:00:43 19670kN >1.Nxg6 Rg1+ 2.Kh2 Rg4 3.Rf2 Kxg6 4.Bxf5+ Kg7 5.Bxg4 hxg4 6.Rg2 > +- (2.35) Depth: 11/26 00:00:46 21624kN > +- (3.21) Depth: 13/29 00:01:23 38980kN > >It looks that transpositions are involved here, which would mean it's not a very >good testing position (no single best move): 1.Ngf7 threats Bh6+ and seems to >create the same mate net; Nxg6 can be played later, like in some of the Yace >variants Dieter has posted . (I didn't analyse deeply.) > >After 1.Nxg6 Kxg6? 2.Kh2 (as you mentioned), Black has no defense against the >threat 3.Rg2 and 4.Nf7+ Kf6 5.Bg5+ Kg7 6.Bxe7+ Kh7 7.Bxf5# > >Regards, >Mike Scheidl Thanks for that analysis. I wondered if Nxg6 could be played later or if it was necessary immediately. But, according to your output above, doesn't Nimzo decide on Nxg6 after 46 seconds? I would be curious to see what its output is after a few more minutes, since you appeared to stop the analysis after less than a minute and a half. Does Nimzo eventually switch to Ngf7 like Yace does? jm
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