Author: Mike S.
Date: 13:42:56 11/29/02
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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
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