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Nolot 01

r3qb1k/1b4p1/p2pr2p/3n4/Pnp1N1N1/6RP/1B3PP1/1B1QR1K1 w - - 0 1

Nolot's analysis as reported by Baudot:

Kasparov-Karpov, 20th game 1990

26.Nxh6!! c3 (26... Rxh6!? is not sufficient: 27.Nxd6 Qh5 (best) 28.Rg5! Qxd1 29.Nf7+ Kg8 30.Nxh6+ Kh8 31.Rxd1 c3 32.Nf7+ Kg8 33.Bg6! Nf4 34.Bxc3 Nxg6 35.Bxb4 Kxf7 36.Rd7+ Kf6 37.Rxg6+ Kxg6 38.Rxb7 +-) 27.Nf5! cxb2 28.Qg4 Bc8 (if 28... g6!? 29.Kh2! wins : 29...Qd7 30.Nh4 Bc6 31.Nc5! dxc 32.Rxe6 Nf6 33.Nxg6+ Kg7 34.Qg5 Nbd5 35.Ne5 Kh8 36.Nxd7 +-) 29.Qh4+ Rh6 30.Nxh6 gxh6 31.Kh2! Qe5 32.Ng5 Qf6 33.Re8 Bf5 34.Qxh6 (pretty, but there was a mate in 6 : 34.Nf7+ Qxf7 35.Qxh6+ Bh7 36.Rxa8 Nf6 37.Rxf8 Qxf8 38.Qxf8+ Ng8 39.Qg7#) 34...Qxh6 35.Nf7+ Kh7 36.Bxf5+ Qg6 37.Bxg6+ Kg7 38.Rxa8 Be7 39.Rb8 a5 40.Be4+ Kxf7 41.Bxd5+ 1-0

A very deep combimation, that Tasc R30 or Genius 2 running on a pentium would take between a few months and a few years to find. The best Novag computer, the Diablo 68000, finds 26.Nxh6 after 7 months and a half (Pierre Nolot has let it run on the position for 14 months and one day, until a power failure stopped an analysis of over 80 000 000 000 nodes!) but for wrong reasons : it evaluates white's position as inferior and thinks this move would enable it to draw.

Comments by Feng-Hsiung Hsu:

Kasparov played Nh6 here. DT-2 agreed with Kasparov's analysis after going down the line given in Informant, but could not find the move on its own in one hour time. When letting it run overnight, it produced Nh6 after 8 hours (but would play it with a 6 hours/move time control; that is, it got first indication that the combination might work after about 6 hours), with the variation 1. Nh6! c3 2. Nf5 cb2 3. Qg4 ... which wins for white.

My own experience:

Ferret finds this in under an hour on a quad 450 mhz Xeon machine.  The score is negative, and in four hours it is above +1.

 
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Copyright © 2001 Bruce Moreland
Last modified: 11/04/02