Author: Uri Blass
Date: 20:12:04 03/05/02
Go up one level in this thread
On March 05, 2002 at 15:27:58, Dann Corbit wrote: >On March 05, 2002 at 13:35:06, Uri Blass wrote: > >>On March 05, 2002 at 11:43:35, Dann Corbit 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!? >> >> >>This defence was discussed by albert silver and by me >> >>25.Nxg6 hxg6 26.Qh6 Be6 27.Rd3 f5 >>28.Rg3 Rf6 29.Rh3 Kf7 30.Qh7+ Kf8 31.exf5 Bxb3 32.axb3 >>seems to be decisive for white >> >>Yace proved 1.20 pawns for white in the root position for Nxg6 based on some >>analysis that is based mainly on this line. > >The two lines (first the yace line, then the crafty 1 hr analysis:) >W B W B W B W >Nxg6 hxg6 Qh6 Be6 Rd3 f5 Rg3 Rf6 Rh3 Kf7 Qh7+ Kf8 exf5 Bxb3 axb3 c0 "seems to >be decisive for white"; >Nxg6 hxg6 Qh6 Be6 Rd3 f5 Rh3 Kf7 Qh7+ Kf6 Qh4+ Kg7 Bxe6 Qxe6 exf5 Qg8 Qh6+ Kf6 >fxg6 Ke6 Rd3 Qh8 Qd2 Kf6 > >Agree out to Rg3 verses Rh3. So I went to Rg3 and analyzed what would happen >there: >[D]4qrk1/8/pBn1b1pQ/1p2pp2/4P3/bBP3R1/P4PPP/6K1 b - - acd 14; acn 546692901; acs >1001; c0 "after Nxg6 hxg6 Qh6 Be6 Rd3 f5 Rg3"; ce 82; pv Rf6 Rh3 Kf7 Bd5 Ke7 c4 >Bb4 Qg7+ Qf7 Qh8 Qf8 Bxc6 Qxh8 Rxh8 Bxc4; > >I remain unconvinced that this line is better. Bd5 is not the right move in your line If you want to contradict the line that I post you need to say what is the right move for black I can add more moves I guess that the right way to beat Crafty in that position is: 25.Nxg6 hxg6 26.Qh6 Be6 27.Rd3 f5 28.Rg3 Rf6 29.Rh3 Kf7 30.Qh7+ Kf8 31.exf5 Bxb3 32.axb3 Ne7(or Rxf5 b4) 33.Qh8+ Ng8 34.b4(the idea is to capture the bishop at a3 for example Rxb6 35.Rh7 Qf7 36.Rxf7+ Kxf7 37.Qh7+ Kf8 38.fxg6 and the black bishop is trapped in few moves). Crafty cannot see after Rg3 that white is winning and this is the reason that Albert Silver gave more moves. He gave until 31.exf5 and I added more moves. I believe that you can start from the position after 34.b4 and go backward to find if black has better alternative This is exactly what I did and yace had 32...gxf5 with +1.20 in the pv. I believe that gxf5 also losing but I was too lazy to prove a score of more than +1.20 with yace. yace saw more than +2 after 32...Rxf5 or 32...Ne7 so it has not choice but 32...gxf5 thanks to learning. Uri
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