Author: Andrew Williams
Date: 07:50:50 10/10/00
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On October 10, 2000 at 10:24:57, Jim Monaghan wrote: >Hi Everyone, > >Let's get out our boards, er monitors, consider: To make the diagram appear, just put [D] before the fen string: [D]4q1kr/p6p/1prQPppB/4n3/8/2P5/PP2B2P/R5K1 w - - 0 1 Cheers Andrew > >I fed this into Crafty 17.13 and Yace 0.23. > >Crafty >13-> 12:18 -0.91 1. Qa3 Rxe6 2. Qxa7 Nf7 3. Bc4 Re4 >4. Bxf7+ Qxf7 5. Qxb6 Qe6 6. Qxe6+ >Rxe6 7. Kf2 Kf7 8. Rd1 Rhe8 9. Rd7+ >R6e7 > >Yace >98238463 903.3 -0.32 12f.: Qd6a3 a7a6 Be2b5 a6xb5 Qa3a7 Ne5d7 e6xd7 Qe8d8 >Qa7a3 Kg8f7 Qa3b3+ Kf7e7 Qb3b4+ Rc6c5 Bh6e3 >Qd8xd7 Be3xc5+ b6xc5 Qb4xc5+ Ke7f7 [0] > >They both perfer 1 Qa3 with a slight disadvantage after 15 minutes thought. > >the position is Gusev-Averbach, 1946 where white won as folows: > >1.Qxe5! (Black's king and rook are unfortunately placed inviting a neat queen >sac, which ties black up completely ... in spite of his huge material >advantage.) 1...fxe5 2.Rf1! (threatening 3.Bb5 and 4.Bxc6) 2...Rc8 [2...Rxe6 >3.Bc4 leads to mate] 3.Bd1! Rc4 [3...Qxe6 4.Bb3 Qxb3 5.axb3 and white's king >moves to the q-side] 4.Bb3 b5 5.Bxc4 bxc4 6.b3 (creating a passed pawn against >which black is helpless, as his queen is paralyzed by the threat of mate, 6 b4! >is still more precise) 6...a5 7.bxc4 Qe7 8.Kg2 Qa3 9.Rf2 Qe7 10.Rf1 g5? >[10...Qa3 11.Rf7 Qxa2+ 12.Kg3 Qa3 13.c5! Qxc3+ 14.Kg4 Qxc5 15.Rg7+ Kf8 >16.Rc7++-] 11.Rf5 g4 12.c5 Qd8 13.c6 Qe7 14.c7 (1-0) > >A beautiful positional sacrifice that is hard for engines to see ... the normal >evaluation of the pieces and position is exceptional. > >Can Gandolph solve this in 15 minutes? > >I posted this in the WB forum, apoligies for the duplicate, but perhaps some >here don't check there as often. Anyway, Jouni asks a good question ... >" Show me the win after 2... Rc7 or 2... Qe7. There is not a simple answer! >I tried this in Fritz 5, the strongest engine I have and stepping through it >slowly is not promising. I can't help but feel (hope) that Gusev was right. In >some lines the key is not to liquadate white's pressure, but slowly improve >white's game. For instance, 1Qxe5 fxe5 2Rf1 Rc7 3Bd1 Re7 4Bb3 a6 5Rf7 Rxf7 >6exf7+ Qxf7 7Kg2, hmmm Black is close to consolidating here. > >Two questions: Could someone with a stronger engine save Gusev? And (2) what >program is used to make those neat diagrams on this newsgroup and how is the >image pasted? Sorry if this second one is dumb:-) > >Cheers, > >Jim
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