Author: Joachim Rang
Date: 10:44:15 03/03/04
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On March 03, 2004 at 10:38:23, Joachim Rang wrote: >On March 03, 2004 at 10:14:50, Uri Blass wrote: > >>I wonder if the solution f6 is correct solution >> >>[D]r3r1k1/6p1/1pqp2Np/2p1nP1P/N1PbPQ2/1P3PR1/P2K4/7R w - - 0 1 >> >>I could not find a convincing line after f6 Nxc4+ but maybe I miss something. >> >>Movei could not solve it at 5 minutes per position on A1000 becasue after few >>minutes it changed its mind from f6 to Nc3 after failing low at depth 10. >> >>Uri > >I think you just discovered an error in this testsuite. Most engines fail low >over and over after: > >1.f6+ Nxc4+ 2. bxc4 Qxa4 3. f7+ Kh7 > >more (engine)-analysis will follow. > >regards Joachim The position is quite complicated and the variations long, so it is difficult to judge wheter 1.f6+ is winning or not. My opinion is, that it is not winning. All engines show big scores for white after 1.f6+ Nxc4+ 2. bxc4 Qxa4 3. f7+ Kh7 but if you go deeper in the lines the score drops steadily. I played around with Shredder 8 and produced two drawing lines (see below). There might be better moves but I was unable to find something convincing for white. It is clear, that after 1.f6+ white has a better position and that black is fighting for a draw, but since 1. Nc3 gives also a comfortable position for white I think the position should be taken out of the testsuite. 1. f6 Nxc4+ 2. bxc4 Qxa4 3. f7+ Kh7 4. Rc1 Qxa2+ 5. Rc2 Qa5+ 6. Ke2 Qa4 7. Rc1 Rf8 8. Nxf8+ Rxf8 9. Rg6 Qa7 10. e5 ( 10. Rxd6 Rxf7 11. Qd2 Qe7 = 10... Bxe5 11. Qe4 Kh8 = regards Joachim
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