Author: Joachim Rang
Date: 10:48:07 03/03/04
Go up one level in this thread
On March 03, 2004 at 13:39:40, John Merlino wrote: >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 > >I don't think there is a problem. After forcing those moves, Chessmaster 9000 >(SKR personality on a P4-2.4) still shows a good score for White. I think >(perhaps inadvertantly) the point is that f6 is the BEST move and that the >engine shouldn't fail TOO low on f6 Nxc4+...? Not sure.... > >Perhaps the point is to see that, after the above moves, White must play 4.Rc1 >rather than 4.fxe8=Q which leads to a draw. > >I also believe, after a lot of analysis and playing around with lines, that f6 >does not necessarily lead to a forced win. I DO believe that it is the best >move, however. > >Here is what The King says: > >Time Depth Score Positions Moves >0:00 1/4 0.00 11790 4.fxe8=Q Qxa2+ 5.Ke1 Qf2+ 6.Kd1 > Ra1+ 7.Qc1 Rxc1+ 8.Kxc1 Qe3+ 9.Kd1 > Qd3+ 10.Ke1 Qe3+ 11.Kd1 >0:00 1/4 2.14 30977 4.Rc1 Bb2 5.Ke2 Bxc1 6.fxe8=Q Qxe8 > 7.Qxc1 Rxa2+ 8.Kf1 >0:00 1/5 0.69 82668 4.Rc1 Qxa2+ 5.Rc2 Qa5+ 6.Kd1 Qa1+ > 7.Qc1 Qxc1+ 8.Rxc1 >0:01 1/6 1.51 215880 4.Rc1 Qxa2+ 5.Rc2 Qa5+ 6.Kd1 Qa1+ > 7.Qc1 Qxc1+ 8.Rxc1 Red8 9.f8=Q > Rxf8 10.Nxf8+ Rxf8 >0:02 1/7 0.90 511853 4.Rc1 Qxa2+ 5.Rc2 Qa5+ 6.Ke2 Qa4 > 7.Qd2 Red8 8.f8=Q Rxf8 9.Nxf8+ Rxf8 >0:06 1/8 0.90 1468350 4.Rc1 Qxa2+ 5.Rc2 Qa5+ 6.Ke2 Qa4 > 7.Qd2 Red8 8.f8=Q Rxf8 9.Nxf8+ Rxf8 >0:17 1/9 1.64 3754458 4.Rc1 Qxa2+ 5.Rc2 Qa5+ 6.Ke2 Qa4 > 7.Rc1 Qa2+ 8.Qd2 Qxd2+ 9.Kxd2 Rec8 > 10.f8=Q Rxf8 11.Nxf8+ Rxf8 >0:39 1/10 1.72 9003412 4.Rc1 Qxa2+ 5.Rc2 Qa5+ 6.Ke2 Qa4 > 7.Rc1 Qa2+ 8.Qd2 Qxd2+ 9.Kxd2 Rec8 > 10.f8=N+ Rxf8 11.Nxf8+ Rxf8 12.Kd3 >1:47 1/11 1.70 24869003 4.Rc1 Qxa2+ 5.Rc2 Qa5+ 6.Ke2 Qa4 > 7.Rc1 Rf8 8.Nxf8+ Rxf8 9.Rg2 Qb3 > 10.Kf1 b5 >4:09 1/12 1.74 59144260 4.Rc1 Qxa2+ 5.Rc2 Qa5+ 6.Ke2 Qa4 > 7.Rc1 Red8 8.f8=Q Qa2+ 9.Qd2 Qxd2+ > 10.Kxd2 Rxf8 11.Nxf8+ Rxf8 12.Kd3 > Be5 >9:22 1/13 1.24 135219441 4.Rc1 Qxa2+ 5.Rc2 Qa5+ 6.Ke2 Qa4 > 7.Rc1 Red8 8.Kf1 Qa2 9.Rg2 Qa3 > 10.Rd1 Qa4 11.Rxd4 Qa1+ 12.Ke2 > Qxd4 13.f8=Q Rxf8 14.Nxf8+ Kg8 >27:10 2/14 1.42 387147633 4.Rc1 Qxa2+ 5.Rc2 Qa5+ 6.Ke2 Qa4 > 7.Rc1 Rf8 8.Nxf8+ Rxf8 9.Rg6 Qa2+ > 10.Qd2 Qa7 11.Qd3 Qxf7 12.Rb1 Qf4 > 13.Rxb6 > >jm go deeper in the variations. For example after 4.Rc1 Qxa2+ 5.Rc2 Qa5+ 6.Ke2 Qa4 7.Rc1 Rf8 8.Nxf8+ Rxf8 9.Rg6 9... Qa7! draws. What score does CM9SKR shows after Nc3?
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