Author: Uri Blass
Date: 10:34:47 03/04/06
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On March 04, 2006 at 12:56:17, Lar Mader wrote: >I gave Fritz 9 and Deep Shredder 9 about 20 minutes each. They both settled on >Qe3 as the best move, but they did not understand that there was a forced draw >by repetition. They still evaluated black's position as worse by roughly a >pawn, plus or minus. Sorry for not clipping the analysis, I just figured the >point was to see if they could find the draw... There is no forced draw and I remember that even yace after long analysis saw a small positive score for white. I think that the main question is how much time they need to find a line like 1...Qe3 2.Qxd6 Re8 3.Qd7+(or Qc7+) Re7 4.Qc6 with no perpetual check(probably a draw but I am not sure). 3.h4 h5 4.Bf3 Qc1+ is leading to a forced draw and this is the problem that they cannot see in tournament time control from the root. I know that programs of today can find both Qe3 and avoid Kf1 I did not test rybka in the Kf1 problem but finding Qe3 is easy for it. Here is rybka's analysis on Athlon64 3000(512 mbytes hash 2 ghz) New game 1r6/5kp1/RqQb1p1p/1p1PpP2/1Pp1B3/2P4P/6P1/5K2 b - - 0 1 Analysis by Rybka 1.01 Beta 13d 32-bit: 1...Qxc6 ± (1.37) Depth: 3 00:00:00 1...Qxc6 +- (1.78) Depth: 4 00:00:00 1...Qxc6 2.dxc6 +- (1.79) Depth: 5 00:00:00 1...Qxc6 2.dxc6 Be7 +- (1.70) Depth: 6 00:00:00 2kN 1...Qxc6 2.dxc6 Bc7 3.Ra7 +- (2.12) Depth: 7 00:00:00 8kN 1...Qxc6 2.dxc6 Be7 3.Ke2 Ke8 +- (2.38) Depth: 8 00:00:00 17kN 1...Qxc6 2.dxc6 Rc8 3.Ra7+ Kf8 4.Rb7 Rc7 +- (2.58) Depth: 9 00:00:00 46kN 1...Qxc6 2.dxc6 Rc8 3.Ra7+ Rc7 4.Ra5 Rc8 5.Ke2 +- (2.48) Depth: 10 00:00:00 67kN 1...Qxc6 2.dxc6 Rc8 3.Ra7+ Kf8 4.Rb7 Rc7 5.Rxb5 Ra7 +- (2.54) Depth: 11 00:00:01 108kN 1...Qxc6 2.dxc6 Rc8 3.Ra7+ Kf8 4.Ke2 Rc7 5.Ra5 Ke8 6.Ke3 +- (2.76) Depth: 12 00:00:03 283kN 1...Qxc6 2.dxc6 Rc8 3.Ra7+ Rc7 4.Ra8 h5 5.Bd5+ Ke7 6.Rg8 e4 7.Rxg7+ Kf8 8.Rg8+ +- (2.81) Depth: 13 00:00:04 473kN 1...Qe3 2.Qxd6 Re8 3.h4 Re7 4.Bf3 Qc1+ 5.Kf2 Qd2+ 6.Kg3 Qe1+ 7.Kh3 Qh1+ 8.Kg4 +- (2.05) Depth: 13 00:00:26 1741kN 1...Qe3 2.Qxd6 Re8 3.h4 h5 4.Bf3 Qc1+ 5.Kf2 Qd2+ 6.Be2 Qf4+ 7.Kg1 Qc1+ 8.Kh2 +- (2.58) Depth: 14 00:00:44 2883kN 1...Qe3 2.Qxd6 Re8 3.h4 h5 4.Bf3 Qc1+ 5.Kf2 Qd2+ 6.Be2 Qf4+ 7.Kg1 Qc1+ 8.Kh2 +- (2.58) Depth: 15 00:01:08 4480kN 1...Qe3 2.Qxd6 Re8 3.h4 h5 4.Bf3 Qc1+ 5.Kf2 Qd2+ 6.Be2 Qf4+ 7.Kg1 Qc1+ 8.Kh2 +- (2.38) Depth: 16 00:02:04 7985kN 1...Qe3 2.Qxd6 Re8 3.h4 h5 4.Bf3 Qc1+ 5.Kf2 Qd2+ 6.Be2 Qf4+ 7.Kg1 Qc1+ 8.Kh2 +- (1.51) Depth: 17 00:04:31 17205kN 1...Qe3 2.Qxd6 Re8 3.h4 h5 4.Bf3 Qc1+ 5.Kf2 Qd2+ 6.Be2 Qf4+ 7.Kg1 Qc1+ 8.Kh2 +- (1.51) Depth: 18 00:07:45 29910kN (, 04.03.2006) Uri
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