Author: Uri Blass
Date: 05:31:16 03/01/02
Go up one level in this thread
On March 01, 2002 at 05:50:12, Ernst Walet wrote: >I let Fritz7 run for over 24 hours, completing 22 plies, with the following >result. > >Ernst. > >b6e3 - black >1r6/5kp1/RqQb1p1p/1p1PpP2/1Pp1B3/2P4P/6P1/5K2 b - - 0 1 > >Analysis by Fritz 7: > >1...Qxc6 2.dxc6 Bc7 3.Ra7 Rc8 4.Bd5+ Ke8 5.Be6 Bb8 6.Rxg7 Rd8 7.g3 > +- (1.41) Depth: 10/25 00:00:00 318kN >1...Qxc6 2.dxc6 Kf8 3.Ra7 Rc8 4.Rb7 Rc7 5.Rxb5 Ra7 6.Rd5 Ra1+ 7.Ke2 Ke7 > +- (1.44) Depth: 11/24 00:00:00 524kN >1...Qxc6 2.dxc6 Kf8 3.Ra7 Rc8 4.Rb7 Rc7 5.Rxb5 Ra7 6.Bd5 Ra1+ 7.Ke2 Ra2+ 8.Ke3 >Ra3 > +- (1.44) Depth: 12/24 00:00:01 932kN >1...Qxc6 2.dxc6 Rc8 3.Ra5 Ke7 4.Rxb5 h5 5.Rb7+ Rc7 6.Rb8 Rxc6 7.Rg8 Ra6 8.Rxg7+ >Kd8 > +- (1.53) Depth: 13/27 00:00:03 2028kN >1...Qxc6 2.dxc6 Rc8 3.Ra5 Ke7 4.Rxb5 h5 5.g3 Rb8 6.Ra5 Bc7 7.Rc5 Rd8 8.Rxc4 Rd2 > +- (1.53) Depth: 14/29 00:00:07 4389kN >1...Qxc6 2.dxc6 Rc8 3.Ra5 Ke7 4.Rxb5 h5 5.g3 Rb8 6.Ra5 Bc7 7.Rc5 Ra8 8.Rxc4 > +- (1.75) Depth: 15/30 00:00:14 8912kN >1...Qe3! > +- (1.72) Depth: 15/39 00:01:05 40910kN >1...Qe3 2.Qd7+ Kg8 3.Qxd6 Rf8 4.Qe6+ Kh7 5.Bf3 Qc1+ 6.Kf2 Qxc3 7.Qe7 Qd4+ 8.Ke1 >Rc8 > +- (1.69) Depth: 15/40 00:01:29 56295kN >1...Qe3! > +- (1.41) Depth: 16/42 00:02:53 110014kN >1...Qe3 2.Qd7+ Kg8 3.Qxd6 Rf8 4.Qe6+ Kh7 5.Bf3 Qc1+ 6.Kf2 Qxc3 7.Ra2 Qxb4 8.Be4 >Qc5+ > ± (1.22) Depth: 16/42 00:03:49 145577kN >1...Qe3 2.Qxd6 Re8 3.h4 h5 4.Bf3 Qc1+ 5.Kf2 Qd2+ 6.Be2 Qf4+ 7.Kg1 Qe3+ 8.Kh2 >Qf4+ > ± (1.25) Depth: 17/49 00:08:27 323011kN >1...Qe3! > ± (0.97) Depth: 18/49 00:18:43 710643kN >1...Qe3! > ² (0.69) Depth: 18/49 00:25:46 975479kN >1...Qe3 2.Qxd6 Re8 3.Qd7+ Re7 4.Qc6 Qxe4 5.d6 Qb1+ 6.Kf2 Qc2+ 7.Kg1 Qc1+ 8.Kh2 > ² (0.31) Depth: 18/49 00:35:53 1355370kN >1...Qe3-- > ² (0.59) Depth: 19/47 00:42:14 1600409kN >1...Qe3 2.Qxd6 Re8 3.h4 h5 4.Bf3 Qc1+ 5.Kf2 Qd2+ 6.Be2 Qf4+ 7.Kg1 Qe3+ 8.Kh2 >Qf4+ > ± (1.22) Depth: 19/55 01:53:29 4264751kN >1...Qe3! > ± (0.94) Depth: 20/53 02:38:59 5995729kN >1...Qe3! > ² (0.66) Depth: 20/53 03:21:02 7588724kN >1...Qe3 2.Qxd6 Re8 3.Qd7+ Re7 4.Qxb5 Qxe4 5.Ra1 Qd3+ 6.Kg1 Qxc3 7.Rd1 Qc2 8.Rf1 >Qe4 > = (0.22) Depth: 20/53 04:18:55 9774432kN >1...Qe3-- > ² (0.50) Depth: 21/53 04:58:54 11318969kN >1...Qe3 > ² (0.50) Depth: 21/60 15:05:30 34492009kN >1...Qe3 2.Qxd6 Re8 3.Qd7+ Re7 4.Qxb5 Qxe4 5.Ra1 Qxf5+ 6.Kg1 Qd3 7.d6 Qxd6 >8.Qxc4+ Kg6 > ² (0.34) Depth: 22/57 21:13:42 48416716kN > >(Celeron 1.2GHz, 832MB hash, 3, 4 & 5 piece EGTB's 12.02.2002) This result show that Fritz saw the draw when the 0.34 is only positional score that is not significant. If you look at the main line you can see that the side have equal material. I believe that Fritz can see that Qe3 is not winning a bishop for few pawns because it can see repetition in the relevant lines. It cannot see repetition in the main line that is posted when white sacrifices the bishop by 3.Qd7+ I believe that Fritz and part of the other top programs can see the 0.00 in less than an hour and at most 18 plies if you give them the position after 2.Qxd6 Re8 3.h4 and other lines when white does not sacrifice the bishop are more simple. If Fritz can see the draw in 18 plies after 3.h4 then it probably means that it could see also the draw from the original position in 22 plies. Uri
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