Author: Uri Blass
Date: 09:29:16 05/08/03
Go up one level in this thread
On May 08, 2003 at 12:23:19, Will Singleton wrote: >On May 08, 2003 at 11:13:22, Brian Thomas wrote: > >>This was posted on Chessbase's site -- this is page 7: >> >>http://www.xbitlabs.com/articles/editorial/display/chess_7.html >> >>Does any engine not play Ra6? >> >>Brian > >[D]Rr6/5kp1/1qQb1p1p/1p1PpP2/1Pp1B3/2P4P/6P1/5K2 w - - > >Analysis by Shredder 7: > >1.Qxb6 Rxb6 > ² (0.58) Depth: 1/2 00:00:00 >1.Qxb6 Rxb6 2.Ra7+ Be7 > ² (0.67) Depth: 2/6 00:00:00 >1.Qd7+ Kg8 2.Ra7 > ± (0.89) Depth: 2/6 00:00:00 >1.Qd7+ Kg8 2.Ra7 > ± (0.89) Depth: 2/8 00:00:00 >1.Qd7+ Kg8 2.Ra7 Bf8 > ± (1.14) Depth: 3/7 00:00:00 >1.Qd7+ Kg8 2.Ra7 Bf8 3.Qf7+ Kh8 > ± (1.37) Depth: 3/8 00:00:00 >1.Qd7+ Kg8 2.Ra7 Bf8 3.Qf7+ Kh8 > ± (1.37) Depth: 4/9 00:00:00 >1.Qd7+ Kg8 2.Ra7 Bf8 3.Qe6+ Kh8 4.Qxb6 Rxb6 > ± (1.25) Depth: 5/10 00:00:00 >1.Qd7+ Kg8 2.Ra7 Bf8 3.Qe6+ Kh7 4.Qxb6 Rxb6 5.g4 Rd6 > ± (1.19) Depth: 6/13 00:00:00 >1.Qd7+ Kg8 2.Ra7 Bf8 3.d6 Qxd6 4.Qf7+ Kh8 5.Bd5 e4 6.Bxe4 > ± (1.12) Depth: 7/15 00:00:00 31kN >1.Ra6 Qxc6 2.dxc6 Rd8 3.Ra7+ Kg8 > ± (1.13) Depth: 7/16 00:00:00 44kN >1.Ra6 Qxc6 2.dxc6 Kf8 3.Ra7 Rd8 4.Kf2 > ± (1.34) Depth: 7/23 00:00:00 61kN >1.Ra6 Qxc6 2.dxc6 Kf8 3.Ra7 Re8 4.g4 Rd8 5.Ke2 g6 > ± (1.32) Depth: 8/16 00:00:00 81kN >1.Ra6 Qxc6 2.dxc6 Kf8 3.Ra7 Rc8 > +- (1.51) Depth: 9/23 00:00:00 172kN >1.Qd7+ Kg8 2.Ra7 Bf8 3.d6 Kh8 4.Qf7 Rd8 5.Bd5 Qxd6 6.Qg8# > +- (1.52) Depth: 9/23 00:00:00 199kN >1.Qd7+ Kg8 2.Ra7 Bf8 3.Qf7+ Kh7 4.d6 Qe3 5.Bd5 Qc1+ 6.Kf2 Qf4+ 7.Ke1 Qxf5 8.Qg6+ >Qxg6 > +- (1.53) Depth: 9/25 00:00:00 253kN >1.Qd7+ Kg8 2.Ra7 Bf8 3.Qf7+ Kh8 4.d6 Qe3 5.Bd5 Qc1+ 6.Kf2 Qd2+ 7.Kf3 Qxc3+ 8.Kf2 >e4 9.Qxf6 Qxf6 > ± (1.28) Depth: 10/27 00:00:01 379kN >1.Qd7+ Kg8 2.Ra7 Bf8 3.Qe6+ Kh7 4.Qxb6 Rxb6 5.g4 Bd6 6.Ke2 Bb8 7.Re7 Ra6 > ± (1.20) Depth: 10/27 00:00:01 517kN >1.Ra6 Qxc6 2.dxc6 Kf8 3.Ra7 Be7 > ± (1.21) Depth: 10/27 00:00:01 544kN >1.Ra6 Qxc6 2.dxc6 Kf8 3.Ra7 Be7 4.g4 Rd8 5.c7 Kf7 6.cxd8Q > +- (1.56) Depth: 10/27 00:00:01 614kN >1.Ra6 Qxc6 2.dxc6 Kf8 3.Ra7 Re8 4.Rd7 Be7 5.Rb7 Bd6 > +- (1.68) Depth: 10/27 00:00:02 749kN >1.Ra6 Qxc6 2.dxc6 Kf8 3.Ra7 Rc8 4.Rb7 Rc7 5.Rxb5 Ra7 6.Rd5 Ra1+ 7.Ke2 Ke7 > +- (1.90) Depth: 11/28 00:00:03 1098kN >1.Ra6 Qxc6 2.dxc6 Kf8 3.Ra7 Rc8 4.Rb7 Rc7 5.Rxb5 Ra7 6.Bd5 Be7 7.Bxc4 > +- (2.15) Depth: 12/26 00:00:04 1814kN >1.Ra6 Qxc6 2.dxc6 Kf8 3.Ra7 Rc8 4.Rb7 Rc7 5.Rxb5 Ra7 6.Bd5 Be7 7.Bxc4 Ke8 > +- (2.18) Depth: 12/26 00:00:05 2011kN >1.Ra6 Qxc6 2.dxc6 Kf8 3.Ra7 Rc8 4.Rb7 Rc7 5.Rxb5 Ra7 6.Bd5 Ra1+ 7.Kf2 Ra2+ 8.Kf3 >Rc2 9.Rb7 Rxc3+ 10.Ke4 > +- (2.33) Depth: 13/31 00:00:08 3471kN >1.Ra6 Qxc6 2.dxc6 Kf8 3.Ra7 Rc8 4.Rb7 h5 5.Rxb5 Ke7 6.Bd5 Rb8 7.Rxb8 Bc7 > +- (2.34) Depth: 14/35 00:00:14 5713kN >1.Ra6 Qe3 2.Qd7+ Kg8 3.Qxd6 Rf8 4.Qe6+ Kh8 5.Qe7 Rg8 6.Bf3 Qc1+ 7.Kf2 Qd2+ 8.Be2 >Qf4+ 9.Kg1 Qe3+ 10.Kh2 Qxe2 11.Rxf6 gxf6 12.Qxf6+ Kh7 13.Qxh6+ > +- (2.09) Depth: 15/45 00:01:29 33972kN >1.Ra6 Qe3 2.Qd7+ Kg8 3.Qxd6 Rf8 4.Qe6+ Kh8 5.Qe7 Rg8 6.Bf3 Qc1+ 7.Kf2 Qd2+ 8.Be2 >Qf4+ 9.Kg1 Qe3+ 10.Kh2 Qxe2 11.Rxf6 > +- (1.59) Depth: 15/45 00:02:16 51412kN >1.Ra6 Qe3 2.Qxd6 Re8 3.Qd7+ Re7 4.Qc6 Qxe4 5.d6 Qb1+ 6.Kf2 Qxf5+ 7.Kg1 Rd7 >8.Qxb5 Qe6 9.Qc5 > ² (0.49) Depth: 15/45 00:04:18 93569kN >1.Qd7+ Kg8 2.Ra7 Bf8 3.Qe6+ Kh7 4.Qxb6 Rxb6 5.Kf2 Bxb4 6.cxb4 Rb7 7.Rxb7 > ² (0.50) Depth: 15/45 00:04:20 94479kN >1.Qd7+ Kg8 2.Ra7 Bf8 3.Qe6+ Kh7 4.Qxb6 Rxb6 5.Kf2 Bxb4 6.cxb4 Ra6 7.Rxa6 > ± (0.85) Depth: 15/45 00:04:22 95104kN >1.Qd7+ Kg8 2.Ra7 Bf8 3.Qf7+ Kh7 4.Ke2 Rd8 5.Qb7 Rb8 6.Qxb6 Rxb6 7.g4 Bd6 8.h4 >Bb8 > ± (1.20) Depth: 15/45 00:05:06 110658kN >1.Qd7+ Kg8 2.Ra7 Bf8 3.Ke2 Kh7 4.g4 Qg1 5.Qc7 Qh2+ 6.Kd1 Qg1+ 7.Kd2 Qf2+ 8.Kc1 >Qe1+ 9.Kb2 Qd2+ > ± (1.11) Depth: 16/46 00:08:20 178225kN >1.Qd7+ Kg8 2.Ra7 Bf8 3.Qf7+ Kh7 4.Ke2 Qg1 5.Qc7 Qb6 6.Qxb6 Rxb6 7.g4 Bd6 8.Kf3 >Bb8 9.Ra8 > ± (1.19) Depth: 17/45 00:14:59 321142kN >1.Qd7+ Kg8 2.Ra7 Bf8 3.d6 Qe3 4.Qf7+ Kh8 5.Bd5 Qc1+ 6.Kf2 Qd2+ 7.Kg1 Qc1+ 8.Kh2 >Qf4+ 9.g3 Qf2+ 10.Bg2 Rd8 11.Rc7 e4 12.d7 Qb6 13.Rc8 > +- (1.43) Depth: 18/52 00:31:23 678530kN I remember that shredder is not the only program that does not play Ra6 but I doubt if white has a win. I was not convinced that Qxb6 is winning for white. Uri
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