Author: Joshua Lee
Date: 06:32:49 01/18/03
Go up one level in this thread
On January 17, 2003 at 15:46:38, Jeremiah Penery wrote: >On January 17, 2003 at 14:54:30, Aaron Gordon wrote: > >>On January 17, 2003 at 12:45:45, Robert Hyatt wrote: >> >>>On January 17, 2003 at 10:42:33, Joshua Lee wrote: >>> >>>>bm axb5 - NOLOT #6 >>>>rnbqk2r/1p3ppp/p7/1NpPp3/QPP1P1n1/P4N2/4KbPP/R1B2B1R b kq - 0 1 >>>> >>>>Analysis by Fritz 7: >>>> >>>>1...Nd7 2.Nd6+ Kf8 3.Ng5 Nb6 4.Ndxf7 Kg8 >>>> = (-0.16) Depth: 6/35 00:00:00 366kN >>>>1...Nd7-- >>>> = (0.12) Depth: 7/28 00:00:00 391kN >>>>1...Nd7 2.Nd6+ Kf8 3.Nxc8 b5 4.cxb5 Rxc8 5.Qxa6 cxb4 >>>> ² (0.69) Depth: 7/28 00:00:00 427kN >>>>1...axb5! >>>> ² (0.66) Depth: 7/37 00:00:02 989kN >>>>1...axb5! >>>> ² (0.50) Depth: 7/37 00:00:02 992kN >>>>1...axb5! >>>> = (0.19) Depth: 7/37 00:00:02 999kN >>>>1...axb5 2.Qxa8 Na6 3.h3 Nc7 4.Qa5 >>>> = (0.09) Depth: 7/37 00:00:02 1004kN >>>>1...axb5-- >>>> ² (0.37) Depth: 8/31 00:00:02 1124kN >>>>1...axb5 >>>> ² (0.37) Depth: 8/31 00:00:02 1133kN >>>>1...axb5 2.Qxa8 Na6 3.cxb5 Nc7 4.Qb8 cxb4 5.axb4 f6 6.h3 >>>> ² (0.50) Depth: 9/30 00:00:06 2430kN >>>>1...axb5-- >>>> ± (0.78) Depth: 10/35 00:00:12 5037kN >>>>1...axb5 >>>> ± (0.78) Depth: 10/35 00:00:12 5093kN >>>>1...Nd7! >>>> ± (0.75) Depth: 10/35 00:00:13 5464kN >>>>1...Nd7 2.Nd6+ Kf8 3.Nxc8 b5 4.cxb5 Rxc8 5.h3 axb5 6.Qd1 >>>> ² (0.69) Depth: 10/35 00:00:13 5799kN >>>>1...Nd7 2.Nd6+ Kf8 3.h3 Nb6 4.Qe8+ Qxe8 5.Nxe8 Kxe8 6.hxg4 Bd4 7.Nxd4 exd4 >>>>8.bxc5 Nxc4 >>>> ² (0.50) Depth: 11/40 00:00:35 16021kN >>>>1...Nd7 2.Nd6+ Kf8 3.Nxc8 Ndf6 4.Qa5 Qxc8 5.h3 Bd4 6.Nxd4 cxd4 7.Kf3 Ne3 8.Bxe3 >>>>dxe3 >>>> ² (0.66) Depth: 12/39 00:01:01 28254kN >>>>1...Nd7! >>>> ² (0.37) Depth: 13/42 00:02:50 80884kN >>>>1...Nd7 2.Nd6+ Kf8 3.Nxc8 Bd4 4.Nxd4 exd4 5.Nd6 d3+ 6.Kxd3 Nf2+ 7.Kc2 Nxh1 >>>>8.Nxb7 Qe7 >>>> ² (0.31) Depth: 13/42 00:03:13 92105kN >>>>1...Nd7 2.Nd6+ Kf8 3.h3 Nb6 4.Nxb7 Bxb7 5.Qb3 Bd4 6.Nxd4 exd4 7.hxg4 Qf6 8.bxc5 >>>> ² (0.47) Depth: 14/43 00:06:54 200200kN >>>>1...Nd7 2.Nd6+ Kf8 3.h3 Nb6 4.Nxb7 Bxb7 5.Qb3 Bd4 6.Nxd4 exd4 7.hxg4 Qf6 8.bxc5 >>>> ² (0.47) Depth: 15/47 00:19:29 569978kN >>>>1...Nd7-- >>>> ± (0.75) Depth: 16/48 00:38:08 1119117kN >>>>1...Nd7 2.Nd6+ Kf8 3.h3 Nb6 4.Nxb7 Bxb7 5.Qb3 Nd7 6.hxg4 Bg3 7.Rh3 Bf4 8.Kf2 >>>> ± (0.81) Depth: 16/51 01:09:25 2057428kN >>>>1...axb5! >>>> ± (0.78) Depth: 16/51 01:14:45 2209222kN >>>>1...axb5! >>>> ² (0.62) Depth: 16/51 01:18:18 2310468kN >>>>1...axb5 2.Qxa8 Qc7 3.h3 Bd4 4.Ra2 Nf6 5.Nxd4 cxd4 6.Kf3 bxc4 7.Qa5 Qxa5 8.bxa5 >>>> ² (0.41) Depth: 16/51 01:28:34 2601340kN >>>>1...axb5 2.Qxa8 Qc7 3.h3 Bd4 4.Ra2 Nf6 5.Nxd4 cxd4 6.Kf3 bxc4 7.Qa5 Qxa5 >>>> ² (0.34) Depth: 17/50 03:11:19 5594783kN >>>>1...axb5 2.Qxa8 Qc7 3.Rb1 Bd4 4.bxc5 Qxc5 5.Qxb8 0-0 6.Rb4 Nf2 7.Nxd4 Nxh1 >>>>8.Qxe5 >>>> ² (0.37) Depth: 18/55 07:10:51 12610578kN >>>> >>>>(Lee, Kingpawn 07.01.2003) >>> >>> >>>That doesn't look "solved". IE .37 is not winning anything. The score seems to >>>be >>>dropping iteration by iteration in fact... which causes the best move to change, >>>but maybe >>>not for the right reason. >> >>How do we know that the person that played the move in the first place didn't >>see something else and then see the winning line later a few moves after playing >>axb5? The GM could have been playing through for the same reasons Fritz was and >>only later found that it was infact winning. > >It was a big home preparation line. It's not all _that_ hard for a computer to >think that axb5 is the best move in the position, but finding the next move, >Bd4, is probably too difficult for any computer today. Certainly, they won't >find it with any kind of decent score. The line Fritz gives there is pretty >pointless, and isn't going to win anything. I was mpressed that it found the move and kept it for seven hours. It's not a -+ score but it did find the move and i hven't heard of anybody else saying that a program found the move. In reality to see Bd4 or to see a plus score i think i figured out that a program would have to search to a (fritz equivalent) depth somewhere 30ply or more maybe 25. Next week i'll let it try again on my new computer
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