Author: Mike S.
Date: 14:05:54 11/25/01
Go up one level in this thread
On November 25, 2001 at 15:14:16, Victor Fernandez wrote: >(...) >Yes, an example: an ending with few pieces . > >Kotov-Botvinnik >[D]8/8/4b1p1/2Bp3p/5P1P/1pK1Pk2/8/8 b - - 0 1 >The correct move is ...g5 !!! Few programs play this. You're right. This position was used as #18 in the BS-2830 computer test suite. I don't have detailed results available at the moment, but Shep lists #18 as unsolved on his site: http://chessportal.multimania.com/index.php?section=suites&subsection=suite_results#bs_2830 Meanwhile, another test was issued which includes a position from the same game, but 2 plies later where the 2nd pawn sacrifice must be found: 33: Kotov - Botvinnik Moskau, 1955 [D]8/8/4b3/2Bp2Pp/7P/1pK1Pk2/8/8 b - - 0 1 1...d4+! 2.exd4 [2.Lxd4 Kg4 3.g6 Kxh4 4.g7 Kh3! 5.Lf6 h4-+] 2...Kg3 3.La3 [3.g6 Kxh4 4.g7 Kh3 5.Le7 h4-+] 3...Kxh4-+ 0-1 This is #33 of the CSS-WM-Test. Solving times/TB 1400 MHz range from 0:00 to >10:00. But I think this isn't a knowledge example... to me it looks more like a test of speed, or raw computing power, so to speak. Analysis by Hiarcs 7.32 (P3/700): 1...Kg4 2.g6 Kf5 3.g7 Kg6 4.Kxb3 Kxg7 5.Bd4+ Kg6 = (0.09) Depth: 1 00:00:00 = (0.06) Depth: 4/12 00:00:00 1...Bf7 2.Kb2 Kg3 3.Be7 Kg4 4.Bf6 Bg8 5.Kc3 Kxh4 6.g6+ Kg4 7.Kxb3 = (-0.01) Depth: 4/13 00:00:00 = (0.00) Depth: 9/20 00:00:03 427kN 1...Kg4 2.Kxb3 Kxh4 3.Be7 Kg3 4.Kc3 h4 5.Bd6+ Kf3 6.Kd4 = (-0.01) Depth: 9/21 00:00:05 743kN 1...d4+ 2.Bxd4 Kg3 3.g6 Kxh4 4.g7 Kg3 5.Be5+ Kg4 6.Kd3 h4 7.Ke2 h3 = (-0.04) Depth: 9/26 00:00:07 923kN = (-0.14) Depth: 12/30 00:00:57 7672kN Regards, M.Scheidl
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