Author: Uri Blass
Date: 01:11:26 06/17/01
Are there top programs that are designed to see always simple tactics after enough time? Is it possible to change them to see always simple tactics after enough time when the price is only being 0.1% slower by using 2 engines when one engine is usually used only for only 0.1% of the time or maybe my math is wrong and only using another engine makes the program already more than 0.1% slower because of the fact that the program is bigger(even if the other engine is simply the original engine without null move pruning)? The position in the end of my post can happen in a game(it happened in an engine-engine game when I started from one of the position from my correspondence games). Deep Fritz could not see simple tactics because of null move pruning(with selectivity=0 Deep fritz has no problem to see more than 10 pawns advantage for black by Nc6 but with null move pruning Nc6 failed low again and again and fritz change it's mind to Ke3 when it is not clear if black can win after this move). I remember that Amir Ban said about other rare cases when Junior cannot see simple tactics that it is not a bug and I understand that he is not going to fix it so I wonder if there is a top program that is designed to see always simple tactics after enough time. New position [D]1n6/1P6/8/2P5/p3kp1p/6p1/1P4K1/4N3 b - - 0 1 Analysis by Deep Fritz: 1...a3-- ³ (-0.31) Depth: 1/3 00:00:00 1...a3-- ³ (-0.31) Depth: 1/3 00:00:00 1...f3+! ³ (-0.38) Depth: 1/3 00:00:00 1...h3+! ³ (-0.50) Depth: 1/3 00:00:00 1...h3+! 2.Kxh3 µ (-0.91) Depth: 1/3 00:00:00 1...Nc6! -+ (-1.69) Depth: 1/3 00:00:00 1...Nc6! -+ (-2.13) Depth: 1/3 00:00:00 1...Nc6-- -+ (-1.81) Depth: 2/4 00:00:00 1...Nc6-- -+ (-1.81) Depth: 2/4 00:00:00 1...Kd4! -+ (-2.09) Depth: 2/6 00:00:00 1...Kd4! 2.Nf3+ -+ (-2.22) Depth: 2/6 00:00:00 1...Kd4 2.Nf3+ Kxc5 3.Nxh4 -+ (-2.22) Depth: 3/8 00:00:00 1...Kd4 2.Nf3+ Kxc5 3.Nxh4 Kd5 -+ (-2.22) Depth: 4/10 00:00:00 1...Kd4 2.Nf3+ Kxc5 3.Nxh4 Kc6 4.Ng6 -+ (-1.97) Depth: 5/11 00:00:00 1...Kd4-- -+ (-1.66) Depth: 6/12 00:00:00 2kN 1...Kd4-- 2.Nf3+ Kxc5 3.Nxh4 Kc6 4.Ng6 Kxb7 -+ (-1.47) Depth: 6/13 00:00:00 2kN 1...Kd5! -+ (-1.50) Depth: 6/13 00:00:00 2kN 1...Kd5! 2.Nd3 Kd4 3.Nxf4 Kxc5 4.Ne6+ Kd6 -+ (-1.75) Depth: 6/13 00:00:00 3kN 1...Nc6! -+ (-1.78) Depth: 6/13 00:00:00 4kN 1...Nc6! 2.Kh3 f3 3.Nxf3 -+ (-2.13) Depth: 6/13 00:00:00 6kN 1...Nc6 2.Kh3 f3 3.Nxf3 Kxf3 4.Kxh4 g2 -+ (-2.41) Depth: 7/15 00:00:00 8kN 1...Nc6-- -+ (-2.09) Depth: 8/10 00:00:00 10kN 1...Nc6-- -+ (-2.09) Depth: 8/18 00:00:00 12kN 1...Nc6! -+ (-2.41) Depth: 9/17 00:00:00 28kN 1...Nc6-- -+ (-2.09) Depth: 10/14 00:00:00 37kN 1...Nc6-- -+ (-2.09) Depth: 10/19 00:00:00 45kN 1...Nc6! -+ (-2.41) Depth: 11/20 00:00:00 87kN 1...Nc6-- -+ (-2.09) Depth: 12/21 00:00:00 128kN 1...Nc6-- -+ (-2.09) Depth: 12/24 00:00:00 172kN 1...Nc6-- -+ (-1.78) Depth: 13/21 00:00:00 261kN 1...Nc6-- -+ (-1.78) Depth: 13/26 00:00:00 377kN 1...Nc6-- -+ (-1.47) Depth: 14/24 00:00:01 660kN 1...Nc6-- -+ (-1.47) Depth: 14/28 00:00:01 922kN 1...Nc6-- µ (-1.16) Depth: 15/27 00:00:02 1600kN 1...Nc6-- µ (-1.16) Depth: 15/30 00:00:03 2180kN 1...Nc6-- µ (-0.84) Depth: 16/29 00:00:05 3386kN 1...Nc6-- µ (-0.84) Depth: 16/30 00:00:06 4622kN 1...Ke3! µ (-0.88) Depth: 16/35 00:00:11 7839kN 1...Ke3! 2.Nc2+ Kd3 3.c6 Nxc6 4.Nb4+ Ke2 5.Nxc6 f3+ 6.Kh3 f2 7.b8Q µ (-0.97) Depth: 16/39 00:00:13 9840kN, tb=1 1...Ke3 2.Nc2+ Kd3 3.c6 Nxc6 4.Nb4+ Ke2 5.Nxc6 f3+ 6.Kh3 f2 7.b8Q µ (-0.88) Depth: 17/37 00:00:23 17184kN, tb=4 (blass, telaviv 16.06.2001) Uri
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