Author: Martin
Date: 04:04:16 02/23/00
Go up one level in this thread
On February 22, 2000 at 19:40:26, Dann Corbit wrote: >On February 22, 2000 at 19:13:10, Howard Exner wrote: >[snip] >>>Here is the CAP record. It was not solved at normal time controls. >> >>I usually limit the serch on my K2-233 to 10 minutes. For that time Rebel >>Century 1.2 did not come up with b2 either. What time do you limit the search to >>for Crafty? > >Approximately 12 minutes of PII 300 MHz CPU time. > >>I'm guessing that someone will post a program finding this. I used the word >>"tough" in the header thinking that it would be tough for computers but am >>hoping someone will post that program X finds it. Maybe Hiarcs or Tiger?Probably >>not so tough for a human since the b3b2 followed by exf4 is fairly linear. >> >[D]8/6Bp/6p1/2k1p3/4PPP1/1pb4P/8/2K5 b - - > >I am guessing that NULL move pruning programs will not see the solution because >you have to throw away the bishop, and you do not benefit instantly after that. > >Here is one of those things where it is much easier for a human to see the >answer than for a computer. > >I will be surprised if any program solves it in less than one hour. On a rather slow machine (PII, 233MHz, 8MB Hash) Hiarcs finds this move in less than 62 minutes. Not really good indeed, even on a PIII-500 this would mean that it needs far more than the average tournament time of 3 min... Analysis by Hiarcs 7.32: 1...Kd6 2.f5 ³ (-0.31) Tiefe: 1 00:00:00 1...b2+ 2.Kc2 ³ (-0.48) Tiefe: 3/12 00:00:00 1...b2+ 2.Kc2 ³ (-0.48) Tiefe: 3/12 00:00:00 1...b2+ 2.Kc2 ³ (-0.48) Tiefe: 3/12 00:00:00 1...b2+ 2.Kc2 ³ (-0.48) Tiefe: 3/12 00:00:00 1...b2+ 2.Kb1 Kd6 3.f5 ³ (-0.34) Tiefe: 3/12 00:00:00 1...b2+ 2.Kb1 Kd6 3.f5 Ke7 ³ (-0.27) Tiefe: 4/13 00:00:00 1...Kd6 2.f5 Ke7 3.h4 ³ (-0.29) Tiefe: 4/14 00:00:00 1...Kd6 2.f5 gxf5 3.gxf5 Ke7 4.Kb1 = (-0.16) Tiefe: 5/14 00:00:00 16kN 1...Kd6 2.f5 gxf5 3.gxf5 Ke7 4.Kb1 Kf7 = (-0.23) Tiefe: 6/16 00:00:01 50kN 1...Kd6 2.f5 gxf5 3.gxf5 Ke7 4.Kb1 Kf7 5.Lh6 ³ (-0.34) Tiefe: 7/20 00:00:04 155kN 1...Kd6 2.f5 gxf5 3.Lf8+ Ke6 4.gxf5+ ³ (-0.26) Tiefe: 8/22 00:00:13 455kN 1...Kd6 2.f5 gxf5 3.Lf8+ Ke6 4.gxf5+ Kf6 5.La3 Ld4 6.Lb2 Le3+ 7.Kd1 = (-0.25) Tiefe: 9/25 00:00:35 1217kN 1...Kd6 2.f5 gxf5 3.Lf8+ Ke6 4.gxf5+ Kf6 5.Ld6 h5 6.La3 Ld4 7.Lb2 ³ (-0.27) Tiefe: 10/25 00:01:34 3176kN 1...Kd6 2.f5 gxf5 3.Lf8+ Ke6 4.gxf5+ Kf7 5.La3 Ld4 6.Lb2 Le3+ 7.Kb1 Kf6 8.h4 h5 = (-0.18) Tiefe: 11/30 00:04:04 8285kN 1...Kd6 2.f5 gxf5 3.Lf8+ Ke6 4.gxf5+ Kf7 5.La3 Kf6 6.Kb1 h5 7.Lc1 Ld4 8.Lb2 Lc5 = (-0.17) Tiefe: 12/30 00:12:10 24620kN, tb=1 1...Kd6 2.f5 gxf5 3.Lf8+ Ke6 4.gxf5+ Kf7 5.La3 Kf6 6.Lb2 Lb4 7.Kb1 Ld2 8.Lc1 Lf4 9.Kb2 Lxc1+ 10.Kxc1 = (-0.05) Tiefe: 13/30 00:42:19 85016kN, tb=11 1...b2+ 2.Kb1 exf4 3.Lxc3 f3 4.Le1 Kd4 5.e5 Kxe5 6.Kxb2 Ke4 7.g5 ³ (-0.26) Tiefe: 13/30 01:01:56 123118kN, tb=12 Martin
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