Author: Paulo Soares
Date: 18:16:39 02/22/00
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. Then you can be surprised. Junior6(no upgrade, default settings) on a PIII450 with HT=127Mb. 8/6Bp/6p1/2k1p3/4PPP1/1pb4P/8/2K5 b - - 0 1 Analysis by Junior 6.0: 1...Kd6 2.f5 gxf5 3.exf5 b2+ 4.Kc2 Bd4 = (0.02) depth: 6 00:00:00 5kN 1...Kd6 2.f5 Ke7 3.f6+ Ke6 4.h4 b2+ 5.Kc2 Bd4 = (-0.16) depth: 9 00:00:00 71kN 1...Kd6 2.Kb1 Ke6 3.Bh8 Bd4 4.f5+ Kf7 5.f6 = (-0.15) depth: 12 00:00:01 417kN 1...Kd6 2.Bf8+ Ke6 3.f5+ gxf5 4.gxf5+ Kf7 5.Ba3 Kf6 6.Bb2 Bd4 7.h4 h5 8.Kb1 Bxb2 = (-0.15) depth: 15 00:00:05 1662kN 1...Kd6 2.Bf8+ Ke6 3.f5+ Kf6 4.Ba3 Bd4 5.Bb2 Be3+ 6.Kb1 gxf5 7.gxf5 Bf2 = (-0.11) depth: 18 00:00:34 11194kN 1...Kd6 2.Bf8+ Ke6 3.f5+ Kf6 4.Ba3 gxf5 5.gxf5 h5 6.Bc5 Kf7 7.Ba3 = (-0.09) depth: 21 00:01:37 29268kN 1...Kd6 2.Bf8+ Ke6 3.f5+ Kf6 4.Ba3 gxf5 5.gxf5 h5 6.Bb2 Bb4 7.Kb1 Bc5 8.Bc1 Bd4 9.Bb2 = (-0.07) depth: 23 00:05:04 85655kN 1...b2+! ³ (-0.39) depth: 23 00:05:57 99774kN 1...b2+! ³ (-0.69) depth: 25 00:10:30 174103kN 1...b2+ 2.Kc2 exf4 3.Bxc3 f3 4.Be1 Kd4 5.Bh4 b1B+ 6.Kxb1 Kxe4 7.Bf2 Kd3 8.h4 Ke2 9.Bd4 h6 10.Bg1 f2 µ (-0.95) depth: 25 00:14:01 231242kN (Soares, Cabo Frio 22.02.2000)
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