Author: Dann Corbit
Date: 19:24:56 02/22/00
Go up one level in this thread
On February 22, 2000 at 21:16:39, Paulo Soares wrote: >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 Actually, I am surprised (but not that it was Junior). However, you can see that Junior does not know it is a good move yet. Junior thinks that it is down one pawn instead of going to win. So it picked the right move, but it does not know why yet.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.