Author: John Merlino
Date: 20:55:58 07/24/02
Go up one level in this thread
On July 24, 2002 at 23:34:17, Slater Wold wrote: >[D]1N4br/3pkPp1/6PP/8/pp3P2/8/P4r1P/6K1 w - - 0 1' > >Every program I tested found the correct move in about 5 seconds. > >Every program I tested then failed low for 10-13 ply. > > >The real test here is not "finding" the move. But finding that it's winning. > >How long does it take your program to find hxg7, and _know_ it's winning? Chessmaster 9000 (PIII-600) finds the move instantly, and DOES fail low at ply 10. After that, the eval stays steady through to ply 13. Time Depth Score Positions Moves 0:00 1/3 3.32 1973 1.hxg7 Rhxh2 2.f8=Q+ Ke6 3.Qxg8+ Kd6 0:00 1/4 4.70 9531 1.hxg7 Rg2+ 2.Kxg2 Rxh2+ 3.Kxh2 Bxf7 4.gxf7 Kxf7 0:00 1/5 4.40 16406 1.hxg7 Rg2+ 2.Kxg2 Rxh2+ 3.Kxh2 Bxf7 4.gxf7 Kxf7 5.Kg3 Kxg7 6.Nxd7 0:01 1/6 4.40 74263 1.hxg7 Rg2+ 2.Kxg2 Rxh2+ 3.Kxh2 Bxf7 4.gxf7 Kxf7 5.Kg3 Kxg7 6.Nxd7 0:01 1/7 4.39 87914 1.hxg7 Rg2+ 2.Kxg2 Rxh2+ 3.Kxh2 Bxf7 4.gxf7 Kxf7 5.Nxd7 Kxg7 6.Kg3 Kg6 0:02 2/8 4.42 124497 1.hxg7 Rg2+ 2.Kxg2 Rxh2+ 3.Kxh2 Bxf7 4.gxf7 Kxf7 5.Nxd7 Kxg7 6.Kg3 b3 0:02 3/9 3.80 203060 1.hxg7 Rg2+ 2.Kxg2 Rxh2+ 3.Kxh2 Bxf7 4.gxf7 Kxf7 5.Nxd7 b3 6.Nf6 Kxg7 7.Ne8+ Kg6 0:05 4/10 2.01 422430 1.hxg7 Rg2+ 2.Kxg2 Rxh2+ 3.Kxh2 Bxf7 4.gxf7 Kxf7 5.Nxd7 b3 6.axb3 axb3 7.Ne5+ Kxg7 8.Nc4 Kf6 0:33 5/11 2.00 2574161 1.hxg7 Rg2+ 2.Kxg2 Rxh2+ 3.Kxh2 Bxf7 4.gxf7 Kxf7 5.Nxd7 b3 6.axb3 axb3 7.Ne5+ Kxg7 8.Nc4 Kf6 9.Kg3 1:05 6/12 2.07 5089526 1.hxg7 Rg2+ 2.Kxg2 Rxh2+ 3.Kxh2 Bxf7 4.gxf7 Kxf7 5.Nxd7 b3 6.axb3 axb3 7.Ne5+ Kxg7 8.Nc4 Kf6 9.Kg3 Ke6 3:04 7/13 2.03 14522913 1.hxg7 Rg2+ 2.Kxg2 Rxh2+ 3.Kxh2 Bxf7 4.gxf7 Kxf7 5.Nxd7 b3 6.axb3 axb3 7.Ne5+ Kxg7 8.Nc4 Kf6 9.Kg3 Ke6 10.Nb2 HOWEVER, hxg7 still appears to lose anyway! After forcing CM9000's main line of 1.hxg7 Rg2+ 2.Kxg2 Rxh2+ 3.Kxh2 Bxf7 4.gxf7 Kxf7 (and you should agree that all of White's moves are forced), we get this position: [D]1N6/3p1kP1/8/8/pp3P2/8/P6K/8 w - - 0 5 And Chessmaster says this: Time Depth Score Positions Moves 0:00 1/3 3.06 356 5.Kg3 b3 6.Nxd7 bxa2 0:00 1/3 4.38 392 5.Nxd7 Kxg7 6.Kg3 Kg6 0:00 1/4 4.41 945 5.Nxd7 Kxg7 6.Kg3 b3 0:00 1/5 3.77 4520 5.Nxd7 b3 6.Nf6 Kxg7 7.Ne8+ Kg6 0:00 2/6 2.00 11934 5.Nxd7 b3 6.axb3 axb3 7.Ne5+ Kxg7 8.Nc4 Kf6 0:00 3/7 1.99 25482 5.Nxd7 b3 6.axb3 axb3 7.Ne5+ Kxg7 8.Nc4 Kf6 9.Kg3 0:00 4/8 2.06 50786 5.Nxd7 b3 6.axb3 axb3 7.Ne5+ Kxg7 8.Nc4 Kf6 9.Kg3 Ke6 0:00 5/9 2.01 99429 5.Nxd7 b3 6.axb3 axb3 7.Ne5+ Kxg7 8.Nc4 Kf6 9.Kg3 Ke6 10.Nb2 0:02 6/10 -2.43 204435 5.Nxd7 b3 6.axb3 a3 7.b4 a2 8.b5 a1=Q 9.b6 Qxg7 10.Kh3 Ke6 0:04 7/11 -3.32 479598 5.Nxd7 b3 6.axb3 a3 7.Nf6 Kxg7 8.Ne8+ Kf8 9.Nd6 a2 10.b4 a1=Q 11.b5 Qd4 0:07 8/12 -3.73 740137 5.Nxd7 b3 6.axb3 a3 7.Nf6 Kxg7 8.Ne8+ Kf8 9.Nc7 a2 10.Ne6+ Ke7 11.Nd4 a1=Q 12.Nc6+ Kd6 13.Ne5 0:13 9/13 -4.20 1263381 5.Nxd7 b3 6.axb3 a3 7.Nf6 Kxg7 8.Ne8+ Kf8 9.Nf6 a2 10.Nh7+ Kg7 11.Ng5 a1=Q 12.Ne6+ Kf6 13.Nc5 Qd4 0:24 10/14 -4.44 2318389 5.Nxd7 b3 6.axb3 a3 7.Nf6 Kxg7 8.Nh5+ Kf8 9.f5 a2 10.Nf4 a1=Q 11.Kh3 Qc3+ 12.Kg4 Kf7 13.Ne6 Qxb3 0:47 11/15 -4.52 4484987 5.Nxd7 b3 6.axb3 a3 7.g8=Q+ Kxg8 8.Kh3 a2 9.Kg4 a1=Q 10.Ne5 Qd1+ 11.Kg5 Qxb3 12.f5 Qe3+ 13.Kf6 Qh6+ 14.Ng6 Qg7+ 15.Ke6 Qf7+ 16.Ke5 1:09 12/16 -4.60 6779430 5.Nxd7 b3 6.axb3 a3 7.g8=Q+ Kxg8 8.Kh3 a2 9.Kg4 a1=Q 10.Ne5 Qd1+ 11.Kg5 Qxb3 12.f5 Qd5 13.Ng6 Qd2+ 14.Kf6 Qd6+ 15.Kg5 Kg7 Is CM9000 missing something? jm
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.