Author: Robert Hyatt
Date: 11:44:01 09/19/05
Go up one level in this thread
On September 18, 2005 at 12:07:32, Uri Blass wrote: >On September 18, 2005 at 12:00:09, Vincent Diepeveen wrote: > >>On September 18, 2005 at 10:45:19, Robert Hyatt wrote: >> >># Name 1 2 3 4 5 P BU SB G >>1 Deep Thought II 2w1 5b0 7w1 3b1 5b1 4 13½ 11 5 >>2 Zarkov 1b0 6b1 4w1 5b= 3w1 3½ 15 9¾ 5 >>3 Star Socrates 10w1 7b1 5w1 1w0 2b0 3 12½ 5 5 >>4 Now 6w= 10b= 2b0 8w1 9b1 3 10½ 5½ 5 >>5 Mchess Pro 8b1 1w1 3b0 2w= 1w0 2½ 16½ 7¾ 5 >>6 Cray Blitz 4b= 2w0 9w1 7b0 10w1 2½ 11 4 5 >>7 Wchess 9w1 3w0 1b0 6w1 8b0 2 13½ 4½ 5 >>8 Evaluator 5w0 9b0 10w1 4b0 7w1 2 10 2½ 5 >>9 Innovation II 7b0 8w1 6b0 10b1 4w0 2 10 2½ 5 >>10 Spector 3b0 4w= 8b0 9w0 6b0 ½ 12½ 1½ 5 >> >>Zarkov from those days had no problems beating your 3 million nps Cray Blitz. >>Nor had Wchess problems beating your 3 million nps Cray Blitz. >> >>I remember how Wchess a few years ago was online at icc. Old Crafty had no >>problems beating it. >> >>Let's find those games somewhere in the archives... ...and see how strong >>Cray Blitz tactical was... >> >>Vincent > >The problem was bugs in cray blitz and the cray blitz that beated Crafty was >significantly better. > >Bob did not prove that the cray blitz that beated Crafty was not better than >deep thought(I believe that it was better but there is no point to argue about >it). > >Uri I will remind everyone, including Vincent (again) that the primary reason there is no longer a "Cray Blitz" is the difficulty of obtaining test time, to avoid these types of bugs. If we were lucky, we got to play 4-5 games per year before the annual ACM/WCCC events. We could test on non-Cray machines, using the pure FORTRAN version of the code, but the search depth was about 1/2 the depth we could reach on the Cray, which stressed the code much more than a shallow search on a vax. Not to mention the inability to test the cray assembly language at all except when running on a Cray. I simply got tired of the hassle, and decided to move to a more available platform, namely the PC-compatibles including non-PC workstations. It was a wise decision. Vincent only has to look at the troubles he had on the big NUMA box he used last year, and he apparently got more test time than we usually did. It just doesn't work... So there is no guarantee that the version that beat crafty had fewer bugs. It might well have had more. There were just not enough games to say. After 1000 games on ICC, I can be pretty sure my program won't crash during a game. But after just 5 I can't be sure of anything other than I just played 5 games...
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.