Author: stuart taylor
Date: 19:21:36 11/17/03
Go up one level in this thread
On November 17, 2003 at 21:17:37, Kevin Heider wrote: >After watching Fritz not play either f5 or h5 in game 3, I have to say that >Deeper Blue (DB2) was the best chess computer EVER. Even with a better >evaluation algorithm; Fritz at 4m nods/sec can NOT be as strong as DB2 at 200m >nods/sec. > >DB2 simply knew when it had to start mixing it up. > >I took the position from Move 37 of Game #2 of Deeper Blue vs Kasparov. This is >the position where Gary claimed that someone (Karpov?) was feeding DB some of >it's moves. Gary could not believe it when DB played Be4! blocking the black >e-pawn from advancing. > >I had Rebel XP start an infinite search on my DURON 1100MHZ and it took almost >20 hours to find 37 Be4! (The move Gary claims a computer would never come up >with) > >Granted different programs do different searches/evaluations, but if Be4 is as >positionally strong as Gary claims then a lot of programs should like it after a >very deep search. > >If I assume: > >1. Rebel / Fritz / Junior / Shredder are of roughly equal strength > >2. DB took 10 minutes to find Be4 > >then I can conclude that X3D Fritz needs a better function or needs to run >(20hr*60m/10m) 120x faster to play at DB2 strength. > >Since I only own Rebel: Has anyone recently checked this famous position to see >if Fritz, Junior, or Shredder like the position after a deep think? > >Rebel XP's lines: >01:58:56 19.00 Qb6 Rxa2 Rxa2 >08:14:57 20.00 Qb6 Rxa2 >19:26:24 20.05 Be4 Rcb8 >32:42:43 21.00 Be4 Rcb8 Ra6 Qc8 Qa2 > >You will also notice on the right side of my screen grab that Rebel's 4th >favorite variation shows that if 37. Ra6 e4! Qe3 > >You can see a screen grab of the analysis at: >http://home.comcast.net/~kpheider/DB2BE4.GIF > >-- Kevin Heider I didn't realize that Kasparov was speaking highly of Be4, only that it looked non-computer-like. Anyway, that is also only one example, and may be an example which speed answers (but wasn't it true that Kasparov missed the draw AFTER that?). But there may be more things which are answered without speed, which are pesent in todays top software on todays hardware. S.Taylor
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