Author: Robert Hyatt
Date: 07:16:25 08/02/01
Go up one level in this thread
On August 02, 2001 at 09:31:34, Vincent Diepeveen wrote: >On August 02, 2001 at 08:53:38, Robert Hyatt wrote: > >>On August 02, 2001 at 03:56:58, Dann Corbit wrote: >> >>>On August 02, 2001 at 03:32:12, Joshua Lee wrote: >>> >>>>Since Deep Blue isn't around playing games these days the only "Real" >>>>Competition That is on the level of DeepThought or Blue would be Cray Blitz. >>>>How does CB compare to the Deep's? I know DT could be searching 10Ply find a >>>>move but a regular Fritz might take 20+ ply I am guessing that CB is closer to >>>>the Deep's than your average program ... What kind of differences between Cray >>>>and Commercials are there in eval "IF" that's a BIG "IF" eval is the main >>>>difference between the two. How much memory went to Hash Tables etc? Is the >>>>Depth = to Crafty only just deeper in searches? In other words is 12ply for CB >>>>the same as Crafty? I played a game Between Fritz and Crafty at 12ply each and >>>>then 12ply for Crafty and 14 for Fritz , Fritz lost both not that this says >>>>much as Fritz at 12 ply took tops 1:30 while Crafty took up to 30 minutes but at >>>>14 Ply for Fritz it was not enough in the endgame. I don't know how much Depth >>>>is good for fritz but it looks like 12Ply is a decent minimum for Crafty for >>>>most positions except in the endgame. >>>> >>>>Also i asked about the games of Crafty Vs Cray Blitz when will these be >>>>available? >>> >>>Cray blitz had memory bandwidth as a big advantage. But personally, I think the >>>8 way SMP boxes running Junior or Fritz would give cray blitz all it could >>>handle. >>> >>>On the other hand, put crafty on a 64 way SMP Compaq Alpha machine, and only >>>Deep Blue would have a chance against it. >>> >>>Pure speculation, of course. > >Is there any possibility to play a testgame(s) DIEP vs cray blitz >somehow? It is not easy to arrange. I played 10 games vs crafty last year and crafty did poorly. No reason to believe Diep will do better. And that was against a "stock" cray blitz. It would take 10 minutes to change it to use R=2 and recursive null-move. Another 10 to make it use the current adaptive R=3~2 null-move. > >If i understood well, you got like 11 to 12 ply with Cray Blitz, >just what i get with diep at a dual machine? > 11-12 plies with null move, R=1, non-recursive (only one null move allowed in any single path between the root and the tip). >>I would disagree. Cray Blitz was very similar to crafty, other than it didn't >>use recursive null-move or R=2. But those would be tiny changes to enable. And >>it would then be searching just like Crafty, just at 7M nodes per second >>rather than 1M... >> >>And CB had some eval things that I can't do in crafty due to memory bandwidth >>limits... > >I do not see the connection between evaluation code and needing bandwidth >for it. As far as i know evaluation has only to do with the way the >processor is working. Isn't that the case here? Nope. Bandwidth to match patterns. To load the entire contents of diagonals, ranks, files. To compute "quality mobility". Etc. > >Best regards, >Vincent
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