Author: Vincent Diepeveen
Date: 10:48:42 04/18/02
Go up one level in this thread
On April 18, 2002 at 02:22:22, Slater Wold wrote: 10(6) in the logs from Deep Blue means 10 ply total depth. See the article written at Deep Blue labatories >On April 17, 2002 at 22:14:55, Vine Smith wrote: > >>Good Lord, your machine is fast, fast, fast! What is it -- I think I saw one of >>your posts about this but can't quite remember, something like 2x1.7 GHz >Athlon? > >Dual AMD 1.73Ghz (Athlon XP+2100) - Asus A7M266-D Mobo - 1024MB RAM - 4x36.4GB >SCSI - GeForce 4 > >>It seems roughly 6x as quick as PIII-850 with Junior 7 (assuming Deep Junior 7 >>is much the same program), whereas I would have guessed only 4x. > >Deep Junior 7 is the same program. > >>The Shredder >>analysis was strange -- I guess this is the only program that improves on >slower >>hardware! Supporting this, there was a post by Nemeth that Shredder did not play >>the awful moves that led to its dismal defeat by Smirin on his slower system. > >Well, I think there's more to it. If you look at position A with 2 computers, >the evals will usually not be a *whole* lot different (granted you're using the >SAME exact program). I've actually tested my machine's eval using Deep Fritz vs >Deep Fritz on a P200. And the PVs are almost always exactly the same. However >there is a LOT of randomness in a SMP search. Branching is almost completly >random. > >>And then there's Crafty; every time I see it fail at a tactical problem, I gain >>greater respect for its positional abilities, since this MUST be the way it >>stays at the top (versus other non-professional programs, that is). > >Crafty is a terrific program. And I believe it has just as much positional >understanding as any "commercial" program, perhaps even more than some. >However, it does sometimes lack in tactics. > >>Rightly or >>wrongly, DB rejected Deep Fritz's eventual choice of 36...b5 after reaching >>depth 11(6) -- this had been DB's move at depth 10(6) [whatever that means; 16 >>full-width? 10 full, 6 selective? 10 with a selective component plus 6 >>full-width?]. > >Yes, I looked at the log. It looked at Rd7, b5, and eventually went with Kf8 >after only looking at it for a short period of time. > >All of Deep Blue's searchs were full width. What I have come to understand is >that 10(6) represents the (6) ply done in software and the 10 shows the ply in >HW. The first 6 ply were always done in software, and the remainder was always >done in HW. > >>Regards, >>Vine Smith
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.