Author: Robert Hyatt
Date: 11:29:05 05/07/01
Go up one level in this thread
On May 07, 2001 at 12:40:22, Uri Blass wrote: > >For me difference of more than +2 in the evaluation of Deeper blue and Crafty is >convincing. > >I am not talking about the difference of 1.7 and 1.4. >There is even a difference of more than 1 pawn between Deep Fritz's evaluation >and Crafty's evaluation but Fritz can find the right pv. Just listen to what you just said. There is a difference of more than one pawn but DF has the right PV. With DB you can _not_ see the PV. The first moves are probably reasonable. The moves at the end might or might not be reasonable, and the last 6 plies + extensions + captures are not seen _ever_. Which simply shows that you can _not_ compare DB to _anything_ without all the information... > >I cannot say 1.7 of Crafty is better than 1.4 of Deeper blue but I can say that >4.x of Crafty and 3.x of other programs are better than 1.x of deeper blue and >the evaluation of deeper blue was 1.x if you look at depth 15(the depth that >Crafty found the line with Ke3) Count the pieces on the board, then look at king safety, and everything else. Then you can _guess_ at what DB was evaluating compared to Crafty and the other micro programs. But you can only _guess_. You are assuming they are seeing _less_. What if they are seeing _more_??? How can you tell they aren't? You can't. It is _all_ a guess... > >I am almost sure that Crafty can beat Deeper blue if Crafty searches the same >depthes that deeper blue searched and my guess is that Crafty on an alpha is >clearly better than deeper blue. > >Uri Not a chance. It would be competitive, but only competitive, in that it would not get run off the board in a match. It would lose decisively however... I ran a 10 game set vs Cray Blitz about a year ago (right after I first got the quad xeon). I did it as a favor for someone wanting to test a T90 for comparison to something I can't mention. I played the games at a time control of 60 moves in 30 minutes. Cray Blitz won 6 and drew 3. There were only a couple of games that were tactical busts... most were just endgame losses where the Cray searched incredibly deep with its speed advantage... I call that a pretty decisive result. And that same program got stomped by the predecessor of Deep Blue. So no, I wouldn't say Crafty would have any real chance today. In another couple of years, perhaps, as hardware keeps improving. But the speed gap is simply too wide at the moment.
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.