Author: Robert Hyatt
Date: 11:35:50 07/25/00
Go up one level in this thread
On July 25, 2000 at 00:07:33, Christophe Theron wrote: > >So now let's see what happened. On his hardware, Tiger was computing only 25,000 >positions per second. At 15mn/game time control, that means it was computing >375,000 positions per search in average. > >Isn't Deep Blue supposed to compute way faster? I don't remember the numbers. >Was it 1M nodes per second per chip, or 2M nodes per second? According to Hsu, some of the chess processors run at 2M nodes per second, others run at 2.4M nodes per second. The Web-based DB Jr system used one chip, according to hsu, but with various parts disabled. IE it was stateless, so no repetition detection was possible. Some of the eval was turned off so that downloading time was reduced to keep in line with the 1 second total time (including download). Etc... I posted a one paragraph description sent to me directly by Hsu, which gave the important details, plus the estimate that he thought it was maybe a 2200 player (if that). > >If it's only 1M nodes per second and it could only use 3/4 of a second for its >search (the rest being taken by "downloading stuffs into the chip" as Bob said), >then it's still 750,000 positions per search, twice the number of positions that >Tiger could compute during its search on P150. > > >So my conclusion is that I have seen nothing special in this match. I have seen >2 chess programs fighting, the one computing more nodes taking the advantage, >but certainly not crushing its opponent as some people would like us to believe. > >The funny thing is that before playing the match I thought I would be crushed. >You see, I have been the victim of the propaganda myself... > > >Now if you ask me about the chances of Chess Tiger against Deeper Blue and its >200 processors at tournament time controls, I simply say that I think that Chess >Tiger has absolutely no chance. > >But against a single chip, I would say that a program like Chess Tiger running >on current top hardware has its chances. Certainly. And actually pretty good chances, since it is possible to come close to the speed of a single chip, leaving them the only advantage left which is buried in their evaluation... Beating a single chip would not be easy, but certainly doable. Unless your program is very naive about king safety, as that is where Hsu said the first 10-game 10-0 result match was decided... The micros let it attack, and it was only too happy to do so... > >Remember that in similar circumstances (fast games played in the same hall) >Rebel won against Deep Blue Junior by 3-0. > >And you know what? Given that Deep Blue does no forward pruning, this is NO >SURPRISE. > > > > Christophe Maybe or maybe not. I still don't think they forward prune. But at the depths they reach, maybe it isn't necessary.
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