Author: Uri Blass
Date: 08:48:02 07/23/02
Go up one level in this thread
On July 23, 2002 at 11:36:36, Robert Hyatt wrote: >On July 23, 2002 at 10:40:00, Uri Blass wrote: > >>On July 23, 2002 at 10:06:18, Robert Hyatt wrote: >> >>>On July 23, 2002 at 04:18:46, Bo Persson wrote: >>> >>>>On July 23, 2002 at 00:32:44, K. Burcham wrote: >>>> >>>>> >>>>> >>>>>Some say that Deep Blue could analyze 200,000kns in some positions. >>>>> >>>> >>>>This is more the *average* speed of the system. I have seen figures of up to 1 >>>>billion nodes per second, in favourable (for speed) positions. >>> >>> >>>I have a paper written by Hsu and Campbell that says their peak speed during >>>the 1997 match was 360M for a single move. Of course, the machine was capable >>>of bursts to 1 billion nodes per second, which I am sure it hit at times >>>since that only required that all 480 chess procesors be busy at the same >>>instant. >>> >>> >>> >>>> >>>>This doesn't say, of course, what the search speed would have been in your test >>>>position. Could have been 150M nodes/s, could have been 950M nodes/s... >>>> >>>> >>>>The comparison of speed is also somewhat flawed by the fact that Deep Blue was >>>>explicitly designed to be fast (as in nodes per second), which most of the other >>>>programs are not. >>> >>> >>> >>>I don't agree with that. DB was a two-fold design: (1) fast, due to special- >>>purpose hardware (2) good, due to adding whatever they though necessary into >>>the hardware. >>> >>>Software programs don't have the option (2) available to them, so to keep >>>option (1) viable, they compromise. DB didn't have to. >> >>In order to have good evaluation function you need to know what is good. >>Programmers today know better than what they knew in 1997. >> >>Uri > > >No we don't. Chess has been chess for 100 years. 20 years ago we knew what >we "needed". No we did not. Prorammers know better today because they have more experience in chess programming relative to the experience that they had some years ago. Finding the right evaluation and deciding what to evaluate is the problem. The evaluation of the top programs of today is better relative to the evaluation of some years ago. Uri And we knew what we could "afford". Today, what we "need" has >not changed one iota, but what we can afford has changed drastically. DB just >got to this point way before we got there...
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