Author: Gian-Carlo Pascutto
Date: 02:31:40 08/22/02
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On August 21, 2002 at 22:35:53, Robert Hyatt wrote: >On August 21, 2002 at 14:51:17, Gian-Carlo Pascutto wrote: > >>On August 21, 2002 at 14:44:37, Robert Hyatt wrote: >> >>>>Please look at page 5 very carefully 12.2 ply it says. >>> >>>Yes. And take the logs and add up the _first_ number from each iteration >>>and divide by N. Guess what you get? 12.2... >>> >>>Which was the software part of their search. >> >>They certainly don't say the last. >> >>A bit further, you can see that a nominal depth of 12 compromised 8 ply >>nominal in software. Add 4-5 hardware ply and you get 12-13 ply. >> >>8 ply in software, plus hardware plies. Not 12 ply in software plus >>hardware plies. >> >>The paper is pretty conclusive that they were not searching 18 ply >>nominally, but only 12 ply. They even literally wrote it. >> >>-- >>GCP > > >It doesn't read like what the team said, that is for sure. But there are two >key pieces of data that I _personally_ know to be true: > >(1) deep thought searched 10-11 plies in 1989 at the WCCC in Alberta. It >continued to search that deep thru the 1994 ACM event in Cape May, New Jersey. >I was there. I watched their monitor as we sat around the table watching their >games. So there is absolutely no doubt about that 10-11 ply number as I _know_ >what was happening in those games. > >(2) deep blue was claimed to be 100X faster. That should turn into 4-5 plies >at their EBF as shown in the logs... > >More than that I won't speculate on. But Cray Blitz was searching 9-10 plies >at 400K nodes per second, and I _know_ DT was out-searching us at _least_ a >ply, plus their singular extensions that we were not using in 1989. I think Uri already sufficiently addressed this question above. Loss of efficiency, more extensions, and the bad branching factor all contribute to a minimal gain. -- GCP
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