Author: Uri Blass
Date: 06:28:03 08/21/02
Go up one level in this thread
On August 21, 2002 at 09:00:19, Terry McCracken wrote: >On August 21, 2002 at 08:22:06, Vincent Diepeveen wrote: > >>On August 21, 2002 at 08:13:47, emerson tan wrote: >> >>>wHATA IS DEEP BLUES AVERAGE PLY LEVEL ON TOURNAMENT TIME CONTROL, I UNDERSTAND >>>THAT IT CALCULATES 200 MILLION POSITIONS PER SECOND BUT NEVER HEARD OF ITS >>>AVERAGE PLY. THANKS >> >>they estimate it at 126 million nodes a seconda gainst deep blue. >> >>It had a nominal search depth (depth limit) of 12 ply. With a lot of >>tactical extensions a lot of lines were searched at 17 ply though. >> >>that's however true for all chess programs. I averaged in DIEP way >>deeper. It depends basically whether you count hashtable cutoffs with >>the depth or not. I tend to not count them. In hardware there was not >>a hashtable. >> >>Average search depth says nothing. The nominal search depth is more important. >>This was 12 ply. So the weakest link were lines of 12 ply simply. >> >>Best regards, >>Vincent > > >Deep Blue II did searches with extensions of 17 ply + at 3 min. per move and >wasn't uncommon to actually hit 22 plys. > >Dr. Robert Hyatt watched this with his own eyes, so I'm sure he'll have >something relevant to say on this matter. Nobody watched the tree of deep blue. I remember from previous post that people in the deep blue team said that the brute force depth was only 12 plies. The output of deeper blue also does not say 17 plies. There are people who claim that 12(6) means 18 plies brute force but the deep blue team never claimed it. I do not know what it means. It may mean 12 plies brute force with some selective search of the next 6 plies(of course there were extensions but the number 12 6 are not about extensions because it is clear that the longest lines that they searched were clearly more than 18 plies). Uri
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