Author: Uri Blass
Date: 20:08:30 08/29/01
Go up one level in this thread
On August 29, 2001 at 22:14:28, Robert Hyatt wrote: >On August 29, 2001 at 17:55:40, Alberto Rezza wrote: > >>On August 29, 2001 at 10:41:45, Robert Hyatt wrote: >> >>>So the 1992 (roughly) version of the program, made using 3 micron ASICS, >>>was at _least_ as strong as either deep fritz or deep junior on today's >>>hardware. I will be conservative and say they are "equal". >> >>Of all the things that have been said in this thread, I find THIS the hardest to >>believe. 1M n/s is not that much. And that was without null move, right? >>How much shallower was their search? 5 plies less than DF/DJ, perhaps? >> > >I don't know. I saw DT search 10-11 plies deep. I do about 2 plies deeper >than that with null-move R=2. I am not sure how deep Fritz searches, but >unless it uses some additional pruning, I would expect 12-13 just like me >at 1M nodes per second. From my experience Deep Fritz can usually search deeper than 12-13 plies and depth 15 is more realistic for tournament time control. > >Remember that a null-move search goes deeper, but experiences failures that >"hide" things when you drop 2 plies here and there. It is not free. > > > > >>And the eval was probably nothing special either - this is DT 1, not DB 2. >> >>I'd say it would have been very lucky to score 15% against DF or DJ... > > >I disagree. I played some games with Cray Blitz vs Crafty. CB was >consistently searching 1-2 plies less deeply (it had hardware about 7x faster >than Crafty in terms of NPS). Yet it won the 10 game match convincingly. I believe that the main problem is that the time control was too fast. I also believe that the evaluation of Crafty is better than Cray blitz because tuning the evaluation to the right parameters is more important than the knowledge that the Cray has and Crafty has not. Uri
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