Author: Robert Hyatt
Date: 19:14:28 08/29/01
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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. 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. you over-rate the 2 plies that null-move gains. It doesn't come "free". Just look at all the positions posted where null-movers can't solve them, _ever_. DT didn't have that problem. > >Alberto
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