Author: Robert Hyatt
Date: 08:51:13 10/11/02
Go up one level in this thread
On October 11, 2002 at 07:43:40, Uri Blass wrote: >On October 11, 2002 at 07:12:34, Vincent Diepeveen wrote: > >>On October 11, 2002 at 04:08:49, Uri Blass wrote: >> >>Isn't his article clear enough yet? > >Bob Hyatt still claims that it was 12 plies software and 6 plies hardware >so I prefer to hear an answer directly from Hsu. I agree. But _I_ don't claiam _anything_ except that members of the DB team specifically told me that 12(6) means 12 plies in hardware, 6 in software. I even posted the excerpt from the email that specifically said this... That is _all_ I have said about it... > >> >>reporting a 12.2 average search depth fullwidth. >>I guess you never searched with a decent program fullwidth >>with extensions. If you did, you would understand that >>getting 12.2 ply fullwidth with loads of extensions is already nearly >>impossible. Every extended line is searched to the full depth, >>no pruning happens! > >I agree that 12.2 plies with a lot of extensions and no pruning is impossible >for normal programs and also is impossible for deep blue in case that >there were real 6 more plies in the hardware. > >The only case when it may be possible is if the 6 more plies in the hardware are >real selective search and it means more pruning than null move with R=3 and in >this case the 6 plies in the hardware may be eqvivalent to only 2 plies in >software because of big probability to miss things. > >> >>The interesting 2 questions are >> a) did DB use 'no-progress pruning' in SOFTWARE (we know >> already it used it in hardware). > >They explained in the article that they did not want to take risks of missing >something in the first plies so it is clear that they did no pruning in the >first 12 plies. > >If they did some pruning in the software it is clearly after it. > >I do not know what is exactly no progress pruning. >Is there a difference between it and null move pruning? > >Is no progress pruning more aggresive than null move pruning? > >Uri
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