Author: Uri Blass
Date: 10:09:45 10/10/02
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On October 10, 2002 at 12:01:43, Sune Fischer wrote: >On October 10, 2002 at 09:09:21, Uri Blass wrote: > >>On October 10, 2002 at 06:51:47, Alessandro Damiani wrote: >> >>>On October 10, 2002 at 02:01:51, Uri Blass wrote: >>> >>>>On October 09, 2002 at 23:06:48, Robert Hyatt wrote: >>>> >>>>> >>>>> >>>>>I had to stop the experiment sooner than I wanted, but I did find some >>>>>interesting things out. >>>>> >>>>>1. at _very_ fast time controls (40 moves in 1 minute) null-move completely >>>>>destroys non-null-move >>>>>by a ridiculous margin. (this ended something like 60 wins, 5 losses, 8 draws) >>>>> >>>>>2. At longer time controls (40 moves in 10 minutes) non-null-move catches up >>>>>somewhat. It still loses >>>>>far more than it wins, but not _nearly_ so bad as test 1. (this was closer, but >>>>>with fewer games played) >>>> >>>>It seems based on your data that null move is more important for blitz and not >>>>for long time control. >>>> >>>>Interesting to know also the difference in plies >>>> >>>>If I compare depth after 3 minutes of search then I see for deep Fritz 3-5 plies >>>>difference at 3 minutes per move between selectivity 0 and the default value 2. >>>> >>> >>>By using a program with unknown source code you cannot be sure that >>>selectivity=2 is only related to null-move. >>> >>>Alessandro >> >>Ok >>I tested movei(R=3) against Movei(R=0) in the same positions and I get after 10 >>minutes of search in every position depthes 12,15 with null move against depthes >>10,11 without null move. >> >>Difference of 2-4 plies that may be even bigger if I use null move in a more >>efficient way. >> > >Depth doesn't mean a thing when you prune, try R=4 or R=5, you will reach even >larger depth, and maybe also solve the testsets faster, but don't forget to see >if it _playes_ better! ;) > >-S. I still did not try R=4 but it seems that R=3 is better than R=2 based on my experience mainly at long time control. Uri
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