Author: Will Singleton
Date: 12:02:23 11/20/98
Go up one level in this thread
On November 20, 1998 at 11:03:09, Inmann Werner wrote: >On November 20, 1998 at 09:35:46, Robert Hyatt wrote: > >>On November 20, 1998 at 06:28:01, Inmann Werner wrote: >> >>> >>>Do you really make null moves in the PV. How do you manage, that Null moves do >>>not get into the PV? >>> >>>Werner >> >> >>Because when we do the null-move search, if it fails high we return beta >>which means it *can't* get into the pv (failed high). If it doesn't fail >>high, we ignore it and do a normal search, which means something else will >>get into the pv with the null-move being ignored totally. > >Thanks a lot, Robert and Peter!!!! > >This was one of the most simple and good tips, I got!!! >I now use null move also in the PV, had to change only one variable in my >program and my search tree is reduced by 40%!!!! (tested with 4 positions) >It must be some brain-damage of me, why I did not recognize this of my own. >There you go looking for speed increasments of 2 to 5 percent, and here you get >a lot of this as simple! > >Thanks again > >Werner 40 percent? Seems like a lot. You might want to check your results on the full WAC. I would think you'd solve a lot more with the added depth, and if not, then you've got a problem. I'd be interested in knowing. Will
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