Author: Omid David Tabibi
Date: 14:01:11 11/21/02
Go up one level in this thread
On November 21, 2002 at 16:55:04, Tony Werten wrote: >On November 21, 2002 at 16:19:17, Omid David Tabibi wrote: > >>On November 21, 2002 at 16:05:45, Tony Werten wrote: >> >>>On November 21, 2002 at 13:52:33, Omid David Tabibi wrote: >>> >>>>On November 21, 2002 at 13:05:28, Uri Blass wrote: >>>> >>>>>On November 21, 2002 at 09:16:09, Omid David Tabibi wrote: >>>>> >>>>>>On November 21, 2002 at 08:34:36, Uri Blass wrote: >>>>>> >>>>>>>1)I do not find in the pseudo code in figure 3 undo null move. >>>>>>> >>>>>>>I assume that it should be before if value>=beta and after value=-search(...) >>>>>>>Am I right? >>>>>>> >>>>>> >>>>>>That is why it is called *pseudo*-code :-) >>>>>>You have to fill in the obvious parts by yourself... >>>>>> >>>>>> >>>>>>>2)What is the value of the research for tactical strength? >>>>>>>Should it help significantly relative to searching to reduced depth when >>>>>>>value>=beta without research (even when we get value that is less than beta). >>>>>>> >>>>>> >>>>>>I didn't understand the question. Dp you mean doing a shallow search even when >>>>>>we don't have a fail-high report?! >>>>> >>>>>I meant to ask what is the tactical value of the research(You suggested people >>>>>to start with doing it without the research first and only after it works to do >>>>>it with the research) >>>>> >>>> >>>>The re-search is needed only in zugzwang positions. Such zugzwang positions >>>>occur very rarely in midgames; so you can forgo the zugzwang detection re-search >>>>and still benefit all the improved tactical performance. >>> >>>I was quite surprised to see them from the starting position at a rate of 5 per >>>second. Not impressive, XiniX searches 400 Kn/s there, but still surprising. >>> >> >>The rate of what, was 5 per second? > >"Zugzwang positions" or rather, positions where nullmove would have given a >cutoff but that after reducing depth and searching gave a score < beta. > You mean you got an average of 5 zugzwang indications per second in middle game?!!! Then your program has instabilities which cause a huge number of needless re-searches due to false zugzwang alarm. Turn off your zugzwang detection at once! >Tony > >> >> >>>Tony >>> >>>> >>>> >>>>>Uri
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