Author: Stuart Cracraft
Date: 19:55:50 10/01/04
Go up one level in this thread
On October 01, 2004 at 12:53:12, Uri Blass wrote: >On October 01, 2004 at 12:20:18, Stuart Cracraft wrote: > >>On October 01, 2004 at 08:58:58, Uri Blass wrote: >> >>>On October 01, 2004 at 08:00:27, Ross Boyd wrote: >>> >>>>On October 01, 2004 at 06:46:00, Uri Blass wrote: >>>> >>>>>On October 01, 2004 at 04:23:24, Ross Boyd wrote: >>>>> >>>>>>On October 01, 2004 at 02:27:59, Uri Blass wrote: >>>>>> >>>>>>>On September 30, 2004 at 19:40:30, Ross Boyd wrote: >>>>>>> >>>>>>><snipped> >>>>>>>>BTW, I'd suggest toning down your recapture extensions somewhat. I don't allow >>>>>>>>recap extensions unless they occur in the last 3 ply of the main search. The >>>>>>>>point is there is no point in extending recaps at shallow depths because the >>>>>>>>tree simply explodes. You may have been using over-aggressive recap extensions >>>>>>>>to 'compensate' for the lack of other key extensions. >>>>>>> >>>>>>>It seems to me that you mean to something else. >>>>>>> >>>>>>>You say that there is no point in extending recaps at shallow depth but based on >>>>>>>your words I understand that you allow recapture extensions only at shallow >>>>>>>depth(only in the last 3 plies of the main search). >>>>>>> >>>>>>>Uri >>>>> >>>>> >>>>>I see no response in your reply. >>>>> >>>>>I will explain again the problem. >>>>>Here is again your sentence >>>>>"I don't allow >>>>>recap extensions unless they occur in the last 3 ply of the main search." >>>>> >>>>>unless is if not >>>>> >>>>>You do not allow recapture extensions if they do not occur in the last 3 plies. >>>>>In other words you allow recapture extensions only in the last 3 plies and the >>>>>last 3 plies are shallow depth depth<=3 based on my understanding. >>>>> >>>>>Uri >>>> >>>>Hi Uri, >>>> >>>>This is strange. I mistakenly hit enter before replying, hence the blank reply. >>>>And then I replied again but somehow the reply is not displayed. >>>> >>>>Anyway, you are right, I meant to say that extending recaps is useful only near >>>>the tips ie. last 3 ply. Close to the root recapture extensions expand the tree >>>>for no good reason. That's all I was trying to say. >>>> >>>>You have a sharp eye for detail. :-) >>>> >>>>Best wishes, >>>> >>>>Ross >>> >>>I do not agree about it and there is a good reason to extend recaptures near the >>>root when you often search logical lines and not near the leaves when you more >>>often have illogical lines so there is a good logical reason to ti extend >>>recaptures near the root. >>> >>>recaptures also simplify the position so you may be able to search to depth 9 >>>after recapture faster than many searchs that you do to depth 8 after quiet >>>moves when you will not be able to search to depth 2 after recapture faster than >>>searching to depth 1 after quiet moves. >>> >>>Uri >> >>Then Uri do you suggest to recapture only if depth > N and not search >>recapture if depth <= N or won't you go that far? >> >>What does movei do and why do you call it movei? A Move Instruction? >> >>Stuart > >I call it movei because I worked a lot on the move generation. >I do something about it but I am not sure that it plays better with it(I think >that last time that I tested changes in it was more than a year ago and only in >test suites). > >I will not give the details here but only say that I do not extend every >recapture and how much to extend is dependent not only on the remaining depth >but also on other factors. > > >Uri If you are not commercial, what is the benefit of not divulging? Stuart
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