Author: Uri Blass
Date: 22:29:08 10/01/04
Go up one level in this thread
On October 01, 2004 at 22:55:50, Stuart Cracraft wrote: >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 I may be commercial in the future if movei becomes strong enough. My problem is not lack of ideas but lack of experience in programming and lack of energy to work much on writing a chess program so I do other things instead of it like playing chess or participating in discussions. Uri
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