Author: Stuart Cracraft
Date: 07:20:38 10/02/04
Go up one level in this thread
On October 02, 2004 at 01:29:08, Uri Blass wrote: >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 No problem there. We all have lives apart from this stuff. If you don't want to write a chess program, consider working with an experienced programmer to do the heavy programming work as a collaborator.
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