Author: Uri Blass
Date: 16:05:32 10/02/04
Go up one level in this thread
On October 02, 2004 at 10:20:38, Stuart Cracraft wrote: >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. Movei is already a chess program that is near 2400 level so I already wrote a chess program and the problem is that I even did not try to implement many of my ideas. Uri
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