Author: Uri Blass
Date: 09:53:12 10/01/04
Go up one level in this thread
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
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