Author: Uri Blass
Date: 00:32:00 10/18/02
Go up one level in this thread
On October 17, 2002 at 23:48:27, Robert Hyatt wrote: >On October 17, 2002 at 19:57:41, Uri Blass wrote: > >>On October 17, 2002 at 18:12:02, Robert Hyatt wrote: >> >>>On October 17, 2002 at 16:34:08, Murray wrote: >>> >>>>On October 17, 2002 at 10:07:41, ujecrh wrote: >>>> >>>>>(snip) >>>>>We can track opponent's thinking time and, without trying to match it, add some >>>>>time or search extensions when an unusual delay has occured. >>>>> >>>> >>>>But humans also ponder when the computer is thinking. It could be argued that if >>>>the human is having to spend a long time thinking in a difficult position, the >>>>computer should play just as quickly or quicker than normal, to reduce the >>>>human's chance of seeing through the complications. >>>> >>>>Murray Cash >>> >>> >>>If the computer had any _idea_ about what makes up a complex/hard-to-analyze >>>position, >>>this would be a good plan. But it doesn't have a clue about whether the >>>opponent has an >>>easy or difficult position to play, and trying to play games with time usage >>>will more often >>>than not blow up in your face.... >> >>The computer may ponder about all the possible moves but use different time for >>different moves(I remember that I read that this idea is used by aristarch). >> >>If based on the scores it can see that there is a forced move it can give it >>almost all of the time but if it see 5 moves with almost the same score it can >>continue to analyze them and use almost 1/5 of the time for everyone of them. > >This idea is simply no good. I have explained why a dozen times or two, over >the past 10 years... It doesn't work now. It didn't work 20 years ago. It >won't >work 20 years from now either. > >The _best_ way to ponder is to pick the best move and go with it, unless the >program >is so bad it can't predict right even 50% of the time, which is very low... I think that the best way to ponder is not so simple I do not try today to use it and movei ponder only on the expected move or wait in case that it finished to ponder. It is certainly better than using the same time for all moves but if you ponder more time on the better moves than I believe that pondering on all the moves may be better. You should start by pondering most of the time on the expected move but if you fail high on the search after the expected move or if the difference in evaluation relative to other moves is small then you can increase the time for the other moves. Small difference means less than 0.1 pawn and if the difference in evaluation is 0.3 pawns you still may use 70-80% of your time for the expected move and if the difference is more than 1 pawn you may use even more than 90% of your time for the expected move. Uri
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