Author: Sune Fischer
Date: 11:43:06 07/27/04
Go up one level in this thread
On July 27, 2004 at 13:33:40, Robert Hyatt wrote: >On July 27, 2004 at 09:42:46, Sune Fischer wrote: > >>On July 27, 2004 at 09:33:13, Anthony Cozzie wrote: >> >>>On July 27, 2004 at 03:18:50, Sune Fischer wrote: >>> >>>>On July 25, 2004 at 22:01:31, Robert Hyatt wrote: >>>> >>>>>Bad idea. Start the next iteration even if you don't think you will have time >>>>>to finish it. You might fail low. Wouldn't that be nice to know? :) >>>> >>>>This may or may not be a good idea. >>>> >>>>I think if it is a good idea, then you should always try and search the next >>>>iteration for a short time to see if you get a quick fail-low. >>>> >>>>On the other hand, if it is a bad idea it is better to save the time that will >>>>probably be wasted anyway. >>>> >>>>From what I can tell you propose to do a mixture, i.e. to use extra time if the >>>>time manager tells you to? >>>> >>>>I really doubt this is the best way, because it will be extremely random when >>>>you get to begin the next ply. >>>> >>>>-S. >>> >>>It seems you have 3 options here: >>> >>>Optimism: Hope that a move you haven't searched yet will fail high; terminate >>>after searching all moves. >>> >>>Pessimism: Make sure that the move you want to play won't fail low: terminate >>>after searching the first move. >>> >>>Don't Care: Just exit whenever time runs out ;) >> >>I think you have more choices, e.g. search the next ply, when time is about to >>run out, with a null window around the fail-low bound. > >I don't think any of that is reasonable. I have seen searches where the first >move takes 1 second to resolve a true score. I have seen searches where the >first move will talk almost forever to resolve the score. KISS is a good idea >here, IMHO. ...which is why you shouldn't try and resolve the score. :) >> >>Just to assert as quickly as possible that it doesn't fail horribly low. >> >>Little sense in trying to resolve an exact score for the next ply if you only >>15% time left. > > >Often that is more than enough time to resolve the score. I think 15% is rarely enough time. If the whole last ply took 70% and the first move on the last ply took 60%, then you can probably expect to use about twice that, i.e. 120% time, to resolve the score on the first move. That's pretty hopeless unless something dramatic happens. -S.
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