Author: Robert Hyatt
Date: 09:20:00 09/28/02
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On September 28, 2002 at 11:38:19, Sune Fischer wrote: >Carlos Pagador just sent me a game where frenzee made a clear blunder move. > >It wasn't a bug in the search, but in the time management. >What happened was that the pv move failed-low at the root (I think that's what >it's called?), it was a mate in 3 so it had to be avoided. > >The searched continued and the second move searched happened to be a very bad >queen "sacrifice"! > >Unfortunately time was up before it could search the third move, so it played >this losing queen move. > >It could have been worse actually, if it hadn't searched the second move either >it would have gone straight into the mate, not suspecting the move was bad at >all. > >I wonder how many buggy moves are made because of these fail-lows, I never >thought about this at all, but of course the actual move being returned could be >almost random when this happens. I reckon this is common knowledge, I just don't >remember having seen it explained anywhere? It is easy to fix. If you fail low on the _first_ root move, then re-search it right then to get a score. Now you know how bad things are and how much time you are willing to invest in order to find a better move... > >Ok, the fix is obvious, namely to finish the ply if your first move "fails-low", >and somehow ask for a time extension to make it happen. > >-S.
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