Author: Gian-Carlo Pascutto
Date: 05:41:54 01/25/01
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On January 25, 2001 at 08:20:26, David Rasmussen wrote: >Howdy. > >Inspired by the thread on extensions, I was wondering whether the idea of >negative extensions or reductions could be a good one. > >I mean, maybe many of the "unsound" pruning methods would be sounder if, >instead of just pruning, they just adjusted the resulting depth down. In that >way, a line would still be examined, only later. This is often called razoring. Heinz describes it in his articles together with futility pruning. Robert used it for some time but ditched it awterwards. I still use them, I know Amy uses them also and probably several other programs. -- GCP
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