Author: Will Singleton
Date: 08:48:33 12/14/98
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On December 14, 1998 at 05:34:41, Andrew Williams wrote: >Hello all, > >I'm trying to work out how to implement capture/recapture extensions in >my program. I have had a look at crafty and gnuchess and I've tried >several approaches, viz: > >1 Extend when a capture followed by recapture restores the material > balance we had at the root. > >2 Extend when the capture/recapture restores the material balance from > before the sequence. > >3 Extend when the capture and recapture are on the same square (and same > material value). > >In all these cases, I seem to get a much larger tree and often lose a ply >of search because of this. So, three questions: > >(a) Am I on the right lines with 1, 2 and 3 above? >(b) Is it normal to lose depth when doing this? >(c) Generally speaking, it better to complete d7 with this extension than > d8 without it? > >I realize that these questions probably aren't yes/no style questions, so >thanks to anyone who takes the trouble to reply. > >Regards > >Andrew Williams >(Author of PostModernist on ICC) Hi Andrew, I current use (1), and generate a few extra nodes, but not an extra ply's worth. I find I get better ordering with the capture extension in. I'll have to take a look at the code, but I think I have some restriction on recaptures that limits the tree growth. But generally speaking, the recapture extension is almost universally used, and has been shown effective in several studies. Will
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