Author: Scott Gasch
Date: 13:13:41 06/01/01
Hi all, I have some questions about recapture extensions. First of all, what is the point? I assume to extend in a position where a recapture move is the only reasonable move so as to see further beyond the forced exchange. Somewhat like singular extensions or one legal reply extensions, I think a properly done recapture extension should not be too expensive. I'd also expect that a well done recapture extension would improve the tactical strength of the engine. Well, I've been trying to get a good recapture extension working on my engine for a while now. I've tried a bunch of different recapture definitions / conditions. Most recently I did: 1. last move was a capture and this move captures the last moved piece 2. this is the first capture considered (weighed by SEE) 3. do not allow two recaptures in a row 4. this move restores the material balance to what it was at the root. ...in which case I extended 1/2 ply. Since I am expecting better tactical ability with the recapture turned on, I test it with the ECM suite. Every time I try, my results are worse with the recapture turned on than with no recapture. I know that a bunch of other engines are doing recapture... so there must be a good idea there somewhere. Can anyone address these questions or propose a solid recapture condition? Thanks, Scott
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