Author: David Eppstein
Date: 09:43:13 07/23/99
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On July 23, 1999 at 09:10:37, Vincent Diepeveen wrote: > I don't doubt that at the icc server using last ply pruning > and not using checks in qsearch work together very well. > > In diep i don't use last ply pruning yet (although i experimented > with it of course a lot) and therefore i can do checks in > qsearch. My concern with not doing checks in the qsearch is that you will misevaluate positions in which something is protected indirectly by tactics rather than directly by another piece. The q search is supposed to resolve the current material balance, so it should look at checks that change the material balance: skewers, forks, and discoveries. I am not expecting qsearch to find mating attacks, that's what the regular search is for and that way lies huge blowups in the qsearch tree size. If you restrict yourself to only checks that affect material, I think the tree size may not blow up so much. And, I think, one can use SEE-like techniques to distinguish those checks from the other ones. But in Crafty's case, it is hard to argue with success...
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