Author: José Carlos
Date: 13:52:49 10/11/01
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On October 11, 2001 at 14:42:49, Matthias Gemuh wrote: > >Hi Experts, > >What is lazy evaluation? Can I use it in AlphaBeta PV Search ? > >Huge Thanx, >Matthias. It may have other meanings, but I implement it as follows: At a certain position in qsearch, you know the material balance (most of us calculate it incremental), but you have no idea about positional score until you call Evaluate(). If material is very low compared to alpha (for example, alpha==0 and material==a_queen_down) then you know the positional score won't rise the evaluation of the position above alpha, so you don't bother calling Evaluate(), just search the captures (this is up to your implementation of qsearch). Also, if material is far above beta, you can fail high on that node, because you know the positional score won't get the eval down enough. Hope this helps, José C.
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