Author: Severi Salminen
Date: 07:55:21 01/26/01
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>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.
Have you tried limited razoring as described by Ernst Heinz? So, if we are at
D=3 (distance to horizon) and material_balance+RAZOR_MARGIN<=alpha decrease
depth to 2:
if((material()+MARGIN)<=alpha)
depth=2;
Heinz suggests values of Queen - Queen+1 to be used as MARGIN.
Severi
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