Author: Artem Pyatakov
Date: 23:37:55 08/19/01
I have a (somewhat) strange question about null move and WAC.001. Here is what happens when I run my program: Depth=4 (Correct PV here) +MATE2 Depth=5 Fail Low !!! (Aspiration window +MATE2-50 +MATE2+50) Depth=5 +MATE2 I investigated and discovered why this strange fail low happens: it happens because when I start search search on depth 5, I search the move in the PV from depth 4 (the correct mating move) first. After making the move, I do a null move search (R=2) - and this is where it returns beta. So, I have two questions: 1) Is this behavior inherent to null-move or is there a way around it? 2) How would I avoid this kind of fail-low behavior? (Perhaps, I should write different code for null move when a search returns -MATE/+MATE?) Thank you Artem
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