Author: Scott Gasch
Date: 15:26:40 07/25/02
Hi, I recently reworked my hash tables to be more efficient and found, to my surprise, that my engine could not longer solve FINE70. Well I hunted this down and found that it was not a hash bug but rather a problem with an addition I made a while ago: a nullmove verification search. The idea (which may be a bad one, it seems) is to _always_ nullmove (even in late endgames) but before accepting a FH after null search, do a reduced depth search to verify the FH result. It seems like this works very well in some positions (and has the side effect of allowing you to do a zugzwang extensions when the nullmove search FH and the verification search does not). But it royally screws up the FINE70 position. My question for other programmers around is: is there anyone else playing with this null verification search and how are your results / impressions? Scott
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