Author: martin fierz
Date: 03:35:57 09/25/04
well, as promised here are questions 4-7 of a zillion. perhaps i should also add that the train ride from zurich to brissago takes about 3 hours and that i have a centrino laptop, so i need some input :-) nullmove questions! 1) do you save "don't nullmove" in your hashtable? if yes, how much does it help you? isn't this a tinytiny improvement, since if you do nullmove, and it fails, you have to research a much larger tree? you would be saving "don't nullmove" if your nullmove fails, right? 2) related: do you save matethreat in your hashtable? is this not another tinytiny improvement? 3) some people advocate not to nullmove if the side to move has few (mostly 0, perhaps also 1?) pieces. i realize that zugzwang is a problem for nullmove, but is it a real problem as far as games go? isn't it possible that in pawn endgames doing a nullmove would lead to a few embarassing losses, but help overall? 4) i never thought much about verified 0-move pruning. but a post i read last week made me think: i always thought i could do the following: if(pieces > 0) if nullmove-fails-high return value; if(pieces == 0) // do a verification search if nullmove-fails-high verify result with a normal search with reduced depth. if verification-search-fails-high return value; now there was this post saying that this won't work because you have to disable the nullmove in your entire verification search. i don't understand why that would be? can somebody explain? cheers martin
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.