Author: Tony Werten
Date: 19:45:11 02/06/01
Go up one level in this thread
On February 06, 2001 at 22:09:25, Ricardo Gibert wrote: >On February 06, 2001 at 21:20:32, Robert Hyatt wrote: > >>On February 06, 2001 at 14:04:03, Severi Salminen wrote: >> >>>Hi! >>> >>>What means lazy and plain alpha bounding as used in DarkThought? These names are >>>used in Heinz's book but not described. Thanks for info. >>> >>>Severi >> >> >>This dates back to the late 1970's. The idea is that when you use a PVS-like >>search, and fail high at the root, you do not re-search the move immediately >>but just accept it as best. If a second move fails high, you have to resolve >>one of them to a true score then search the second with a null-window search >>centered on the new best score. >> >>On a single fail high, you don't do the research at all, you just proceed to >>the next iteration. Which is a bit of a problem in that you have no PV to >>help order the next iteration. > >A nice clear explanation for what turns out to be a very interesting idea. I'll >add it to my notes. Thanks! Be carefull. PVS combined with hashtables and nullmove can give you false failhighs. They can destroy your search. Tony
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.