Author: Dave Gomboc
Date: 14:09:24 03/25/99
Go up one level in this thread
On March 24, 1999 at 22:42:20, Robert Hyatt wrote: >On March 23, 1999 at 12:18:29, Vincent Diepeveen wrote: > >>On March 22, 1999 at 07:57:06, Robert Hyatt wrote: >> >>>On March 21, 1999 at 20:05:08, Charles L. Williams wrote: >>> >>>>Is it advantageous to keep updating the PV after entering the quiescence search, >>>>or should this search be kept very simple? I'm getting ready to add one, >>>>captures only. Thanks in advance. >>>> >>>>Chuck >>> >>> >>>If you don't you won't see the end of the PV when you display it at the root, >>>and this can make testing/debugging difficult, since you won't have any idea >>>what the complete path looks like from the root to the position where you did >>>an Evaluate() and then accepted that score. In fact, your entire PV will have >>>problems if you don't 'latch it' at the precise instant the score is 'ok'. >> >>Sure. an easy solution is there however: if you get your PV from the >>hashtable and if you are using several probes at the hashtable, >>then you can get the PV out of the hashtable and this includes then the >>q-search too. >> >>Quick and easy! >> >>Greetings, >>Vincent > > >It's easy if you can be _sure_ you won't overwrite a PV hash entry. IE how many >times do you get the first result back quickly, then do a bunch of searching on >later moves because they have lots of checks that produce lots of extensions. > >What do you do if the PV gets overwritten before you need it? I tried this a >long time ago. And didn't like the result. We back up the PV so infrequently >I can't really measure the time it takes anyway... it is very minimal... I would appreciate it if someone described a way to ensure that hash positions belonging to the PV do not get overwritten without adversely affecting general performance. As things stand I am tracking the best move at the root separately, because occasionally my root position gets trashed. I am using replacement scheme BIG-1 (q.v. Dennis Breuker's Ph.D. thesis). Dave Gomboc
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