Author: Andreas Herrmann
Date: 10:14:56 08/14/01
Go up one level in this thread
On August 14, 2001 at 10:29:32, Robert Hyatt wrote: >On August 14, 2001 at 10:21:34, Andreas Herrmann wrote: > >>On August 13, 2001 at 22:54:34, Robert Hyatt wrote: >> >>>On August 13, 2001 at 22:20:18, Artem Pyatakov wrote: >>> >>>>Well, After tweaking my time control and some of my history settings, it seems >>>>like I have pondering under control and it DOES help my engine go about one ply >>>>deeper when it guesses the right move - thanks to people who responded to my >>>>last post about pondering. >>>> >>>>I was wondering about a scenario, however, and about how people handled it in >>>>their engine (just for fun, I will lay this out like a traditional math/physics >>>>problem): >>>> >>>>Initial conditions: >>>>Let's say the normal search produced a PV of length=1, because the very first >>>>move produced a hit in the hash (transposition table). >>>> >>>>Problem: >>>>Right now in my engine, I do not ponder in these cases, because I have no idea >>>>what opponent move to ponder about (it's not in the PV). >>>> >>> >>> >>> >>>I try two things: >>> >>>(1) probe the hash table. If you get a hit, and it has a suggested best >>>move, ponder that. It isn't always good, but it is better than nothing. >>> >>>(2) flip sides, do a short search, and use the move that returns as the >>>move to ponder. Crafty calls this a "puzzling search" and you will see >>>the message "puzzling for a move to ponder" on rare occasions. >>> >> >>Hi Robert, >> >>how deep is Crafty searching in this short search. Depends this on the level? >>I had the same idea with a search to ply 4, but not implemented yet. >> >>Andreas >> > >I believe I use 10% of the "normal" target search time. IE for a 3 minute >(180 second) search, I "puzzle" for 18 seconds to get a move. If you go >too shallow you will get a bogus move to ponder on. If you go too deep, it >costs too much (in time) to get the ponder move. 10% seems to work pretty well >for me... thats of course better than a search to a fixed depth. Andreas
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.