Author: Andreas Herrmann
Date: 07:21:34 08/14/01
Go up one level in this thread
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 > > > >>Possible Solutions: >>1) I am guessing that it is often possible to discover the "next" move in the PV >>by simply looking at the transposition table once again and seeing if we can >>extend the PV further >> >>2) May be I should try to ponder about a different move??? I just don't like the >>idea of my engine wasting time... >> >>3) Any other ideas about how this problem can be addressed? I know this is >>probably not a very important thing, but I was just curious about a possible >>solution. >> >>Thank you. >> >>Artem
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