Author: Vincent Diepeveen
Date: 06:24:57 03/30/01
Go up one level in this thread
On March 29, 2001 at 14:10:06, Tony Werten wrote: >On March 29, 2001 at 09:14:06, Robert Hyatt wrote: > >>On March 29, 2001 at 04:37:19, Tony Werten wrote: >> >>>Hi all, >>> >>>until what depth do various programs probe the tablebases ? >>> >>>cheers, >>> >>>Tony >> >> >>With Crafty, if I am doing a 14 ply search, I probe until depth > 14. Since >>in 40/2hr games I typically search to depth 13/14 in the middlegame, that is a >>good limit. If I do an iteration to 19 plies, then I probe to 19 plies. > >That's what I'm doing actually. I tried probing in qsearch (only first couple of >ply) but in testpositions my harddisk would go nuts. OTOH in testpositions you >don't have previous positions that would already have excluded certain >searchpaths. > >In matches it works (probing first plies in qsearch) until the opponent does a >couple of unexpected moves. > >Same seems to happen when probing everywhere in full search ( including >extensions ) > >In the dutch championships I got my egtb code working the second weekend and I >turned it on including unlimited probing in qsearch. After 12 moves or so, I got >out of book and spend 8 min on the search. I got 2 egtb hits while in the >rootposition there were 30 pieces on the board ( I had recapture extensions). >Then I got the idea that it might not be usefull to probe that much. Yes you mentionned that earlier, i was actually pretty amazed that you do so many weird capturing lines at small depths (12 ply or so?). Anyway be happy, my draughtsprogram probes right from openings position and it does that with quite a number out of hundreds of thousands of nodes a second. No easy way to cutoff there as you can't use anything that looks like nullmove in draughts as doing nothing is usually the best possible plan... >Tony
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