Author: Tony Werten
Date: 11:43:32 03/29/01
Go up one level in this thread
On March 29, 2001 at 14:24:14, Robert Hyatt wrote: >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. >> >>Tony > > >Don't forget the _obvious_ limits: > >1. only probe after a capture that takes you to 5 or fewer pieces on the >board. > >2. never probe in other circumstances. IE if you _already_ have 5 pieces >on the board, there is no sense in probing, because the capture that dropped >you to 5 pieces would have been a probe hit and you would not still be >searching. Since you didn't have the right tablebase _then_ you are not going >to have it _now_. Didn't think about the second one because until now I've always had all the tables. Might be a good idea to put it in though. Tony
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