Author: Robert Hyatt
Date: 11:24:14 03/29/01
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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_.
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