Author: Dann Corbit
Date: 11:18:08 01/13/05
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On January 13, 2005 at 10:20:58, Dieter Buerssner wrote: >On January 12, 2005 at 13:52:16, Dann Corbit wrote: > >>I think it wise to test at least the pv also, when the pv has 5 men or less in >>it. Even if it is 100 plies long, that is only 100 probes and completely >>insignificant for time. > >What would you do with the info? Say search/eval shows score +3.2; the PV goes >to TB and says draw? I don't see anything one could do here - it is too late. The information will still be valuable for knowing if you should accept a draw or should deepen your search with a fail low, I think. >It >is also likely, that if you remembered that position that gave you the 3.2 >score, and you hardcoded it for a 0.0 score, you'd get some slightly different >PV, again with a 3.x score. Perhaps again leading to a TB draw, perhaps to a >win. You'd only know it, if you'd probed during search. You may use the TB score to indicate that you need to probe (at least) all the alternative root or attractive root + 1 moves with (TBCOUNT) pieces or less on the board. Or it may be an indication that your search needs to extend. >BTW, It is only one probe, because only the first time your reach a TB-position >in the PV is interesting. You may be missing many tablebase files and all the probes may fail except the last one. >Regards, >Dieter
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