Author: Dieter Buerssner
Date: 09:50:26 01/23/01
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On January 23, 2001 at 11:11:56, Brian Richardson wrote: >This [not having a full set of EGTBs]has turned out to be a fairly significant > problem for Tinker on ICC. I >don't have room currently for all of the 5 piece files, but do have most of the >pawn combinations. And then the problem can be, that the program refuses to promote. I have tried the following. Probe the root position of the search. If this is a TB mate, do all legal moves, and look if probing them is successful. If not all moves yield in a TB hit (because a promotion table is missing), never probe TBs of this many pieces in the search. So if the root position is KRPKR and the P can promote and KQRKR is missing, I will only probe 4-men tables in the search. Some care has to be taken with transposition tables. If EGTB hits are stored in the hash, and the hash is not cleared between moves, I do not allow to return the EGTB scores from the hash with 5 pieces in the above scenario. BTW. I think 4+1 TBs are not of much help. Regards, Dieter
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