Author: Robert Hyatt
Date: 21:48:14 10/07/99
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On October 07, 1999 at 23:43:19, Bruce Moreland wrote: >On October 07, 1999 at 21:21:39, Robert Hyatt wrote: > >>On October 07, 1999 at 20:45:08, James Robertson wrote: >> >>>My search currently decides a position is drawn if it has repeated twice. I >>>think this is causing my search to sometimes stuff 2nd rep draw values into the >>>hash table that can be retrieved for positions with different history's. Is this >>>a problem? What do other people do? Could I just not store any draw values in >>>the hash table? Should I go to draw by 3rd rep? >>> >>>Thanks, >>>James >> >> >>Dave Slate used to advocate not storing draws in hash table. Ken Thompson >>and I both did (and I still do). Either way has its drawbacks... > >This may cure some symptoms but it does not solve the problem. > >bruce I think you misunderstood my statement. Slate said "don't store draws". Ken and I stored draws anyway. All the problems are unsolvable, unless the hash table includes pathway information (which I have done in the past to test, since you can easily hash moves into the signature). But doing the path stuff kills the number of transpositions. When machines are fast enough, we can dump hashing totally except for move ordering, and get a big debugging headache excised. :)
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