Author: Robert Hyatt
Date: 14:10:25 07/30/03
Go up one level in this thread
On July 30, 2003 at 13:23:13, Randall Shane wrote: >On July 30, 2003 at 13:09:32, Robert Hyatt wrote: > >> >>I don't like the "illegal move" issue. How can you possibly store an illegal >>move in the hash table? >> >>You have a good move to store if you back up a score that is > alpha, which >>might mean you are backing up a PV, or a fail-high. You don't have a good >>move if you are backing up alpha, because _every_ move failed low and there is >>no way to know which is best... >> >>But storing an illegal move is something that should not happen. If you back >>up alpha, set the hash move to zero. > >Hash collisions, maybe? Should hardly _ever_ happen with a 64 bit hash signature.
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