Author: Tord Romstad
Date: 09:11:30 01/19/04
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On January 19, 2004 at 11:43:21, Sune Fischer wrote: >A while back I ran lots of test positions and compared the PVs between the two >methods. >What I generally saw was that they were identical, only the hash extracted PV >usually were a few moves longer. I extract all my PVs from the hash table. I am not sure I agree with your observation that the hash extracted PVs are usually longer, but I agree that they are *sometimes* longer. Today Leo helped me discover an obscure bug related to this. The maximum search depth in Gothmog is 60 plies, and my PV[] array has 60 entries. The fact that extracting the PV from the hash table could cause a PV of length greater than 60 plies had never passed my mind until Leo sent me a debug file from a game where Gothmog crashed directly after printing out a 61-move PV. :-) Tord
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