Author: Tord Romstad
Date: 07:11:00 10/23/03
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On October 22, 2003 at 21:02:04, Zach Wegner wrote: >when hashing, is it really necessary to hash the exact fractional depth, or is >it ok to just hash depth/PLY? I am thinking it is better to do the latter >because it saves space and also if the current depth is (say) 1.3 plies and the >hash table says 1.2, there wont be a cutoff, while the actual depth searched is >the same. or is it necessary because you might extend .7 plies on the next ply, >giving a premature cutoff? As so often, it's a tradeoff. Just storing depth/PLY will definitely cause an increased number of errors and instabilities in the search if you use any fractional extensions or reductions at all. Whether the advantage of saving a few bits in the hash table entries is big enough to compensate for this is probably impossible to say without experimenting. I expect that the results would vary a lot between different programs. Personally I have always stored the exact fractional depth, and I don't think I will every try something else. Tord
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