Author: Joachim Rang
Date: 06:12:54 12/19/04
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On December 19, 2004 at 08:46:19, Tansel Turgut wrote: >I noticed that when I am running exactly the same position on 2 different >computers (using the same chess engine), they are giving me different moves as >the best move. (ie: 20 plies, 21plies, 22 plies: the best moves are slightly >different) > >How is this possible? One computer is slightly faster, but the best move >shouldn't change. > >Tansel Turgut all things may happen. ;-) Some more common causes: 1.) Dual- or Multiple-CPU machine. The parallel search is non-deterministic, differences even on the same machine are to be expected. 2.) Different Hashsizes - very often the best move varies with different hashsizes on different iterations. 3.) Hashentrieartefacts if the Hashtables weren't deleted before analyzing the position If you can exclue all these circumstances and can reproduce the difference we might continue speculationg. Then it would be helpful if you could give more specifics. regards Joachim
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