Author: Komputer Korner
Date: 00:25:39 11/19/98
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On November 17, 1998 at 05:32:17, Harald Faber wrote: >On November 16, 1998 at 11:44:52, Komputer Korner wrote: > >>>Hi Ed, >>>I am not sure to reach you via e-mail so I write it here too: >>> >>>I have seen strange behaviour in Rebel10. I have AMD-K6-200 and Laptop166MMX. In >>>the same position the AMD has a diiferent best move with a different value than >>>the 166MMX AT SAME SEARCH DEPTH. How is this possible, any explainations? >> >>Harald, you should know better. We have had discussions about this phenomenon >>many times. There are a whole host of reasons ranging from hash table anomolies >>to move ordering, all of which are affected by different times used. Determinism >>is an impossiblity in present day chess programs so forget about the idea. >>Komputer Korner > >Hmm. Then s.th. is wrong, either my point of view or the program itself. I >always assumed depth=8 is depth=8, no matter which computer is used. Only slower >computer should need longer to reach that depth but the result should be the >same. I am talking of analysis mode, same explaination? There is no guarantee that the same move will be found. However 2 computers that are roughly the same speed and have the same architecture present a level playing field for 2 programs, but as for duplicating moves exactly, that won't happen all the time. Probably Bob has done some tests on this, but determinism is a dream with chess programs. -- Komputer Korner
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