Author: Uri Blass
Date: 00:58:08 12/02/05
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On December 01, 2005 at 22:53:30, William Penn wrote: >I've used Fruit 2.2.1 to do quite a bit of analysis and have noticed something >similar. It may produce different candidate moves depending on conditions of the >analysis. For example if I reset the GUI or my computer, occasionally a >different candidate move may be produced in the second analysis. I have wondered >if it is a bug, but I can't say for sure. > >I compared your two analyses fairly closely and they produce the same candidate >move (1.gxh5) after about 17 ply, or 3 minutes. It seems to me the two analyses >are fairly similar. After 17 ply the second number is diverging (17/51 versus >17/69) which presumably relates to the condition of the memory in your computer >- which involves hash, paging, virtual memory, your hard drive, etc. Because our >computers use virtual memory and paging in a complicated memory swapping system, >it is almost impossible to reproduce conditions exactly. > >So I'm not sure it is a bug. It may just be a highly sensitive engine doing its >normal thing, where a little apparent randomness creeps in. It is not randomness I can reproduce the same analysis if I use the same conditions with fruit. Same conditions mean the same hash(I used 512 mbytes) Same conditions also mean the same empty history or the same game history in case that there is a game. Same conditions also mean that I analyze with fruit with clear hash by starting with a different engine and replacing engines. Uri
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