Author: Günther Simon
Date: 04:49:35 11/24/05
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On November 24, 2005 at 05:17:24, chandler yergin wrote: > Hash is automatically set by the Processor speed.. what is optimum and Max for >the system being used. Right click on the Engine in the analysis window. >The Menu tells you what that is. If you try to exceed that you get a Warning >that it will slow down performance. >In Blitz you want speed. Min Hash! 1 Mg is fine. >As was noted by another Poster.. simply Set Max Hash and read the kn/S >Reset to 1 Mg Hash and check Kn/S No comparison! >Long games you need large Hash. Hash tables Another Chessbase manual mantra in contradiction to your obviously old CB mantra:(from F8) (The truth of course is even more complicated and beyond CB manuals) -------------------------------------------------------------------------------- Hash tables are memory areas in which the program can store positions and evaluations while it is calculating the moves of a game. If the program encounters the same position again, it can simply take the evaluation from the hash tables, rather than analysing the position all over again. (of course not clearing hash to save the already calculated infos, like told above! G.S.) Hash tables increase the playing strength of the program considerably. This is especially true of tactically strong engines like Fritz, Junior or Nimzo. Some run at well over 500,000 positions per second, and will fill the hash tables very quickly. After that, the search slows down. This is not the case in a slower, positionally oriented program, which processes less positions per second, and takes much longer to fill the hash tables. For slower time controls and deep analysis the engines need large hash tables. Tournament games with an average of three minutes (180 seconds) per move would ideally require over 256 MB for the hash tables. On blitz levels four to 64 MB is enough. (for machines in 2002/3! G.S.) Some engines work best with hash tables sizes that are powers of two. This means that 64 MB of hash tables is much more valuable than 63 MB. Hash table sizes are set in the "Load engine" menu. (for machines in 2002/3! G.S.) -------------------------------------------------------------------------------- Nothing of 1Mb hash for Blitz, nothing of clearing hash between moves, even Chessbase sometimes updates their manuals ;) And for an extro info for you even this hash sizes are now outdated as processors again gained speed in the last years, which means _more_ hash today again... Guenther
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