Author: Robert Hyatt
Date: 06:03:30 12/23/98
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On December 23, 1998 at 04:20:43, Alois Ganter wrote: >On December 23, 1998 at 03:17:29, Ralph E. Carter wrote: > >>Do you know that engines under Fritz and Junior have their hashtables cleared >>before every move? And that this has a disproportionate effect on those engines >>that intelligently save information between moves, like hiarcs and crafty? >> >>If nobody cares about questions such as these, I am leaving. > >I mailed Chessbase the question last week and they told me to try this >experiment with Crafty as prove that it is decision of the engine alone what to >do with hash tables: Take the second move of a position and let Crafty calculate >some time. Then clip the analysis with search info from the search window to >Notepad. Then go to the first move and let calculate for some time. Then go >again to the second move and let calculate. Then clip analysis and compare with >the first clip. Now the Crafty engine takes 25% less kN to find the same lines. >I tried with the new 16.2 version from Chessbase download and it is right. And >they say 16.2 is much stronger because Bob Hyatt corrected a problem in hash >management. > >The Doctor? engine makes the same effect. > >Alois I don't know where they get their information from. I didn't do *anything* in 16.2 relative to the fritz engine issue. I have no way to fix this problem on my end. When they send me a "new" I reset the game to the beginning. When they send me a stream of moves, I go thru the phases "opening", then "middlegame" and finally "endgame". Whenever the phase[now] is not equal to the phase[previous] I clear the hash tables. Nothing I did nor can do will solve this. They did *not* implement the xboard interface. They hacked up something that works. A game is supposed to be a "continuous" stream of "my move, your move" not a complete reset before each move. I see no way to implement their approach while not affecting play elsewhere. I don't plan on worrying about this. It could be fixed on their end. It should be fixed on their end. Otherwise it won't be fixed and everyone is going to have to live with the mess...
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