Author: Gerd Isenberg
Date: 01:53:44 07/16/04
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<snip> >I think that it is important to test and the problem of some participants is >lack of testing. > >I talked with Gerd(programmer of Icichess) >Gerd is not a strong chess player. > My german DWZ was slighty above 1600. >His program is even slower searcher than movei in nodes per second and >the programmer told me that most of the time is used on the evaluation. > See latest ICGA Journal, "The Tenth Commandment", Review of Dap Hartmann of "Advances in Computer Games 10", Chapter about Lines of Action, YL versus MONA: "If you are slow anyway, take advantage of it" Or for IsiChess, if you do expensive king eval, why not looking for static mates? >I asked him if he checked to test if what he added in the evaluation was >productive and the surprising reply was negative. > I don't do any autoplayer matches between two versions with different eval, because i am not able to play automaticly ;-( During the last two years or so, i added a few more eval terms after i recognized lack of knowledge in some games IsiChess played in tournaments. Of course this helps in exactly this kind of positions. Depending on the generalization and interactions, i don't know exactly whether it improves the overall performance of the program. At least i debug each new eval terms i added ;-) And i check all kinds of symmetry. Gerd >I try to test terms that I add to the evaluation and unfortunately even things >that are cheap to add did not prove themselves to be productive. > >I have a code to evaluate backward pawns or knightoutposts and it is relatively >cheap to add it(no big difference in nodes per seconds) but none of them was >proved to be productive based on my tests games of the program against previous >version so I did not add them. > >I do not know if the reason is bugs in the evaluation or a different reason like >wrong definition of backward pawn or knight outposts(I try to test before >playing games by giving the new version some positions to analyze to see if the >evaluation is changed to the expected side) > >Uri
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