Author: Uri Blass
Date: 12:14:18 06/16/02
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On June 16, 2002 at 14:12:15, Stan Arts wrote: >Hello, > >I´m working on my chessprogram, it´s very new and I have just gotten a >simple method of alpha-beta working in my program. Other than that it is >still a simple fixed level mini-maxing program at the basis. > >Now my question, when it was still doing a full width scan, my program would >usually only see 4 ply deep, 5 if you had a lot of patience. However, the >evaluationfunction would cause it to play like it should more or less, I >mean the positional parameters I put in it, but now with alpha beta, it >can usually search 6 to 7 ply deep, but now it tends to see strange deep >threats causing it to play strange countering moves, instead of really >listening to the evaluation parameters like with lower plies. For instance, >it basicly throws open it´s king side pawns when in the evaluationfunction >it says it shouldn´t :) Still, when I limit play to 4 ply even with alpha >beta it plays as before, so I know the alpha beta works right. >Another problem is for instance that it won´t castle, because it keeps >"fishing" for other opportunity´s on deeper ply´s instead, instead of just >setling for the castling bonus, constantly delaying a good move by making >the opponent counter something. This is strange, and on these bigger plies >it constantly wants to do this. Always thinking "i can castle later" for >instance. > >Would this problem only be solvable by extensions? Or can it be solvable >by increasing scores in the evaluation, because I think that when I increase >penalty scores, it becomes dangerous in the way that it then would start >sacrificing to achieve something which isn´t worth that much. = dumb >Anyone ran into this similair problem with their fixed level program? > >Please help out a starting (21 year old) chess programmer, > >Thanks! > > >Stan I do not know. I also think that you have some bug because I never had an experience like this. Uri
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