Author: Matthew White
Date: 15:11:30 07/02/03
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On July 02, 2003 at 15:04:12, Andrei Fortuna wrote: >On July 02, 2003 at 14:42:36, Matthew White wrote: > >>How do you get a program to develop its pieces if you ignore time? Yes, >>piece-square tables are helpful, but how do you keep a program from chasing a >>piece that it thinks it can exchange, but which will result in letting the >>opponent develop his pieces comfortably and start an attack? I realize that we >>use opening books specifically to avoid having to think about these issues, but >>sometimes when opening books end early, I have seen engines un-develop a piece >>that the book just finished developing! > >I have seen this kind of behaviour in my Freyr sometimes. It's because it >doesn't understand the spirit of the position it finds itself when exiting the >opening book and panics. > >Quickest answer would be opening books and piece squares. >Might work giving a small penalty for undeveloped pieces for the first 10 moves >(as a Master friend advised me) but this "first 10 moves" thing is tricky >because after that you have to clear the hashtable as the rules have slightly >changed and you do not want to find hashentries scored by old rules. > >A refinement would be to select opening book lines suited to the playing style >of your program but that takes lots of work and it needs a very strong player >with opening knowledge. > >Without opening book and piecesquares I guess a set of rules would have to be >established, all centered on developing the pieces to good squares. > >How do you define tempi in a chess program ? I am not sure how I could do that >programatically speaking). > >Andrei Defining tempi is a very difficult question... I am not exactly sure how to do it. The only straightforward way that I can think of doing it in an opening is to count the number of pieces that have been moved from their original squares (or the number of moves remaining to connect the rooks), and to do the same for the opponent. The difference is the time advantage/disadvantage. I believe that most programs ignore time as a factor, but I could be wrong. I think it would be a big step towards improving opening play if we could figure out a way to incorporate tempo, though... Matt
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