Author: Ulrich Tuerke
Date: 08:41:24 11/25/99
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On November 25, 1999 at 10:59:39, Andreas Stabel wrote: >On November 25, 1999 at 10:11:58, Ulrich Tuerke wrote: > >>I find your results very interesting. >> >>What puzzles me, is the large branching ratio from one iteration to the next one >>which you obtained. I'd thought, that you get a factor of 4 to 5, provided you >>have a resonable move ordering, whereas you have factor of ~20. Could it be that >>your move ordering is very poor ? >> >>I assume, with an improved move ordering, the effects, which you have observed, >>will also become less drastic. >> >>Nevertheless, it might be worthwhile to try your suggestion regarding en >>passant. >> >>Thanks, >>Uli > >Remember that this is NOT a chess playing program, only a pure tree scanning >one. To get a branch factor of 4 to 5 you need an evaluation and an alpha- >beta algorithm which I don't have in this system. > >Your observation that alpha-beta and a good evaluation and move ordering >will reduce the effects I have found is of course correct. But I still >think clearing the en passant target square when it is not necessary is >so simple that it may have an effect on the speed of a chess program. Yes, I think that I will try your suggestion. Thanks, Uli > >Regards >Andreas Stabel
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