Author: Andreas Stabel
Date: 07:59:39 11/25/99
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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. Regards Andreas Stabel
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