Author: Robert Hyatt
Date: 10:55:49 02/15/99
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On February 15, 1999 at 08:01:14, Steffen Jakob wrote: >On February 15, 1999 at 05:58:35, Jeff Anderson wrote: > >>On February 15, 1999 at 03:22:50, Jouni Uski wrote: >> >>>In was quite surprised, that in two consecutine(!) tournament game between >>>Junior 5 and Crafty 16.3 Junior eats a7 pawn with bishop. So after b6 bishop is >>>lost. I have never seen Mchess or Rebel even considering that. Hmmm... >> >>I believe that Crafty has something in its eval that keeps it from playing this >>move even when it cannot actually see the bishop being captured after it's >>trapped. Is there any test position to see if a program will do this or not? > >I just cannot believe that Amir has simply forgotten to implement a "trapped >bishop" penalty. Amir? It is probably a 'speed' trade-off issue. I have seen Junior do this. I have seen Nimzo do this. I'm not sure I have seen it from fritz, but I am not sure. I have seen gnuchess and several others do the same thing as well. Lonnie could probably tell us everyone that does it, as I have seen a couple of <expletive deleted>'s out of him in some computer chess matches we have played on several servers. That code is not free, although it is not horribly expensive. But the reason you saw it more than once is that crafty appears to 'set the trap' because it _knows_ that the pawn won't be taken, so it doesn't even try to defend it. Which lets a program that doesn't know about this have several opportunities to fall for it. I didn't plan that, I just got tired of seeing _my_ program fall for it. :)
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