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Subject: Re: Simple Bishop Trap

Author: Jouni Uski

Date: 01:24:39 02/17/99

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On February 17, 1999 at 03:47:25, Amir Ban wrote:

>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?
>
>The bishop is considered trapped at a7, but not at b8, which may be why Junior
>and several other programs (Rebel included) fail here.
>
>Bobby Fischer fell for it against Spassky, so it's quite respectable :)
>
>Amir

Hello Amir. How about game I posted yesterday "Junio5 and "bishop trap" example:
here's the game" In that game Junior fell to a7 I think.



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