Author: Robert Hyatt
Date: 19:52:58 02/16/99
Go up one level in this thread
On February 16, 1999 at 21:17:30, Howard Exner wrote: >On February 16, 1999 at 18:56:17, John Stanback wrote: > >>On February 15, 1999 at 20:48:35, Howard Exner 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... >>> >>>7k/ppp1bpp1/7p/8/8/1P1PB2P/1P3PP1/5K2 w >>> >>>Is this the kind of example you were considering? >>>Sometimes its ok to take the pawn as the bishop can escape >>>but in the above example it would be a relatively easy task for >>>a human to avoid the move Bxa7. How do programs handle this position? >> >>Zarkov has knowledge for this and does not take the pawn, but plays Ke2. >> >>John > >I tried this on Rebel 10 but it stuck to Bxa7 even after an hour (K6-233). >I'm glad someone posted there results on this one as I think code for this >is essential. Will the code also prevent taking such a pawn when it is the >right choice? Or is it a type of code/knowledge that plays the odds? This is one of the harder forms of this. Most commonly it happens with rooks still on the board. In my case, crafty will play Bxa7, because the bishop isn't trapped at a7, it can also go to b8. And it is one of those positions that is very dangerous either way... IE can white push a pawn quickly enough to break the trap before black's king gets over there? If black had a rook here my program would never consider this. But in this example, it would...
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