Author: Jeremiah Penery
Date: 17:13:58 12/05/99
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On December 05, 1999 at 19:52:29, Vincent Diepeveen wrote: >On December 04, 1999 at 18:52:55, Jeremiah Penery wrote: > >>On December 04, 1999 at 18:32:15, Dave Gomboc wrote: >> >>>On December 04, 1999 at 18:18:07, Jeremiah Penery wrote: >>> >>>>On December 03, 1999 at 13:20:46, Vincent Diepeveen wrote: >>>> >>>>>Dusan, if you add a huge penalty for having opposite bishops in endgame, >>>>>does PHalanx play 36.axb5! in the deep blue - kasparov game then (game 2), >>>>>at say 11 ply depth, or does it need a bit bigger depth? >>>>> >>>>>I assume if so that it plays 37.Be4? too (Qb6 wins forced there). >>>> >>>>No. Qb6 is a forced draw there. If I have time soon, I'll try to make some >>>>analysis and post it. IIRC, black will force a repetition. >>> >>>It would be nice to settle this, so that people don't have to hash it out for >>>another couple of years. Analysis is welcome, but it might be a good idea to >>>look back into the archives so you're not starting over from scratch. >> >>I agree. If I had the full archives of CCC, or had any idea where (when) to >>look, this is where I'd start. Other than that, I'll definitely search Deja >>first. >>I do remember letting Crafty search this one for a _very_ long time. Sometime >>around depth 20, it showed Qb6 with a score of 0.00, then switched to Be4 with >>+0.20. > >crafty has a huge penalty for opposite bishops in the endgame. Not really a huge penalty. It is (score-Material)>>1 + Material - The only penalty is half the positional score, which isn't very much in such an ending anyway. But if it shows a repetition, that's a draw anyway, no matter what the material or the position.
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