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Subject: Re: Transferring eval to deep blue game

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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