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Subject: Re: Test Position - Exchange sac - some programs shoot it out...

Author: Uri Blass

Date: 02:51:31 07/20/04

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On July 20, 2004 at 05:36:08, Uri Blass wrote:

>On July 20, 2004 at 04:54:30, martin fierz wrote:
>
>>On July 20, 2004 at 02:44:33, Roy Brunjes wrote:
>>
>>>Earlier I posted about this position with the question "Is the exchange
>>>sacrifice 13. ... Rxf4!? sound?"
>>>
>>>[D] r1b3k1/pp2n1b1/1qn1prpp/2pp4/5B1P/2PP1NP1/PPQ2PB1/RN3RK1 b - - 0 13
>>>
>>>Some readers thought it should be, others were not so convinced they would play
>>>it themselves in a game (not necessarily a vote for or against the soundness,
>>>just that they might not play that move themselves in a game).
>>
>>just for the record, the strong players liked it very much, while the weak
>>players doubted it's soundness...
>>
>>cheers
>>  martin
>
>As far as I see movei of today has no chance to find it.
>It can see enough compensation but it evaluates alternatives as better for black
>and even after Rxf4 exf4 Bd7 it can see only +0.27 for black at depth 15 when
>the score before Rxf4 was near +0.4 for black.

And now at depth 15 it changes it's mind from Re1 to Nbd2 with only +0.24 for
black.

I did not see other programs play Nbd2 in the posted games so maybe Nbd2 is a
better try to defend white's position.

Main line starts Nbd2 Rf8 Rae1 Qc7

Uri

Uri

Uri



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