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

Author: Uri Blass

Date: 03:07:19 07/20/04

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On July 20, 2004 at 05:51:31, Uri Blass wrote:

>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
If I analyze some plies later then movei says that Qc7 in that line is not the
best and Rxf4 is better +0.37/14

Uri



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