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Subject: Re: Question regarding GS 2930 test suite position #13

Author: Uri Blass

Date: 09:44:51 05/22/01

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On May 22, 2001 at 10:09:03, Miguel A. Ballicora wrote:

>On May 22, 2001 at 02:31:37, Uri Blass wrote:
>
>>On May 22, 2001 at 01:40:05, Miguel A. Ballicora wrote:
>>
>>>On May 22, 2001 at 00:02:01, Robert Hyatt wrote:
>>>
>>>>On May 21, 2001 at 15:18:36, Ingo Bauer wrote:
>>>>
>>>>>Here is the right diagram:
>>>>>
>>>>>[D]2r2rk1/p1q1bpp1/1p6/n2R4/8/P4N2/1B2QPPP/5RK1 w - -
>>>>>
>>>>>Following Kasparov, Bxg7 is the winning move. Its from a Game Kasparov -
>>>>>Poritsch 1983. More infos about the complete Test at:
>>>>>http://mitglied.tripod.de/ChessBits/index.html
>>>>>And the un the buttom line GS290. Its in German but the Test should be
>>>>>understandable.
>>>>>
>>>>>Ingo
>>>>
>>>>
>>>>Would be funny if DB Jr is right.  Be nice to tell him "who" found the
>>>>"best" move there.  :)
>>>
>>>This line is facinating, there are some hidden tactics that are not in the PV
>>>that are beautiful, for instance at the end, instead of Qa8, Qb7 looks better
>>>but Ng6!! is excellent (Qxe7/ Nxe7+ Kh7/ Rh5#) and if Rb8 / Rh5! fxg6/ Qe6+ Qf7
>>>/Rh8+ +- (Carbon analysis).
>>>White is threatening at all times Qh4 and it is nice how the white pieces
>>>coordinate to threat Rh8# and have everythind defended. That is why Black
>>>manouver to force the white king to be in h4.
>>>
>>>BUT, Bxg7 is a winning move, no doubt about it, and easier for a human to
>>>evaluate.
>>
>>I have clear doubts if Bxg7 is winning.
>>
>>Can you give me a tree that proves that white has clearly more than +1
>>evaluation.
>>
>>Uri
>
>The game itself looks convincing to me.
>Bxg7 Kxg7/ Ne5 Rfd8/Qg4+ Kf8/Qf5! f6/ Nd7+ Rxd7/ Rxd7

I remember that I analyzed the game and found that black lost by a tactical
error from the point of view of the computer(it was some years ago).
Not all the moves of black were forced in the game.

Uri



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