Author: Robert Hyatt
Date: 10:07:29 05/22/01
Go up one level in this thread
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
>Material is balanced but the knight is out of the game for a couple of moves
>and the unsafety of the King should count for +1.00 at least. Q+R+R against
>a naked king is bad... Black has a lot of problems and suffer terribly through
>light squares.
>
>Regards,
>Miguel
I played thru the moves above for white, and after that last Rxd7, Crafty gives
Qe5 with a slight plus for white, not "winning" at all. IE after depth=13, the
score is +.33, goes up slightly at 14.
13 1:27 0.33 6. ... Qe5 7. Qh3 Rc7 8. Rd3 f5 9.
Qh6+ Qg7 10. Qf4 Rc3 11. Rd7 Qg5 12.
Qb8+ Kf7 13. Re1 Nc6
(2) 13-> 2:19 0.33 6. ... Qe5 7. Qh3 Rc7 8. Rd3 f5 9.
Qh6+ Qg7 10. Qf4 Rc3 11. Rd7 Qg5 12.
Qb8+ Kf7 13. Re1 Nc6
14 4:08 0.45 6. ... Qe5 7. Qh3 Rc7 8. Rd3 f5 9.
Qh6+ Qg7 10. Qf4 Rc5 11. Qb8+ Kf7 12.
Qxa7 Nc4 13. Rg3 Qd4 14. Re1
Rh5 seems better although I couldn't get DB Jr's score of +1.5 in any reasonable
time (two hours or so).
I guess this leads to Uri's question (again) of "does Bxg7 actually win or
not?"
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