Author: Dadi Jonsson
Date: 15:08:41 09/12/04
Go up one level in this thread
On September 11, 2004 at 20:38:13, Albert Silver wrote:
>On September 11, 2004 at 06:30:54, José de Jesús García Ruvalcaba wrote:
>
>>On September 10, 2004 at 17:18:06, Uri Blass wrote:
>>
>>>I looked at the book secret of chess tactics by mark dvoretsky and in pages
>>>94-100 there is a game of Borkowski against nunn that is discussed
>>>
>>>Nunn claimed after the game that 12...gxf5 could lead to better position for
>>>black.
>>>
>>>The book claims that 13.Nce4!! refutes 12...gxf5 and that the line
>>>13.Nce4 fxe4 14.Nxe4 is winning for white.
>>>
>>>I did not find a convinvcing line against 14...Nb4 or 14...Nc5
>>>What does your program say?
>>>
>>
>>Could you please post a diagram for the relevant position?
>>José.
>
[D]r1bq1rk1/pp1nppb1/n7/4ppN1/3p4/2NB4/PPP3P1/R1BQK2R w KQ - 0 13
>
>However, my analysis seems to reach different conclusions and confirm that White
>is better if not winning. Still the lines are so deep that it is unlikely anyone
>could possibly have found these over the board. I did find one improvement over
>one of his lines though.
>
>Up til 13. Nce4 fxe4 14. Nxe4 Nb4 15. Qh5 Nxd3+ 16. cxd3 f6 17. Qg6 there is
>little doubt.
>
[D]r1bq1rk1/pp1np1b1/5pQ1/4p3/3pN3/3P4/PP4P1/R1B1K2R b KQ - 0 17
>
>Then there are 3 main lines:
>
Thanks for the nice analysis, Albert. You mention 17...Nb6 and 17...Rf7 and as
you show Black is in trouble. There is one more possibility for Black which is
quite interesting, 17...Qe8. Again, the complications are great and Black seems
to take great risk, but in the end I don't see how White can take advantage of
that. After 17...Qe8 White must avoid the exchange of Queens.
[D]r1b1qrk1/pp1np1b1/5pQ1/4p3/3pN3/3P4/PP4P1/R1B1K2R w KQ -
18. Qh7+ Kf7 19. Bh6 Rh8!? 20. Qxg7 Ke6
[D]r1b1q2r/pp1np1Q1/4kp1B/4p3/3pN3/3P4/PP4P1/R3K2R w KQ -
Black has given the piece back, but the pin on the h-file is uncomfortable for
White and he must also avoid the exchange of Queens (e.g. after 21...Qg8). The
game might continue:
21. Qg4+ f5 22. Ng5+ Kd6 23. Qxf5 Nf6 24. Ne4+ Nxe4 25. Qxe4 Qc6 26. Qe2 Be6
[D]r6r/pp2p3/2qkb2B/4p3/3p4/3P4/PP2Q1P1/R3K2R w KQ -
In this position Shredder 8 says:
[-2.57] d=23 27.Rh5 Qd5 28.Bg7 Rxh5 29.Qxh5 Rg8 30.Qg6 Kd7
31.Qg5 Qc6 32.Kd2 Qb5 33.b3 Qc5 34.Rd1 b6 35.Ke1 e4
36.Qe5 Qc3+ 37.Kf2 e3+ 38.Kg3 Rxg7+ 39.Kh2 e2 40.Qxg7 (2:43.57)
The variation I give seems risky, as I said, but is there an improvement for
White that leads to the better game for him?
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