Author: John Merlino
Date: 17:45:52 09/10/04
Go up one level in this thread
On September 10, 2004 at 19:18:48, Uri Blass wrote:
>On September 10, 2004 at 18:46:58, John Merlino 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?
>>>
>>>
>>>[Event "10'/40"]
>>>[Site "MyTown"]
>>>[Date "2004.09.10"]
>>>[Round "?"]
>>>[White "New game"]
>>>[Black "Yace 0.99.87"]
>>>[Result "*"]
>>>[ECO "B09"]
>>>[Annotator ",agur"]
>>>[PlyCount "39"]
>>>[TimeControl "40/600:0/0:0/0"]
>>>
>>>{512MB, Fritz8.ctg, URI-AMD
>>>} 1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. f4 Nf6 5. Nf3 O-O
>>>6. Bd3 Na6 7. e5 Nd7 8. h4 c5 9. h5 cxd4 10. hxg6 hxg6 11. Ng5 dxe5 12. f5 gxf5
>>>13. Nce4 fxe4 14. Nxe4 Nb4 (14... Nac5) 15. Qh5 (15. Bc4 Nd5 16. Bh6 Bxh6 (
>>>16... N7f6 17. Nxf6+ Nxf6 18. Bxg7 Qa5+ 19. c3 dxc3 20. b4 Qxb4 21. Bxf8 Qxc4
>>>22. Bxe7 Qe4+) 17. Rxh6 N7f6 18. Nxf6+ Nxf6 19. Qd2 Nh7 20. O-O-O Bf5 21. Rdh1
>>>e6 22. Rxh7 Qf6 23. R7h6 Qg7 24. g4 Be4 25. R1h5 Bg6 26. Rh8+ Qxh8 27. Rxh8+
>>>Kxh8 28. Qh6+ Kg8 29. Bxe6 Bxc2 30. Kxc2 fxe6 31. Qxe6+ Kh7 32. Qxe5 Rf2+ 33.
>>>Kb3 Raf8 34. Qe4+ Kg8 35. Qg6+ Kh8 36. g5 Rh2) 15... Nxd3+ 16. cxd3 f6 17. Qg6
>>>Nb6 (17... Rf7 18. Qh7+ Kf8 19. Bh6 Qa5+ 20. Kf2 Ke8 21. Bxg7 Nf8 22. Qh5) 18.
>>>Rh7 Rf7 19. Bh6 Qf8 20. Ng3 *
>>>
>>>
>>> Uri
>>
>>Playing through some possibilities with CM9_SKR, The King prefers this line:
>>
>>14...Nb4 15.Qh5 Nxd3+ 16.cxd3 f6 17.Qh7+ Kf7 18.0-0?! Nc5 19.Bh6 Nxe4 20.Qxg7+
>>Ke6 21.Qg4+ Kd6 22.Qxe4
>>
>>But the eval is about -1.7 in Black's favor. As you say, it doesn't look
>>convincing to me. Did the book give any continuation after 14.Nxe4?
>>
>>jm
>
>Yes
>Here are some lines that it gave(I am not going to post all the lines but it
>analyzed many possibilities for black at move 14 and I give al;l the
>possibilities it analyzed)
>
>14...Nf6 15.Nxf6+
>14...Qb6 15.Qh5 Qg6 16.Qxg6 fxg6 17.Bc4+ with advantage for white
>14...Re8 15.Qh5 Nf6 16.Nxf6+ exf6 17.Bh6 Kf8 18.Bxg7+ Ke7
>14...Re8 15.Bh6 is also analyzed when they claim it may be stronger than 15.Qh5
>14...e6 15.Qh5 f5 16.Qh7+ Kf7 17.Bg5 Qb6(Qa5+ Ke2) 18.Qh5+ Kg8 19.Qg6 Rf7
>20.Rh8+
>14...f6 or 14...f5 15.Bc4+
>
>Uri
So the book doesn't even consider the fairly obvious 14...Nb4 at all? Very
strange....
Admittedly, it takes CM9_SKR 0:29 to find 14...Nb4, but it certainly seems like
a GM would at least consider this move (or, as you say, 14...Nac5, which
transposes to the same line).
jm
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