Author: Hristo
Date: 21:13:33 09/11/04
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:
>
>The shortest is 15... Nxd3+ 16. cxd3 f6 17. Qg6 Nb6 18. Rh7 Rf7 19. Bh6 Qf8 20.
>Ng3
>
>[D]r1b2qk1/pp2prbR/1n3pQB/4p3/3p4/3P2N1/PP4P1/R3K3 b Q - 0 20
>
>which is completely winning position for White.
Indeed. You are correct. I wanted to improve on the 20. Ng3, but there is no
reason (possibility) to improve this position for white; it is already quite
improved. :-)
>
>And the next line, where I found an improvement over Uri's main line:
>
>17... Rf7 18. Qh7+ Kf8 19. Bh6 Qa5+
>
>[D]r1b2k2/pp1nprbQ/5p1B/q3p3/3pN3/3P4/PP4P1/R3K2R w KQ - 0 20
>
>However, instead of 20. Kf2? Ke8 21. Bxg7 Nf8 22. Qh5
>
>[D]r1b1kn2/pp2prB1/5p2/q3p2Q/3pN3/3P4/PP3KP1/R6R b - - 0 22
>
>which allows Black to get away with a draw at the very worse with 22...f5! 23.
>Ng5 24. Qd2+
>
>20. Kf1!! seems to be winning, but the lines are so deep that as said, even
>though it may be an objective win, I don't know how findable this all would be.
This looks cool ... thank you for giving me a reason to play my wooden pieces
some more.
:-)
Cheers,
Hristo
>
>The key difference is that there is no check on d2 after f5, and after
>20...Qb5!? 21. Kg1 allows the rook to enter on f1 with devastating effect,
>though don't expect the engines to see this anytime soon BTW.
>
>23. Kg1 Qxb2 24. Rf1 Be6 25. Bxf8 Qxa2 26. Qg6 Kd7
>
>[D]r4B2/pp1kpr2/4bpQ1/4p3/3pN3/3P4/q5P1/5RKR w - - 0 27
>
>Now the Black king is in big trouble:
>
>27. Bxe7 Rxe7 28. Rh7! (trading off the defending rook) Rg8 29. Nxf6+ Kd6 30.
>Nxg8 Rxh7 31. Qxh7 Bxg8
>
>[D]6b1/pp5Q/3k4/4p3/3p4/3P4/q5P1/5RK1 w - - 0 32
>
>Although it may seem that Black has managed to survive, but the queen and rook
>are able to mop up the rest:
>
>32. Qxb7 Bd5 33. Rf6+ Kc5 34. Qe7+ Kb5 35. Rf2 Qb1+ 36. Kh2 Qxd3 (36... Qc1 37.
>Qe8+ Qc6 38. Qb8+ Ka6 39. Qf8 Qc3 40. Qd6+ Bc6 41. Qc7 Ba4 42. Rf6+ Kb5 43. Qb7+
>Kc5) 37. Rb2+ Bb3 38. Qa3 Kc6 39. Rxb3 *
>
> Albert
>
>Below is the PGN with my added lines:
>
>[Event "10'/40"]
>[Site "Private"]
>[Date "2004.09.10"]
>[Round "?"]
>[White "Dvoretsky"]
>[Black "Uri"]
>[Result "*"]
>[ECO "B09"]
>[Annotator ""]
>[PlyCount "77"]
>[TimeControl "40/600:0"]
>
>{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 (16. Qh5
>N7f6 17. Qh4 Bf5 18. Bh6 Ng4 19. Bxg7 Kxg7 20. Qg5+ Bg6 21. Qxg4) 16... 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
>Rf7 (17... Nb6 18. Rh7 Rf7 19. Bh6 Qf8 20. Ng3) 18. Qh7+ Kf8 19. Bh6 Qa5+ 20.
>Kf1 (20. Kf2 Ke8 (20... e6 21. Nd6 Qb4 22. Nxf7 Bxh6) 21. Bxg7 Nf8 22. Qh5 f5
>23. Ng5 Qd2+) 20... Ke8 21. Bxg7 Nf8 22. Qh5 Qb5 (22... f5) 23. Kg1 Qxb2 24.
>Rf1 Be6 (24... Qxa2 25. Bxf8) 25. Bxf8 Qxa2 26. Qg6 Kd7 27. Bxe7 Rxe7 (27...
>Kxe7 28. Rh7 Raf8 29. Qxf6+ Ke8 30. Nd6+) 28. Rh7 Rg8 29. Nxf6+ Kd6 30. Nxg8
>Rxh7 31. Qxh7 Bxg8 32. Qxb7 Bd5 33. Rf6+ Kc5 34. Qe7+ Kb5 35. Rf2 Qb1+ 36. Kh2
>Qxd3 (36... Qc1 37. Qe8+ Qc6 38. Qb8+ Ka6 39. Qf8 Qc3 40. Qd6+ Bc6 41. Qc7 Ba4
>42. Rf6+ Kb5 43. Qb7+ Kc5) 37. Rb2+ Bb3 38. Qa3 Kc6 39. Rxb3 *
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