Author: Dieter Buerssner
Date: 14:25:48 11/15/05
Go up one level in this thread
On November 14, 2005 at 15:51:09, George Tsavdaris wrote:
>On November 14, 2005 at 11:25:28, Vincent Lejeune wrote:
>
>>[d]6k1/1p1r1pp1/3p3p/NP1Pp1n1/P3P2n/8/5K1P/4RB2 w - - 0 34
>>
>>Nxb7!
>
>Some more analysis that "proves" Nxb7 is winning:
Yes, I arrive at the same conclusion. Few comments follow:
>[Event "20'/40"]
>[Site "Thessaloniki"]
>[Date "????.??.??"]
>[Round "?"]
>[White "New game"]
>[Black "?"]
>[Result "*"]
>[SetUp "1"]
>[FEN "6k1/1p1r1pp1/3p3p/NP1Pp1n1/P3P2n/8/5K1P/4RB2 w - - 0 1"]
>[PlyCount "15"]
>[TimeControl "40/1200:0/0:0/0"]
>
>1. Nxb7 Rxb7 2. a5 f5 (2... Rc7 3. b6 Rc2+ 4. Re2 Nxe4+ 5. Kg1 Nf3+ 6. Kh1 $1
>Rc1 7. Rxe4 Rxf1+ 8. Kg2 Rb1 9. Kxf3 Kf8 $18) 3. a6 Rc7 4. exf5 $1 (4. b6 Rc2+
>5. Re2 (5. Kg3 f4+ 6. Kxh4 Rxh2+ 7. Kg4 Kf7 8. Re2 Rh1 9. Bg2 Rh2 10. Bf1 $11)
>5... Nxe4+ 6. Kg1 Nf3+ 7. Kh1 Rc1 8. Rxe4 $1 (8. b7 $2 Kh7 9. Rxe4 fxe4 10. Kg2
^
The variantion starting here seems not totally clear yet. I also did not look at
it too careful. Are you confident, that it is =? It seems, white has some
alternatives.
Yace finds 8. Rxe4 in reasonable time, Shredder PB did not find it in 20
minutes, and shows around +2 for b7. It might be a good test position, too.
>Rb1 11. a7 Rxb7 12. a8=Q Rb2+ 13. Kh3 Rxh2+ 14. Kg3 h5 15. Qe8 h4+ 16. Kg4 Rf2
>17. Bh3 Nd4 18. Kg5 e3 19. Be6 Nxe6+ 20. dxe6 Rg2+ 21. Kxh4 Rh2+ 22. Kg5 Rg2+
>23. Kf5 g6+ 24. Ke4 e2 25. Qe7+ Kg8 26. Qf7+ Kh8 27. Qf6+ Kg8 28. Qd8+ Kg7 29.
>Qa5 Kf6 30. Kf3 Rh2 31. Qd2 Kxe6 $11 32. Kg3 Rh5 33. Qxe2 $11) 8... fxe4 $11 9.
^
I guess, the $11 (meaning "=") is a typo here, yes? White should win (as
indicated by $18 at the end of the line).
>Kg2 Kh7 10. a7 Ra1 11. b7 Rxa7 12. b8=Q Ra2+ 13. Kg3 Nd4 14. Qb1 Nf5+ 15. Kh3
>Ra4 16. Bb5 Rd4 17. Bd7 $18) 4... Rc2+ 5. Re2 Ne4+ 6. Kg1 Nf3+ 7. Kh1 Rc1 8.
>Rxe4 $18 *
Seems, it is not too easy, to win here, even after 1. Nxb7
Regards,
Dieter
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