hey guys,
i just played an endgame where i knew that i obviously was better but had no idea how to win it.
How should i procede after move 45?
I am black obviously

[Event "Wertungspartie, 10m + 0s"]
[Site "Großer Spielsaal"]
[Date "2010.08.29"]
[Round "?"]
[White "Schwammkopf"]
[Black "Lennske"]
[Result "1/2-1/2"]
[ECO "B50"]
[WhiteElo "1099"]
[BlackElo "970"]
[Annotator "Doe,John"]
[PlyCount "134"]
[EventDate "2010.08.29"]

1. e4 c5 2. Nf3 d6 3. Bc4 Nf6 4. Nc3 Nc6 5. h3 e6 6. O-O Be7 7. Re1 O-O 8. d3
d5 9. exd5 exd5 10. Bb5 d4 11. Ne4 a6 12. Bc4 b5 13. Bb3 c4 14. dxc4 bxc4 15.
Bxc4 Bb4 16. c3 dxc3 17. Qxd8 Rxd8 18. bxc3 Nxe4 19. Rxe4 Bxc3 20. Rb1 Bf5 21.
Re3 Bxb1 22. Rxc3 Be4 23. Ng5 Ne5 24. Nxe4 Nxc4 25. Rxc4 Re8 26. Nd6 Red8 27.
Nb7 Rd1+ 28. Kh2 g6 29. Be3 a5 30. Ra4 h6 31. Rxa5 Rxa5 32. Nxa5 Ra1 33. Bxh6
Rxa2 34. Nc4 Rxf2 35. Be3 Rc2 36. Ne5 f5 37. Nxg6 Kg7 38. Nh4 Kf6 39. Bd4+ Kg5
40. Nf3+ Kf4 41. Bg7 Re2 42. Nd4 Re7 43. Bh6+ Ke4 44. Nc6 Re6 45. Nd8 Rxh6 46.
Nf7 Rf6 47. Nd8 f4 48. Nb7 Rb6 49. Nc5+ Kf5 50. Nd3 Rb3 51. Nc5 Rb5 52. Nd3 Rd5
53. Nf2 Rd2 54. Kg1 Rc2 55. Nd3 Ke4 56. Nf2+ Ke3 57. Ng4+ Ke4 58. Nf2+ Kd4 59.
Ng4 Rc3 60. h4 f3 61. gxf3 Rxf3 62. Kg2 Rf5 63. Kg3 Ke4 64. Nh6 Rf6 65. Ng4 Rf5
66. Nf2+ Ke5 67. Ng4+ Ke4 {(Lag: Av=0.46s, max=2.5s)} 1/2-1/2

Replayer link:
http://www.chessvideos.tv/chess-game...r.php?id=33978

ty in advance

even after you win the piece it's a draw.

The easiest way for white to get it would be to keep the B, play g3 and put the B on the h2-b8 diagonal. This way black can't advance his pawn or create anything so it's an easy draw.

When he keeps the N he should still have a draw. mostlikely putting the N at f3 will ensure it.

however after 47 Nd8 Kd5 will trap the knight after Rf8. Nb7 Rb8. Na5 Rb5. But if he plays correct I would think it's a draw even after 45.

Well, I don't really know for sure, but I did play around with a 6-man tablebase: http://www.k4it.de/index.php?topic=egtb&lang=en

Problem is, you don't have 6 pieces left until move 61 (then it is a draw). But I took the position at move 45 and removed your pawn -- mate for black in 31 moves. Not sure how that changes with the pawn put back.

In this thread, I analyzed two endgames, including a game with a knight and seven pawns against a rook and four pawns.

Learn to Love Endgames

I think you'll find the thread useful.

As was mentioned, you missed a chance to win by trapping the Knight with 47.Kd5. In general, when you have an opponent's Knight isolated like this in an endgame, you should try to find a way to trap it, or at least keep it from getting back into the game. Once the Knight gets back to f2, I don't know if you have a win any more - the position needs more careful analysis.