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Interesting Ending Knight + pawn vs Rook - main plans (white and black)

I would like to know the opinion of this ending, but If its possible discuss the main ideas to play it well. I think that black is better, white only have one column to exploit (maybe it can try to open another one in king flank). For black I think that one plan could go Kb6-Kb5-a5 .. but the f7 pawn is always weak and the rook could attack it.

[Event "Android 2.3.5"] [Site "GT-I9001"] [Date "2015.04.20"] [Round "-"] [White "Stockfish 4"] [Black "Mandor"] [Result "*"]

1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.e5 Nfd7 5.Nce2 c5 6.c3 Nc6 7.f4 Qb6 8.Nf3 cxd4 9.cxd4 Be7 10.Nc3 O-O 11.Be2 a6 12.O-O Qa7 13.Be3 b5 14.Qc2 Nb6 15.b3 b4 16.Nb5 Qd7 17.Nd6 Bxd6 18.exd6 Qxd6 19.Ne5 Ne7 20.Bd3 g6 21.Rac1 a5 22.Qc5 Qxc5 23.dxc5 Nd7 24.c6 Nxe5 25.fxe5 Ba6 26.Bxa6 Rxa6 27.Bc5 Nxc6 28.Bxf8 Kxf8 29.Rfe1 Ke7 30.Rc2 Kd7 31.Rf2 Nd8 32.Kf1 Rc6 33.Ke2 Rc2+ 34.Kf1 Rxf2+ 35.Kxf2 Nc6 36.h3 Kc7 37.h4

The best plan that I found go something like this :

37.h4 Kb6 38.Kf3 h6 39.Kg4 Kb5 40.Kg3 a4 41.bxa4+ Kxa4 42.h5 g5 43.Re2 Ka3 44.Kf2 Nd4 45.Rd2 b3

Other Ideas? I enjoy a lot think in global terms, in plans and steps. Someone is think that white is better? Thanks !