Some people just don't want to win! My opponent misplayed this ending and allowed me to draw by pushing and exchanging the pawns, a strategy that decreased the power of his knight. The final drawn position had my king holed up at h1 and black could not make any progress promoting the remaining rook pawn nor dislodging my king the corner without falling into a stalemate.
The correct method is 48...Nh2. Although black gives up a piece, he gains a pawn majority that makes this ending possible to win. The f pawn becomes very weak since the black king can move into f3 while he squeezes white by pushes the h pawn. It goes like this: 48...Nh2 49. Kh2 Kf3 50. Kg1 h4 51. Kf1 g4 52. Kg1 h3 53. Kh2 Kf2 ( 53. Kf1 h2 ).