Mate with B + N vs. K

White to move and win.

Basic Guidelines:

• Keep King in opposition or a Knight's move away from the opposing king.
  
• Force the opposing King into a corner of the same color as the Bishop.
  
• Use the Knight to cover flight-squares of opposite color of the Bishop.
  
• Use the Bishop to create Zugzwang positions.
  

(highlight below to see one possible answer)
[
1.Nf2 Kf1 2.Bh2 Ke1 3.Ne4 Kd1 4.Ke3 Kc2 5.Nd2 Kc3 6.Bd6 Kc2 7.Be5 Kc1 8.Kd3 Kd1 9.Bg3 Kc1 10.Nc4 Kd1 11.Ne3+ Kc1 12.Kc3 Kb1 13.Kb3 Kc1 14.Be1 Kb1 15.Bd2 Ka1 16.Nc2+ Kb1 17.Na3+ Ka1 18.Bc3#
]
Source: Fundamental Chess Endings