Promotion to queen will end in a draw, but what else can white do? White to begin.
To see the solution: drag the mouse from here... Solution:
1. Nb3+ Kc4 the only square. 2. Nd2+ Kd3 Again the only move left for black. 3. Ne4!! Kxe4 4. b8=Q h1=Q 5. Qb7+ And white wins.