White to play and win.
White king on b3, pawn on g5. Black king on h1, pawns on a5, b4, and h4.
1. Ka4! b3 2. Kxb3! a4 3. Ka3! h4 4. g6! h3 5. g7! h2 6. Kb4! Kg2 7. g8=Q+! Kf1 8. Qd5 Kg1 9. Qd1+ Kg2 10. Qg4+! Kf1 11. Qh3+! Kg1 12. Qg3+ Kh1 13. Qf2! a3 14. Qf1#!