Passed pawns must be pushed.
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[Event "rated untimed match"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "Unknown"] [Black "Unknown61"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "8/8/p7/N6p/1p1k1K1P/8/8/8 b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Kc3 2. Kg5 b3 3. Nxb3 Kxb3 4. Kxh5 a5 5. Kg6 a4 6. h5 a3 7. h6 a2 8. h7 a1=Q 9. Kf7 Qh8 10. Kg6 Kc4 11. Kh6 Kd5 12. Kg6 Ke6 13. Kh6 Kf5 14. Kh5 Qxh7# 0-1