Passed pawns must be pushed.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown442"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "4r1k1/5pP1/p6p/1p5R/6P1/P1pQq2P/1PP5/1K6 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qc1+ ( { Black can try: } 1... Qe1+ 2. Ka2 cxb2 3. Kxb2 Kxg7 4. Qd4+ f6 5. g5 hxg5 6. Rxg5+ Kf7 7. Rd5 Re4 8. Qa7+ Re7 9. Qxa6 Rc7 10. Qxb5 Qc3+ 11. Ka2 Qxc2+ 12. Qb2 Qe4 13. Qb3 Rc2+ 14. Ka1 Rc1+ 15. Ka2 Rc2+ 16. Ka1 Rc1+ 17. Ka2 { Draw by repetition of position. } ) 2. Kxc1 Re1+ 3. Qd1 Rxd1+ 4. Kxd1 cxb2 5. Rxh6 b1=Q+ { Black wins with a large material advantage. } 0-1