Passed pawns must be pushed.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown175"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[ECO "A00"]
[FEN "8/8/6k1/1p3p2/p4P2/Pr1N1B2/1P1K3p/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... b4 2. axb4 Rxb2+ 3. Nxb2 a3 4. Bd5 a2 5. Bxa2 h1=Q { Black wins with a
large material advantage. } 0-1