Passed pawns must be pushed.
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[Event "rated untimed match"]
[Site "?"]
[Date "1969.??.??"]
[Round "?"]
[White "Geller"]
[Black "Ostoic"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "6k1/5r1p/1pqpQ1p1/p7/2P2r2/1P1R4/P5PP/3R3K b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qe4 { There is no good reply to this move. } 2. Qxe4 Rf1+ 3. Rxf1 Rxf1# 0-1