Passed pawns must be pushed.
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[Event "rated untimed match"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "Unknown"] [Black "Unknown76"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "r3k2r/ppp2ppp/8/4P3/3qP1n1/P2Q2P1/1PPN2P1/R3K1NR b KQkq - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Qf2+ 2. Kd1 Ne3+ 3. Kc1 Qe1# 0-1