Passed pawns must be pushed.
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[Event "rated untimed match"] [Site "?"] [Date "1905.??.??"] [Round "?"] [White "Tartakover"] [Black "Schlechter"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "2k3r1/1pp5/p1p5/4R2p/7n/2NP1r1P/PPP4K/6R1 b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Rf2+ 2. Kh1 Rh2+ 3. Kxh2 Nf3+ 4. Kh1 Rxg1# 0-1