Passed pawns must be pushed.
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[Event "rated untimed match"]
[Site "USSR"]
[Date "1977.??.??"]
[Round "?"]
[White "Domuls"]
[Black "Skonda"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r2q3k/pppb1Q1p/3p1b1p/8/2B5/8/PPP2PPP/4R1K1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Re8+ Bxe8 ( { Black can try: } 1... Qxe8 2. Qxf6# ) 2. Qg8# 1-0