Passed pawns must be pushed.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown83"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "4R3/pp4P1/2p1b3/5k2/7p/2P2P2/Pr6/6K1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Rxe6 Kxe6 2. g8=Q+ { White wins with a large material advantage. } 1-0