The passed Pawn is a criminal that must be kept under lock and key. Mild measures, such as police surveillance, are not sufficient.
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[Event "rated untimed match"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "Unknown"] [Black "Unknown93"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "8/5ppk/8/p2P3p/3R4/3rP1P1/5PKP/8 b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Rxd4 2. exd4 Kg8 ( { Black can try: } 2... Kg6 3. d6 Kf6 4. d5 a4 5. h3 a3 6. g4 hxg4 7. hxg4 a2 8. g5+ Kxg5 9. d7 a1=Q 10. d8=Q+ { Draw. } ) 3. Kf3 a4 4. Ke3 a3 5. Kd3 a2 6. Kc2 a1=Q { Black wins with a large material advantage. } 0-1