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 "Unknown334"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "3K4/kpQP4/p4p2/1qb5/8/1B6/P5P1/8 b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Bb6 2. Qxb6+ Kxb6 ( 2... Qxb6+ 3. Ke7 Qc5+ 4. Kf7 Qc7 5. Ke8 Qe5+ 6. Kf7 Qd6 7. Ke8 { Draw. Neither side can make progress. } ) 3. Ke7 Qc5+ 4. Kf7 Qc7 5. Ke8 Qe5+ 6. Kf7 Qd6 7. Ke8 Kc7 8. Ba4 b5 9. Bb3 Qxd7+ { Black wins with a large material advantage. } 0-1