A knight on the rim is dim.
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[Event "rated untimed match"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "Unknown"] [Black "Unknown274"] [Result "1-0"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "3r4/5k2/8/8/7r/6R1/R5K1/8 w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. Rf2+ Ke6 2. Re3+ Kd5 3. Rd3+ Rd4 4. Rxd4+ Kxd4 5. Rd2+ Ke3 6. Rxd8 { White wins with a large material advantage. } 1-0