A knight on the rim is dim.
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[Event "rated untimed match"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "Unknown"] [Black "Unknown73"] [Result "1-0"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "7r/R1P5/3k1pp1/1KNp4/3P4/8/7r/8 w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. c8=N+ Rxc8 2. Rd7# 1-0