A knight on the rim is dim.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown417"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/5R2/7P/6K1/4kp2/8/8/7r w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Rxf4+ Ke5 2. Rg4 ( { White can try: } 2. Rh4 Rxh4 3. Kxh4 Kf6 4. Kh5 Kf7 5. Kg5 Kg8 { Draw. } ) 2... Ke6 3. Kg6 Ke7 4. Kg7 Rf1 5. h7 Rf7+ 6. Kh6 Rf8 7. Rg7+ Kf6 8. Rg8 Kf7 9. Rxf8+ Kxf8 10. h8=Q+ { White wins with a large material
advantage. } 1-0