In Fischer's hands, a slight theoretical advantage is as good a being a Queen ahead.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown99"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/1R6/5kp1/p5p1/4KP1P/7r/8/8 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. hxg5+ Ke6 2. Rg7 Kd6 3. Rxg6+ Kc5 4. Ra6 Kb5 5. Ra8 a4 6. f5 Kb6 7. f6 Kb7 8. Rxa4 Rh4+ 9. Kf5 Rxa4 10. f7 Ra2 11. g6 Kc7 12. g7 Rf2+ 13. Ke6 Re2+ 14. Kd5 Rd2+ 15. Ke4 Re2+ 16. Kd3 Re7 17. f8=Q { White wins with a large material
advantage. } 1-0