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 "Unknown675"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "2r3k1/6p1/p1b4p/1p6/3q4/P5P1/1PQ4K/1B4R1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Rf1 ( { White can try: } 1. Qh7+ Kf7 2. Qg6+ Ke7 3. Bf5 Rc7 4. Qe6+ Kf8 5. Be4 Qxb2+ 6. Rg2 Qf6 7. Qxf6+ gxf6 8. Rc2 Ke7 9. Rxc6 Rxc6 10. Bxc6 Kd6 11. Bb7 a5 12. Kh3 b4 13. a4 f5 14. Kh4 b3 15. Bc8 Ke5 16. Ba6 Kd4 17. Bc8 Ke4 18. Be6 b2 19. Ba2 f4 20. gxf4 Kxf4 21. Kh5 Ke3 22. Kxh6 Kd2 23. Kg5 Kc1 24. Kf5 b1=Q+ 25. Bxb1 Kxb1 26. Ke5 Kb2 27. Kd4 Kb3 28. Kc5 Kxa4 29. Kc4 { Rook
pawn draw. } ) 1... Qe4 ( { Black dare not try: } 1... g5 2. Qh7# ) ( { Black can
try: } 1... g6 2. Qxg6+ Qg7 3. Qe6+ Kh8 4. Qxc8+ Qg8 5. Rf8 Bd5 6. Qc3# ) 2. Qxe4 Bxe4 3. Bxe4 { White wins with a large material advantage. } 1-0