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 "Unknown83"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/6p1/p2Kp3/P2pP3/2bP3P/8/5k2/4B3 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Kxe1 2. Kxe6 Kf2 3. Kd6 ( { White can try: } 3. Kf5 Ke3 4. e6 Kxd4 5. Kg6 Ke4 6. Kxg7 d4 7. e7 Bb5 8. h5 d3 9. h6 d2 10. h7 d1=Q 11. h8=Q Qa1+ 12. Kh7 Qxh8+ 13. Kxh8 Kd5 14. Kg7 Kc5 15. Kf8 Kb4 16. e8=Q Bxe8 17. Kxe8 Kxa5 18. Kd7 Kb4 19. Kd6 a5 20. Kd5 a4 21. Kd4 a3 22. Kd3 a2 23. Kc2 a1=Q { Black wins
with a large material advantage. } ) 3... Kf3 4. e6 Ke4 5. e7 Bb5 6. Kc7 Kxd4 7. Kb6 Kc4 8. e8=Q Bxe8 9. Kxa6 Kc5 10. Kb7 d4 11. a6 d3 12. a7 d2 13. Kb8 Bc6 14. a8=Q Bxa8 15. Kxa8 d1=Q { Black wins with a large material advantage. } 0-1