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 "Unknown469"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r2q1rk1/pb1n1ppp/1p2p3/2bpB1P1/8/2NBP3/PPP2P1P/R2QK2R w KQ - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Bxh7+ Kxh7 2. Qh5+ Kg8 3. Bxg7 Kxg7 4. Qh6+ Kg8 5. g6 Nf6 6. Rg1 ( { White
can try: } 6. g7 Nh7 7. Rg1 Re8 8. Rg3 f5 9. Rh3 Ng5 10. Qh8+ Kf7 11. Qh5+ Kxg7 12. Rg3 Be7 13. f4 Rh8 14. Rxg5+ Bxg5 15. Qxg5+ Qxg5 16. fxg5 { Black
wins with a large material advantage. } ) 6... Qd7 7. g7 Nh7 8. gxf8=Q# 1-0