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 "Unknown603"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "rnb1k1nr/pppp3p/6pb/P3Pp2/1q6/2NK1N2/2P4P/R1BQ1B1R w kq f6 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Ba3 Qxa5 2. Bd6 Qb6 3. Nd5 Qc6 4. Nxc7+ Kd8 5. Nxa8 b5 6. Ke2 Qe4+ 7. Kf2 Be3+ 8. Ke1 Bb7 9. Bxb5 Bxa8 10. Rf1 { White wins with a large material
advantage. } 1-0