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 "Kasparov, Garry"]
[Black "Ribli, Zoltan"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "5rk1/5ppp/p1Q1p3/1r6/q2b4/4B1P1/P2RPP1P/1R4K1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Rxb5 Bxe3 ( { Black can try: } 1... Qxb5 2. Qxb5 axb5 3. Rxd4 { White wins
with a large material advantage. } ) 2. Rd8 Rxd8 ( { Black can try: } 2... Qxb5 3. Qd6 h6 4. Qxf8+ Kh7 5. Qxf7 Bg5 6. Qg8+ Kg6 7. Qxe6+ Bf6 { White wins with
a large material advantage. } ) 3. Rd5 Qd4 4. Rxd4 Bxd4 5. e3 Bf6 6. Qxa6 { White wins with a large material advantage. } 1-0