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 "Lasker"]
[Black "Aualla"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "4k2r/p1q1np1p/1p2p1p1/2p1P1B1/6Q1/2P5/PP4PP/3R2K1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Qa4+ Nc6 ( 1... Qc6 2. Rd8+ ( { This is winning also: } 2. Qxa7 Nd5 3. Rxd5 Kf8 4. Qe7+ Kg8 5. Rd8+ Kg7 6. Qf6# ) 2... Kxd8 3. Qxc6 { White wins with a large
material advantage. } ) 2. Qxc6+ Qxc6 3. Rd8# 1-0