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 "1970.??.??"]
[Round "?"]
[White "Unzicker"]
[Black "Sarapu"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r1br2k1/pp3ppp/1q1Nn3/3Q4/2B5/8/PPP3PP/R1BK1R2 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Bf4 Nxf4 { It is hard to find a better move. White is a piece up
otherwise. } 2. Qxf7+ Kh8 3. Qg8+ Rxg8 4. Nf7# 1-0