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 "Veresov"]
[Black "Buslaev"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "3rr1k1/pp3pbp/2bp1np1/q3p1B1/2B1P3/2N4P/PPPQ1PP1/3RR1K1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Bxf6 Bxf6 2. Nd5 Qxd2 3. Nxf6+ Kh8 4. Rxd2 { White wins with a large
material advantage. } 1-0