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 "Unknown304"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "4n3/3rkp1p/Rp1p2p1/1P1r4/8/1P4P1/4PPBP/6K1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Bxd5 Nc7 2. Bb7 Nxa6 3. bxa6 Rc7 4. Kg2 Rc1 5. a7 Ra1 6. a8=Q Rxa8 7. Bxa8 { White wins with a large material advantage. } 1-0