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 "Unknown176"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "rn2r1k1/pp3ppp/2pB4/8/2PPn3/5N2/P1b1BPPP/R3R1K1 b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Nxd6 2. c5 Ne4 ( { Black can try: } 2... Nf5 3. Bd3 Nd7 4. Bxc2 { With equal chances. } ) 3. Rac1 Ba4 4. Bd3 Nf6 5. Rxe8+ Nxe8 6. Re1 Nd7 { Black wins with a large material advantage. } 0-1