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 "Unknown157"] [Result "1-0"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "2r2r1k/1b1nq2p/p5p1/1p2bp2/2B1p3/1P2P1P1/PB1QNP1P/2R1R1K1 w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. Qxd7 Qxd7 2. Bxe5+ Qg7 3. Bxg7+ Kxg7 4. Be6 { White wins with a large material advantage. } 1-0