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 "Unknown467"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "5r1k/1p4pp/p2b4/2p5/8/P2PBP1q/1PP1Q2P/5R1K b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Re8 ( { Black can try: } 1... Bxh2 2. Qg2 Qe6 3. Re1 Bf4 4. Bf2 { With a likely draw. } ) 2. Rf2 Bf4 3. Rg2 Rxe3 4. Qf2 Rxf3 5. Qg1 Be3 6. Qe1 h6 { Black wins with a large material advantage. } 0-1