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 "Unknown412"] [Result "1-0"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "5Nk1/1b2p1b1/p3nnQB/1p6/2p5/P1P1P2P/1q3PP1/3r1RK1 w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. Nxe6 ( { White can try: } 1. Rxd1 Be4 2. Rd8 Bxg6 3. Nxe6+ Ne8 ( 3... Kf7 4. Ng5# ) 4. Bxg7 Kf7 5. Rxe8 Kxe8 6. Nf4 Qc1+ 7. Kh2 Bd3 { Black wins with a large material advantage. } ) 1... Rxf1+ 2. Kh2 ( { White can try: } 2. Kxf1 Qa1+ 3. Ke2 Qb2+ 4. Kf1 ( 4. Kd1 Qa1+ 5. Kd2 Ne4+ 6. Kc2 Qxc3+ 7. Kb1 Qb2# ) 4... Qa1+ 5. Ke2 Qb2+ { Draw by repetition of position. } ) 2... Rh1+ 3. Kxh1 Qxf2 ( { Black can try: } 3... Qb1+ 4. Qxb1 { White wins with a large material advantage. } ) 4. Qxg7# 1-0