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 "Unknown41"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "q4r1k/4p1bp/pp1pQn2/4n3/2P2P2/PP2B2P/4B1P1/2RR2K1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qe4 { White can try: } 2. fxe5 ( { White can try: } 2. Bxb6 Nf3+ 3. Bxf3 Qxe6 { Black wins with a large material advantage. } ) 2... Qxe3+ 3. Kh2 ( { White can
try: } 3. Kh1 Ne4 4. Bg4 Nf2+ 5. Kh2 Bxe5+ 6. Kg1 Nxd1+ 7. Kh1 Qe1# ) 3... Ne4 4. Bf3 Bxe5+ 5. Kh1 Nf2+ 6. Kg1 Nxd1+ 7. Kh1 Qe1# 0-1