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 "1972.??.??"]
[Round "?"]
[White "Ivanov"]
[Black "Litvinov"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r4rk1/7p/p2p1p2/1pn2B1p/3bP3/Q2N3P/1P2qPP1/2R3RK w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Nxc5 Bxc5 ( { Black can try: } 1... dxc5 2. Qg3+ Kh8 3. Qc7 h4 4. Qxh7# ) 2. Rxc5 dxc5 3. Qg3+ Kh8 4. Qc7 h4 5. Qxh7# 1-0