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 "Bled"]
[Date "1979.??.??"]
[Round "?"]
[White "Ribli"]
[Black "Marjanovic"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "6k1/1p3pPp/p7/2b3B1/P1P2P2/3Q1RPK/4r2P/4q3 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Rxh2+ 2. Kxh2 ( { White can try to run: } 2. Kg4 h5+ 3. Kf5 Qe6# ) 2... Qg1+ 3. Kh3 Qh1+ 4. Kg4 h5+ 5. Kf5 Qh3+ 6. Ke4 ( { White can try: } 6. Kf6 Qe6# ) ( { White can also try: } 6. Ke5 Qe6# ) 6... Qe6# 0-1