Suddenly it was obvious to me in my analysis I had missed what Fischer had found with the greatest of ease at the board.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown192"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "1r4k1/Q4pp1/n3p2p/q7/3P4/P3P3/1PK2PPP/R6R b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qf5+ { White can try: } 2. Kc1 ( { White can try: } 2. Kd1 Rxb2 3. Qa8+ Nb8 4. Qf3 Qc2+ 5. Ke1 e5 6. d5 e4 7. Rc1 Qd2+ 8. Kf1 Qxc1+ 9. Qd1 Qxd1# ) 2... Qxf2 3. Ra2 Rc8+ 4. Kb1 Qc2+ 5. Ka1 Qc1+ 6. Rxc1 Rxc1# 0-1