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 "Unknown327"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "1k1r3r/1P4p1/1Qp2p2/6q1/2P5/3P1n2/5R1P/1R3K2 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Qa7+ ( { White can try: } 1. Rxf3 Rxd3 2. Rf2 ( 2. Rxd3 Qf5+ 3. Kg1 Qxd3 4. Ra1 Qg6+ 5. Kh1 Qe4+ 6. Kg1 Qg4+ 7. Kh1 ( 7. Kf1 Qh3+ 8. Ke1 Qc3+ 9. Kf1 Qxa1+ { Black wins with a large material advantage. } ) 7... Qf3+ 8. Kg1 Qg4+ { Draw by
repetition of position. } ) 2... Qe3 3. Qxe3 Rxe3 4. Ra2 Kc7 5. Ra8 Ree8 6. Ra6 Rb8 7. Rbb6 Rxb7 8. Rxc6+ Kd7 9. Rab6 Rxb6 10. Rxb6 Rxh2 11. Rb7+ Kc6 12. Rxg7 { With a likely draw. } ) 1... Kxa7 2. b8=Q+ ( { White misses the point with... } 2. Ra2+ Kb8 3. Ra8+ Kc7 4. b8=Q+ Rxb8 5. Ra7+ Kd6 6. c5+ Kxc5 7. Ra5+ Rb5 8. Rbxb5+ cxb5 9. Rxb5+ Kxb5 { Black wins with a large material advantage. } ) 2... Rxb8 3. Ra2+ Qa5 4. Rxa5# 1-0