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 "Unknown44"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "1k6/1P5p/2Pp1bp1/B2Pp3/n1B2p2/p2K1P2/6PP/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Nb2+ 2. Kc3 e4+ { An intermediate move. } 3. Kb3 Nxc4 4. Kxc4 a2 5. Bb4 Be5 6. fxe4 a1=Q { Black wins with a large material advantage. } 0-1