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 "Bad Lauterberg"]
[Date "1977.??.??"]
[Round "?"]
[White "Karpov"]
[Black "Csom"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "q3rn1k/2QR4/pp2pp2/8/P1P5/1P4N1/6n1/6K1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Nf5 exf5 ( { Black can try: } 1... Nxd7 2. Qh2+ Kg8 3. Qg3+ Kf8 4. Qg7# ) 2. Qh2+ Kg8 3. Qg3+ Kh8 4. Qg7# 1-0