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 "Kopylov"]
[Black "Karlson"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "3r2k1/1p4pp/2p5/pnP2b2/2K2N1P/P4P2/5BP1/7R b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Rd3 { Despite the fact that this is a simple mate in two problem, this
move is difficult to find. } 2. Nxd3 ( { White can try: } 2. g4 Nxa3# ( 2... Rc3# ) ) 2... Be6# 0-1