The old riddle of Botvinnik vs Fischer

Let us remind you: In 1958 the 15-year-old US champion Bobby Fischer had refused to play in the Munich Olympiad, because his demand for board one ahead of Samuel Reshevsky was rejected. After that Fischer represented the United States on first board at four Men's Chess Olympiads. In Varna, Bulgaria, he outplayed world champion Mikhail Botvinnik, and in a winning position blundered it to a draw. He left the hall with tears in his eyes. Can you help GM Karsten Müller to find the win that Fischer missed?

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Historical ridde: Botvinnik vs. Pachman