Game full of mistakes but interesting to see that black can sac the exchange here and is slightly better according to Lichess Stockfish. (2/0/3, 49 acpl)
See also my blog post about Nievergelt and Fischer :
https://lichess.org/@/achja/blog/when-bobby-fischer-learned-from-erwin-nievergelt/jAM7StEM
https://lichess.org/N1NshJMs/black#33
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