In his book: "How To Be a Winner at Chess" on page 17 Reinfeld writes: "I once saw Reuben Fine, one of the world's strongest players, resign in a very important match game because he thought that checkmate was unavoidable. He was wrong! As soon as the game was over he was shown a perfectly adequate defense that would have saved his position from defeat."
I wonder what game that was? I'd love to see it.