I drew an im when I was 13. Won a book, a short one on endgames by alekhine. This was at an exhibition, he was playing 50 boards. Back then if you wanted to know your rating you have to wait for a magazine to get published and then go buy one.
He was like step to the next board and ... make a move. Until he got to the reigning california master. He slowed down then!
I don't have the book anymore, but I can feel it. Oh, I screwed up early in the game, but figured he's distracted enough I might still have a chance