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by yesenadam 2498 days ago
It's a very old trick I'm sure. As for it never happening or fooling anyone in real life: the magician/mentalist Derren Brown challenged 9 English chess players, including 4 GMs, to a simul on his TV show, and got a plus score - he secretly had 8 of the players playing each other, with whom he thus had an even score. The 9th was president of a university chess club, and a very weak player, who Derren played and beat, winning the match.

https://www.youtube.com/watch?v=rIAXIubSTkc