Bobby Fisher - 1 vs 50
Bobby Fischer is considered by many to be the greatest chess player who ever lived. In this particular simultaneous exhibition, he won 47 of the matches, drew 2, and lost 1.
He lost to Donn Rogosin, not a well-known player. Fischer was 21 in this picture.
He is playing white, that’s a big advantage in high-level chess. You can choose an opening that you know well and your opponent doesn’t know well.
Basically, you get to decide which direction the game’s going to go for the first few turns. Openings are by the book so to speak, but there are variations and choices you can make.