CHSH inequality

Chsh inequality is a math problem that looks at how likely it is for two people to get the same answer when asked the same question. It's a bit like a game of rock-paper-scissors: each player can choose from two different answers, rock or paper. If both players choose the same answer, the game is a tie. The Chsh inequality looks at how often it happens that the players tie. It's harder than rock-paper-scissors because it looks at more than just two choices. To win at Chsh inequality, the players have to be very close to each other in guessing the same answer.