If you were playing the familiar game of rock paper scissors against a computer, probability dictates that you would do equally well by picking any one of the three options. Whether you pick paper, scissors or rock, your chance of winning is always one in three. But because people are far less random than computers when playing the game, you can devise a strategy that will give you a greater chance of winning when playing against a human.
This video by Numberphile breaks down the strategy. The findings are based on an awesome study of a massive rock-paper scissors tournament at China’s Zhejiang University, in which 360 students each played 300 rounds of the game.