Federer and Nadal are playing tennis. Federer is about to serve. He can either serve left or right. The serve is so fast that Nadal needs to decide whether he moves left or right before he sees the direction of the serve. Federer is more likely to win the point if Nadal moves in the opposite direction to which he serves, and Nadal is more likely to win the point if he moves in the same direction as Federer serves. Both players rank outcomes based on their chances of winning the point. The gure below contains four different extensive form games. Which one could represent the situation we just described