Fifth, all nodes in a given information set have the same immediate successors; oth- erwise, the player who is called on to move on that information set would be able to infer in which node he is located by just looking at the number of immediate succes- sors he faces and their labels. Figure 8.6 depicts a game tree violating this property. In this case player 2 would know whether he is located in the top node of the information set (if only actions A and B are available to him) or in the bottom node (if A, B, and C are available).