choose this best response that we just calculated, which was always play rock. They make this decision because all of these states, sharing information set, they can't say, "Okay, well, in this state, I'm going to choose this policy, and this state I'm going choose this policy." They have to make the same decision at each of these different states that share an information set. So, we solve this depth-limited subgame again. Then, we again calculate a player two best response to that strategy, and then we add that strategy to the set of