But it turns out that in poker, it ends up being way harder which is where it gets you right now. So in perfect-information games, you take some action, your opponent takes some action, you find yourself in a particularly subgame. Now, you can forget about everything that came before, all the other situations you did not encountered. The only thing that matters is the situation that you're in, and the situations that can be reached from this point on. So in perfect-information games, so for example, if I were to show you this chess board,