part of the play subgame and in fact, it's not even on the path leading to the play subgame. So, this is something that happens in imperfect information games. It does not happen in perfect information games. In perfect information games, if you wanted to determine the optimal strategy in subgame, you only need to look at that subgame by itself. But in imperfect information games, you have to look at the game as a whole. So, you can think of like perfect information games is a special case where you don't have to worry about all this stuff.