a particular decision point is particularly subgame. You don't solve to the end of that subgame. Right? You do what's called depth limited reasoning. So, the remainder of the game is too large, so you come up with a strategy for the next several actions. Then, once you get to a certain depth limit, you say,okay, I've looked far enough, I'm just going to substitute a value for this leaf node, and say the value of this arrangement of pieces on the board looks like player one, white wins with 60 percent probability.