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  • The game over states are the only states that give you a score in tic tac toe: win, lose, or draw. Back propogating that information is important. Commented Dec 10, 2016 at 14:39
  • @CandiedOrange I understand that but I was wondering whether there was a difference between reaching a terminal state through random playout (not reflected in the game tree) vs through expansion of the tree. Commented Dec 10, 2016 at 17:00