Add assessment

assessment.md

@@ -0,0 +1,33 @@
+# Tic Tac Toe Lab Assessment
+
+## Checkpoint 1
+Looks good. 
+
+## Checkpoint 2
+> What I do not understand is what state is and why we need to use 
+> state["board"][index] to access something on the board
+
+I think you asked a similar question in Discord, so maybe you already have an 
+understanding, but state is just a dict storing what's on the board and whose
+turn it is. State isn't related to syntax--python doesn't care about state at all.
+Instead, state is a design feature of this program. We intentionally design the 
+TTTGame so that it encodes the rules of the game, but doesn't know anything about
+the particular game(s) which are actually being played. That's stored within state. 
+
+The benefit of organizing a program this way is that we can then reason about 
+multiple future states of the game, for example in the lookahead strategy introduced
+later in the lab. We can draw an expanding chain of states out into the future, 
+and think about which futures are best. To see t
+
+## Checkpoint 3
+Actually, the current and future reward (they're added together) is 0. 
+This means that if both players play perfectly, the game will end in a draw every time.
+You could see this using:
+
+```
+>>> from ttt.game import TTTGame
+>>> from strategy.lookahead_strategy import LookaheadStrategy
+>>> g = TTTGame()
+>>> s = LookaheadStrategy(g)
+>>> s.get_current_and_future_reward(g.get_initial_state())
+```