I just used the coordiantes of the grid to check all possible winning combinations.

notes.md

@@ -2,7 +2,7 @@
 
 ## Checkpoint 1 Notes
 
-play_ttt.py is the class responsible for each of the beahviors
+game.py is the class responsible for each of the beahviors
 
 Which class is responsible for each of the following behaviors?
 For each, explain how the behavior is accomplished.
@@ -18,6 +18,8 @@ For each, explain how the behavior is accomplished.
 
 ## Checkpoint 2 Notes
 
+I have no clue where im supposed to start but trial and error.
+
 ### TTT Strategy
 
 For each of the following board states, if you are playing as X

play_ttt.py

@@ -3,7 +3,8 @@ from ttt.view import TTTView
 from ttt.player import TTTHumanPlayer, TTTComputerPlayer
 
 player0 = TTTHumanPlayer("Player 1")
-player1 = TTTHumanPlayer("Player 2")
+# Play against the computer: make player1 a computer-controlled player.
+player1 = TTTComputerPlayer("Computer")
 game = TTTGame()
 view = TTTView(player0, player1)
 

ttt/game.py

@@ -58,4 +58,14 @@ class TTTGame:
 
     def check_winner(self, state, symbol):
         "Checks whether the player with `symbol` has won the game."
+        board = state["board"]
+        # All winning triplets (rows, columns, diagonals)
+        winning_combinations = [
+            (0, 1, 2), (3, 4, 5), (6, 7, 8),  # rows
+            (0, 3, 6), (1, 4, 7), (2, 5, 8),  # columns
+            (0, 4, 8), (2, 4, 6),             # diagonals
+        ]
+        for i, j, k in winning_combinations:
+            if board[i] == board[j] == board[k] == symbol:
+                return True
         return False