diff --git a/notes.md b/notes.md
index e278c19..72b3a73 100644
--- a/notes.md
+++ b/notes.md
@@ -16,7 +16,11 @@ The player class contains the choose_action method which allows the player
 to choose whicn place to play.
 
 ## Checkpoint 2 Notes
-
+I was able to get the game to correctly determine who the winner was. I understand that there's
+an array that I'm accessing, and that indexes 0 through 9 correspond to the different spaces on the
+board starting on the top left and going across the row, then down to the left of the next row, etc.
+What I do not understand is what state is and why we need to use state["board"][index] to access 
+something on the boare
 ### TTT Strategy
 
 For each of the following board states, if you are playing as X
diff --git a/ttt/game.py b/ttt/game.py
index 2f0e302..1db20cd 100644
--- a/ttt/game.py
+++ b/ttt/game.py
@@ -58,4 +58,23 @@ class TTTGame:
 
     def check_winner(self, state, symbol):
         "Checks whether the player with `symbol` has won the game."
-        return False
+        if state["board"][0]==symbol and state["board"][1]==symbol and state["board"][2]==symbol:
+            return True
+        elif state["board"][3]==symbol and state["board"][4]==symbol and state["board"][5]==symbol:
+            return True
+        elif state["board"][6]==symbol and state["board"][7]==symbol and state["board"][8]==symbol:
+            return True
+        elif state["board"][0]==symbol and state["board"][3]==symbol and state["board"][6]==symbol:
+            return True
+        elif state["board"][1]==symbol and state["board"][4]==symbol and state["board"][7]==symbol:
+            return True
+        elif state["board"][2]==symbol and state["board"][5]==symbol and state["board"][8]==symbol:
+            return True
+        elif state["board"][0]==symbol and state["board"][4]==symbol and state["board"][8]==symbol:
+            return True
+        elif state["board"][2]==symbol and state["board"][4]==symbol and state["board"][6]==symbol:
+            return True
+        else:
+            return False
+
+