diff --git a/notes.md b/notes.md
index 02f68b3..d60fba1 100644
--- a/notes.md
+++ b/notes.md
@@ -30,6 +30,7 @@ and it's your turn, which action would you take? Why?
 ---+---+---   ---+---+---   ---+---+---   ---+---+---
    |   |         |   | O       |   |         |   |   
 
+
 ### Initial game state
 
 You can get the inital game state using game.get_initial_state(). 
diff --git a/ttt/game.py b/ttt/game.py
index 2f0e302..f99f3c1 100644
--- a/ttt/game.py
+++ b/ttt/game.py
@@ -58,4 +58,25 @@ class TTTGame:
 
     def check_winner(self, state, symbol):
         "Checks whether the player with `symbol` has won the game."
+        combos = [
+            [0, 1 ,2],
+            [3, 4, 5],
+            [6, 7, 8],
+            [0, 3, 6],
+            [1, 4 ,7],
+            [2, 5 ,8],
+            [0, 4 ,8],
+            [2, 4 ,6]
+        ]
+        for combo in combos:
+            if self.check_winning_combo(state,symbol,combo):
+                return True
         return False
+
+    def check_winning_combo(self, state, symbol, combo):
+        """Checks whether all three spaces in a combo eg[1,2,3] are 
+        filled with a symbol"""
+        for index in combo:
+            if state["board"][index] != symbol:
+                return False
+        return True
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