diff --git a/ttt/game.py b/ttt/game.py
index 2f0e302..0d7149a 100644
--- a/ttt/game.py
+++ b/ttt/game.py
@@ -58,4 +58,9 @@ class TTTGame:
 
     def check_winner(self, state, symbol):
         "Checks whether the player with `symbol` has won the game."
+        winning_combinations=[[0,1,2],[3,4,5],[6,7,8],[0,3,6],[1,4,7],[2,5,8],[0,4,8],[2,4,6]]
+        board=state["board"]
+        combination=[index for index in range(9) if board[index]==symbol]
+        if combination in winning_combinations:
+            return True
         return False