diff --git a/tic_tac_toe.py b/tic_tac_toe.py
index d55bfed..3a61695 100644
--- a/tic_tac_toe.py
+++ b/tic_tac_toe.py
@@ -3,10 +3,8 @@
 #a = {}
 
 def update_board(board, move, player):
-    if board[move] == 'X' or board[move] == 'O':
+    if move not in board or board[move] in ['X', 'O']:
         return False
-    #a[move] = move
-    board[move] = player
     return True
 
 def check_winner(board):