diff --git a/game.py b/game.py
index 96cbf2d25..7b58ca238 100644
--- a/game.py
+++ b/game.py
@@ -90,7 +90,7 @@ def has_a_winner(self):
         n = self.n_in_row
 
         moved = list(set(range(width * height)) - set(self.availables))
-        if len(moved) < self.n_in_row + 2:
+        if len(moved) < self.n_in_row *2-1:
             return False, -1
 
         for m in moved: