diff --git a/buggy.py b/buggy.py
--- a/buggy.py
+++ b/buggy.py
@@ -13,7 +13,7 @@
         bingo = True
     vertical = True
     for n in range(N):
-        if boolss[i][n] == False:
+        if boolss[n][j] == False:
             vertical = False
             break
     if vertical:
