diff --git a/buggy.py b/buggy.py
--- a/buggy.py
+++ b/buggy.py
@@ -13,7 +13,7 @@
 if (
     all(len(r) == 9 for r in row)
     and all(len(c) == 9 for c in col)
-    and all(len(b) == 9 for b in block)
+    and all(all(len(b) == 9 for b in br) for br in block)
 ):
     print("Yes")
 else:
