diff --git a/extra/gearing-up-for-destruction/solution.py b/extra/gearing-up-for-destruction/solution.py
index 65e0dd3..dfd9359 100644
--- a/extra/gearing-up-for-destruction/solution.py
+++ b/extra/gearing-up-for-destruction/solution.py
@@ -3,7 +3,7 @@ def solution(pegs):
 
     if len(pegs) % 2 == 0:
         s = 2 * odd - 2 * even - pegs[-1] + pegs[0]
-        if s <= 0:
+        if 2*s < 3:
             return [-1, -1]
         if s % 3 == 0:
             return [2*s/3, 1]
@@ -11,7 +11,7 @@ def solution(pegs):
             return [2*s, 3]
     else:
         s = 2 * odd - 2 * even + pegs[-1] + pegs[0]
-        if s <= 0:
+        if 2*s < 1:
             return [-1, -1]
         return [2*s, 1]
 
@@ -28,6 +28,8 @@ def sum_odd_even(pegs):
 tests = [
         ([4, 30, 50], [12, 1]),
         ([4, 17, 50], [-1, -1]),
+        ([1, 2], [-1, -1]),
+        ([1, 2, 3], [-1, -1]),
         ]
 
 for i, o in tests: