# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1443974820 -7200
# Node ID 0634014ddde59f6867527f85e68c1d37624277e6
# Parent  492a8c306ec50f44d7e344b6b607bac63b800b3a
Permit a broader exchange of colours.

diff -r 492a8c306ec5 -r 0634014ddde5 optimiser.py
--- a/optimiser.py	Sun Oct 04 17:51:40 2015 +0200
+++ b/optimiser.py	Sun Oct 04 18:07:00 2015 +0200
@@ -189,8 +189,12 @@
         least = [value for n, value in c[4:]]
 
         if least:
-            i = randrange(4, len(c))
-            c = c[:3] + c[i:i+1] + c[3:i] + c[i+1:]
+            switched = []
+            for j in 1, 2:
+                i = randrange(2, len(c))
+                switched.append(c[i])
+                del c[i]
+            c += switched
             most = [value for n, value in c[:4]]
             least = [value for n, value in c[4:]]