# HG changeset patch
# User Henry S. Thompson <ht@inf.ed.ac.uk>
# Date 1585164098 0
# Node ID 6c9e371b0325a499de7588164300e8cfde9fd901
# Parent  a7a10e40b344844ef64829d84b9f5856e217c88b
doesn't break, what's there is good, but stuck part-way in 10a

diff -r a7a10e40b344 -r 6c9e371b0325 nono.py
--- a/nono.py	Tue Mar 24 18:57:33 2020 +0000
+++ b/nono.py	Wed Mar 25 19:21:38 2020 +0000
@@ -78,6 +78,8 @@
     wins=0
     changed=0
     for k,runs in enumerate(self.allRuns):
+      if (self.m.loop,self.cLet,pos,k)==(1,'R',7,5):
+        print(self.m)
       dprint('=====pass %s.%s.%s.%s======'%(self.m.loop,self.cLet,pos,k))
       if self.onepass(self.margin0,self.marginN+1,scratch,runs.copy()):
         wins+=1
@@ -293,9 +295,16 @@
           return False
     if g>0:
       # Block a too-small gap
-      dprint('m2',i-g,i)
-      for j in range(i+1-g,i+1):
-        self.newX(j,True)
+      if rng.step==1:
+        # forward
+        dprint('m2f',i-g,i)
+        for j in range(i+1-g,i+1):
+          self.newX(j,True)
+      else:
+        # backward
+        dprint('m2b',i+g,i)
+        for j in range(i+g-1,i-1,-1):
+          self.newX(j,True)
     return True
 
   def found0(self,i):