diff -r ab77f6006f1f -r 48a477fdef21 progs/knight.scala
--- a/progs/knight.scala	Sat Nov 05 17:11:47 2016 +0000
+++ b/progs/knight.scala	Sat Nov 05 18:07:21 2016 +0000
@@ -43,7 +43,7 @@
   if (steps.length ==  n * n && moves(n)(steps.head).contains(steps.last))
     print_board(n)(steps)
   else 
-    for (x <- moves(n)(steps.head).par; if (!steps.contains(x))) ctour(n)(x :: steps)
+    for (x <- moves(n)(steps.head); if (!steps.contains(x))) ctour(n)(x :: steps)
 }
 
 
@@ -51,7 +51,7 @@
   if (steps.length ==  n * n && moves(n)(steps.head).contains(steps.last))
     print_board(n)(steps)
   else 
-    for (x <- ordered_moves(n)(steps)(steps.head).par; if (!steps.contains(x))) faster_tour(n)(x :: steps)
+    for (x <- ordered_moves(n)(steps)(steps.head); if (!steps.contains(x))) faster_tour(n)(x :: steps)
 }
 
 
@@ -65,7 +65,6 @@
 }
 
 
-/*
 val n2 = 6
 println(s"circle tour: n = $n2")
 
@@ -74,9 +73,9 @@
     ctour(n2)(List((i, j))) 
   }
 }
-*/
+
 
-val n3 = 9
+val n3 = 8
 println(s"fast circle tour: n = $n3")
 
 Try {