diff -r 8b132f8de8c7 -r fd3f8581ce85 progs/knight1_sol.scala
--- a/progs/knight1_sol.scala	Sat Dec 03 13:49:11 2016 +0000
+++ b/progs/knight1_sol.scala	Thu Dec 08 12:50:54 2016 +0000
@@ -33,6 +33,10 @@
 assert(legal_moves(8, List((4,1), (1,0)), (2,2)) == 
   List((3,4), (4,3), (3,0), (0,1), (0,3), (1,4)))
 assert(legal_moves(8, List((6,6)), (7,7)) == List((6,5), (5,6)))
+assert(legal_moves(1, Nil, (0,0)) == List())
+assert(legal_moves(2, Nil, (0,0)) == List())
+assert(legal_moves(3, Nil, (0,0)) == List((1,2), (2,1)))
+
 
 def count_tours(dim: Int, path: Path): Int = {
   if (path.length == dim * dim) 1