diff -r d306102fd33b -r 61d9a5ac6430 templates2/knight3.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/templates2/knight3.scala	Tue Nov 14 22:19:04 2017 +0000
@@ -0,0 +1,33 @@
+// Part 3 about finding a single tour using the Warnsdorf Rule
+//=============================================================
+
+// copy any function you need from files knight1.scala and
+// knight2.scala
+
+object CW7c {
+
+type Pos = (Int, Int)    // a position on a chessboard 
+type Path = List[Pos]    // a path...a list of positions
+
+//(3a) Complete the function that calculates a list of onward
+//     moves like in (1b) but orders them according to Warnsdorf’s 
+//     rule. That means moves with the fewest legal onward moves 
+//     should come first.
+
+//def ordered_moves(dim: Int, path: Path, x: Pos) : List[Pos] = ..
+
+
+//(3b) Complete the function that searches for a single *closed* 
+//     tour using the ordered moves function.
+
+//def first_closed_tour_heuristic(dim: Int, path: Path) : Option[Path] = ...
+
+
+//(3c) Same as (3b) but searches for *non-closed* tours. However, 
+//     you have to be careful to write a tail-recursive version as this 
+//     function will be called with dimensions of up to 40 * 40.
+
+//def first_tour_heuristic(dim: Int, path: Path) : Option[Path] = ...
+
+
+}