--- a/cws/main_cw04.tex	Sun Nov 08 03:08:31 2020 +0000
+++ b/cws/main_cw04.tex	Sun Nov 08 13:09:38 2020 +0000
@@ -29,7 +29,9 @@
 This part is about searching and backtracking. You are asked to
 implement Scala programs that solve various versions of the
 \textit{Knight's Tour Problem} on a chessboard. The preliminary part (4\%) is
-due on  \cwNINE{} at 5pm; the core part (6\%) is due on \cwNINEa{} at 5pm.\bigskip
+due on  \cwNINE{} at 5pm; the core part (6\%) is due on \cwNINEa{} at 5pm.
+Any 1\% you achieve in the preliminary part counts as your ``weekly engagement''.
+\bigskip 
 %Note the core, more advanced, part might include material you have not
 %yet seen in the first three lectures. \bigskip