1 files changed, 3 insertions, 3 deletions
diff --git a/grudger.pl b/grudger.pl
index 3a78513..b075a42 100644
--- a/grudger.pl
+++ b/grudger.pl
@@ -2,6 +2,6 @@
 % that move defects forever (he does not forgive).
 % http://euler.fd.cvut.cz/predmety/game_theory/lecture_repeat.pdf
 
-grudger([], c).
-grudger([d|_], d).
-grudger([c|Tail], Decision, _, _) :- grudger(Tail, Decision).
+grudger([], c, _, _).
+grudger([d|_], d, _, _).
+grudger([c|Tail], Decision, _, _) :- grudger(Tail, Decision, _, _).