path: root/grudger.pl

% Cooperates until the second has defected, after
% that move defects forever (he does not forgive).
% http://euler.fd.cvut.cz/predmety/game_theory/lecture_repeat.pdf

grudger([], c) :- !.
grudger([c|Tail], c) :- grudger(Tail, c),!.
grudger(_, d).