The confusion over Lionel Messi's contract clause, explained

What will it take for Lionel Messi to leave Barcelona? It's hard to argue that this day has been coming, though the events of the past two weeks have taken a precarious situation and transformed it into a virtually irreconcilable one. The 8-2 defeat to Bayern Munich, coupled with the arrival of Ronald Koeman and swift appraisal of team-mate Luis Suarez, who was deemed surplus to...