 Since Argentina's strong performances in the 2007 World Cup, after the 2009 Tri Nations tournament, SANZAR (South Africa, New Zealand and Australian Rugby) invited the Argentine Rugby Union (UAR) to join an expanded Four Nations tournament in 2012.The competition has been officially rechristened as The Rugby Championship beginning with the 2012 edition.The competition reverted to the Tri Nations' original home-and-away format, but now involving four teams.