The Tri Nations was an annual competition involving New Zealand, Australia, and South Africa. Previously this involved each country playing one home and one away game against both other countries. From 2006 the competition was expanded with each nation playing both the other nations three times (except in Rugby World Cup years). Since 's strong performances in the 2007 World Cup a number of commentators believed they should join the Tri-Nations. This was firstly proposed for the 2008 tournament, then for 2010, but eventually this prospect came much closer to reality after the 2009 Tri Nations tournament, when SANZAR (South Africa, New Zealand and Australian Rugby) extended an official invitation to the Unión Argentina de Rugby (UAR), to join a new revised Four Nations tournament in 2012. This long-anticipated move was generally met with great approval from all parties involved. The invitation was however subject to certain conditions, like the guaranteed availability of the top Puma players, most of whom play highly paid professional club rugby in Europe at present.