The Pacific Nations Cup is an international rugby union competition held between three Pacific states: Fiji, Samoa and Tonga. The 2019 edition of the tournament will also include the national teams of Canada, Japan and United States. First held in 2006, the tournament is intended to strengthen the Tier 2 rugby teams by providing competitive test matches in a tournament format. Previously, Japan participated from 2006 to 2015, New Zealand from 2006 to 2009, Australia from 2007 to 2008, and Canada and the United States from 2013 to 2015. The inaugural tournament was the only one that carried the title of IRB Pacific 5 Nations; from 2007 the competition was known as the IRB Pacific Nations Cup. Format The tournament is a round-robin, where each team plays one match against each of the other teams. There are four points for a win, two points for a draw and none for a defeat. There are also bonus points offered with one bonus point for scoring four or more tries in a match and one bonus point for losing by 7 points or fewer. The tournament generally occurs every year in the June mid-year international test window. The tournament was played mainly throughout June, with the last round in early July. The revised tournament begins in May due to pre-existing Test commitments and concludes in late June. History The Pacific Nations Cup was funded as an International Rugby Board (IRB) tournament which was part of the $US50 million, three-year, global strategic investment programme launched in August 2005. The competition was aimed at developing the Pacific rim sides in the second tier of the rugby countries: Fiji, Japan, Samoa and Tonga. The Junior All Blacks were also invited to compete, who are New Zealand's second XV. "The IRB Pacific 5 Nations is a tournament that will provide more certainty for Fiji, Japan, Samoa and Tonga in terms of regular high level Test match rugby, while also providing a high level of competition for the Junior All Blacks," said Mark Egan, the IRB's Head of Rugby Services. In the first year only it was called the IRB Pacific 5 Nations and did not include Australia. Australia had been invited to take part in the inaugural 2006 tournament but decided against sending a team stating that they wanted to focus on their domestic competition. The inaugural tournament kicked off 3 June 2006 and was played