NPC / Mitre 10 Cup
It is the main domestic competition in New Zealand. It is played by provincial union selections.
Until 2005 it was played by all the provincial unions divided into 3 divisions.
With the 2006 revamping of the competition, only the 14 best unions were choosen to play the new cup, while the other 12 were passed to Heartland Championship.
It is now played on 2 divisions (Premiership and Championshp) with 1 relegation and 1 promotion between them each year.
www.mitre10cup.co.nz - Mitre 10 Cup official site.
www.rugbyhistory.co.nz - Site about New Zealand rugby history.
en.wikipedia.org/wiki/Rugby_union_in_New_Zealand - Wikipedia pages about rugby in New Zealand.
Every site was scanned using also web.archive.org