It is a Welsh rugby rule which has caused almost as much controversy as the never-ending debate in grammar circles over the Oxford comma, about which it is said there will never, ever be complete agreement.
Some have been against Wales' 60-cap regulation from the start, contending that players should be free to play their club rugby where they want. Others support it wholeheartedly.
Plenty argue about why it was brought in and who benefits the most.
