OK, I found it. This was an idea that myself and another forumer (Kiwilinzi from back in the IRB Forum days) came up with. I have rewritten it a little since it was back in the days of the Tri-Nations and the IRB.
SUPER SEVEN and MINOR SEVEN: A Bi-annual International Premiership of Rugby
The idea of this competition is to formalise the current Autumn Internationals and the July Tours, and very importantly it would require no additional matches to be played. The National Unions involved would pay their own costs (since they already do now anyway for AIs and JTs). World Rugby may have to set up a Super Seven Rugby sub-organisation (Super Seven Rugby Ltd?) to arrange sponsorship and TV rights.
1. At the end of each 6N, the top seven ranked teams in the world (at that point) are identified and drawn to play each other once over the following 12 months.
2. The Super Seven is held every two years (not in a World Cup year and not in a Lions Tour year).
3. Each of the seven teams will play six matches (three home, three away).
4. Six Nations and Rugby Championship matches (if applicable) would also count as Super Seven matches. In the case of The Rugby Championship, the last of the two matches would count as the Super Seven match.
5. Table points would be awarded in the usual way; 4 points for a win, 2 for a draw 0 for a loss plus 1 bonus point for 4 tries and 1 bonus point for a close loss (7 or less).
6. There is no promotion/relegation as such. Instead, teams qualify for the Super Seven on their ranking points.
7. There would be no final. Top of the table wins the Super Seven Premiership.
8. Matches would count for 1.5X the world ranking points, so Unions who send weakened teams to the opposite hemisphere would stand to get hammered in the rankings, and risk dropping out of the competition the following year (not to mention potentially risking their seedings for the next RWC.
NOTES:
• If the AIs and STs were to be formalised in this way, their value would be hugely greater than they are now, being part of a recognised competition.
• The matches outside of 6N and RC would be played in the arranged international windows, so player availability should not be an issue, but in any case where it was, World Rugby would have to enforce Regulation 9.
• The profits made from this competition would be used to pay for a similar competition for the teams ranked 8 to 14 (the Minor Seven) where ranking points would also count 1.5x their normal value.
• The competition would not preclude matches between Super Seven teams and Minor Seven teams (or Minor Seven teams and those teams ranked below 14) but these matches would only count for normal ranking points if applicable.