Teams from different leagues play against each other in European competitions and exchange Elo points. This means that leagues exchange Elo points as well. However, when one observes the leagues' Elo differences over time, it becomes clear that leagues do not exchange enough Elo points just by the few European matches each year. The Elo values will then be very inert and it takes decades for formerly weak leagues to catch up with formerly strong leagues.
So these ranking will apply an additional measure: Every time a club exchanges Elo points with a club from another league, on top of the exchanged points from the clubs, the leagues will exchange points as well. A certain amount of points will be added to the league's clubs, uniformly distributed. To find out how many points are ideal, I tested what factor is required to provide the best predictability for European Cup games. The following table shows how many points are exchanged per team and per league in a European Cup game:
|Elo points factor: Team + League||NL||OP||1L||2L|
|Team's league not covered||2+0||2+0||2+0||2+0|
|Only national playoff matches covered||1½+½||1½+1½||1½+1½||1½+4½|
|One League from team's assossiation covered||1+1||1+2||1+5||1+5|
|Two Leagues from team's assossiation covered||1+1||1+5||1+5||1+11|