In 1926, the system changed, with only one league of 14 clubs at the second-highest level now called Division I.
The regular season was a double round-robin tournament played between August and May, with an interruption of 3 weeks in the winter.
The play-offs were a double round-robin, with the winner earning a place in the first division.
If it did not have its license, it was replaced by the next highest team in the overall regular season ranking.
For the automatic promotion spot (as opposed to the play-offs) the team must have finished in the top three clubs.
As part of changes in the league system to be implemented in the 2016–17 season, the 2015–16 transitional season saw the champions promoted and 9 teams relegated to the third division, while no team was promoted from the third division.