Swiss Promotion League

The Promotion League is the third tier of the Swiss football league system. Sixteen clubs compete in the league, playing each other twice over the course of the season. The champions are promoted to the second tier, the Challenge League, while the bottom two teams are relegated to the 1. Liga.
The league is suspended until 2021 due to the ongoing COVID-19 pandemic.
Overview.
Sixteen teams play each other twice, once home and once away, for a total of 30 games. The season begins in August and ends in May, interrupted through a winter break from late November to early March. The team finishing in first place—subject to license requirements of professional football—will be promoted to the division above, in turn the last-placed team of the second division will be relegated for the following season. Similarly, the bottom two teams are relegated to the fourth tier and replaced respectively.
It is the highest league in Switzerland that permits participation of reserve teams.
History.
The league was introduced as the "1. Liga Promotion" beginning with the 2012–13 season as part of a restructuring that saw the Challenge League reduced from 16 to 10 teams. This was done to decrease the competitive gap between it and the Super League by converting it to a purely professional league. The Promotion League would therefore serve as the semi-professional link to amateur football. The 1. Liga was consequently renamed to "1. Liga Classic", before reverting again in 2013 when the former adopted its current name. For its maiden season, six teams were relegated from the Challenge League, while the rest joined from the division below. In March 2020, the ongoing season was canceled after 17 games due to the COVID-19 pandemic and the 2020–21 season suspended until further notice.
League champions.
The following teams have won the league: