Relegation and promotion

Currently, the two teams with the worst scores in the season, are relegated to Primera B, and replaced by the champions and the playoff winners of this division.

Qualification for international competitions

The league champions qualify for the following year's Copa Libertadores, as well as the runners-up and the third-placed team. The teams placing fourth, fifth, sixth and seventh qualify for the following year's Copa Sudamericana.

Professionalism

In 1933, eight big clubs at that time, namely, Unión Española, Badminton, Colo-Colo, Audax Italiano, Green Cross, Morning Star, Magallanes and Santiago National F.C., founded the Liga Profesional de Football de Santiago (LPF) on May 31, 1933. The newly formed body was recognized by the Football Federation of Chile on June 2, 1933. ^{[citation needed]}

The first edition of professional competition was contested by the eight founding teams and was won by Magallanes after defeating Colo-Colo in a decisive match. In the following year, according to the disposition of Federación de Fútbol de Chile, Liga Profesional returned to integrate with the AFS. As part of the negotiations for reunification, four teams from AFS, namely, Club Deportivo Ferroviarios, Carlos Walker, Deportivo Alemán, and Santiago F.C., would join the 1934 professional competition. Moreover, it was also decided that the last six teams in the 1934 competition would be eliminated to form the new second division in 1935. The title of the expanded 1934 edition was again clinched by Magallanes, which won 10 out of the 11 matches that year.^[4]