been often used to accommodate calendar constraints as double round-robin systems would require too many rounds. The home and away matches are distributed randomly. In 1971, the split round-robin only served to qualify the top 6 teams of each group. This odd system allowed for a team to be eliminated by having a better full season record by falling in a stronger group. In this edition though, it did not occur, and the best overall 12 teams advanced. 2nd phase: 3 groups of 4 teams. Double round-robin system. Top teams of each group qualify Final phase: "Triangular", i.e. 1 group of 3 teams . Single round-robin. Random home and away matches. 1972 Campeonato Nacional de Clubes – Single division w/ 26 participants 1st phase: 4 groups, 2 of 6 teams and 2 of 7 teams, split round-robin similar to 1971 but with 4 groups instead of 2. The 4 top teams of each group qualified. As expectable already in 1971, it did occur this time that Santa Cruz qualified with 23 points in group C while Remo in group C did not make through with 25 points, despite playing exactly the same opponents. 2nd phase: 4 groups of 4 teams (top 2 against bottom 2 of previous phase), single round-robin with home and away matches based on first phase placing (though still top teams would play bottom teams away in second round). Top team only qualified. Final phase: Single play-off semifinals and final. Home advantage according to combined first and second phase placings. 1973 Campeonato Nacional de Clubes – Single division w/ 40 participants 1st phase: two stages, 1st) 2 groups of 20 teams in single round-robin, teams distributed in each group randomly; and 2nd) 4 groups of 10 teams in single round-robin distributed according to region/state. Combined first and second stage top 20 teams qualified. Arguably this system favored teams from weaker regions (mainly north-east) as they would be able to play between themselves. As such, Fluminense was eliminated while Tiradentes proceeded despite placing behind Fluminense in the same group of first stage. 2nd phase: 2 groups of 10, single round-robin with random home and away matches. Top 2 teams qualified. Final phase: "Quadrangular", i.e. 1 group of 4 in single round robin. Home and away matches order based on combined first and second phases. 1974 Campeonato Nacional de Clubes – Single division w/ 40 participants. 1st phase: 2