groups of 20. Single round-robin with random home and away matches. Top 10 of each group qualified, plus remaining top 2 overall (to compensate possible group strength imbalance), plus... remaining top 2 public attendance. Thus Fluminense and Nacional advanced despite 32nd and 34th placings. This odd feature would never be reapplied. 2nd phase: 4 groups of 6 teams. Single round-robin with random away and home matches. Top team only of each group would qualify. Final phase: "Quadrangular". Single round-robin. Home and away matches criteria unclear. 1975 Copa Brasil – Single division w/ 46 participants The 1975 tournament introduced the feature of repechage, which eventually would be largely practiced in the following decades in "creative" ways, and eventually allowing ground for disputes that disrupted the championship as in the late 80's. 1st phase: 4 groups, with 2 paired groups of 10 teams and 2 paired of 11 teams. The system was what could be called "complementary round-robin" as teams of one group only played against the teams of the other group paired to it, with no internal round-robin. Top 5 teams of each group qualified for main groups while remaining teams qualified for repechage groups. Group distributions were random. An odd scheduling sometimes reproduced later on for unknown reasons, except urge for randomness. 2nd phase: 2 main groups of 10 teams and 4 repechage groups (2 of 5 and 2 of 6 teams). Main groups would reuse "complementary round-robin" system. Repechage groups single round-robin. Both random home and away matches. Top 6 teams of main groups and top team of repechage groups would qualify. 3rd phase: 2 groups of 8 teams. This time, standard single round-robin system (probably because of play-off needs). Top 2 would qualify. Final phase: single play-off semi-finals and final. Home advantage on 3rd phase group placing (crossed winner vs runner-up). Ranking issues: Final placings for top 16 teams based only on third phase placings, irrespective of first and second phase, given the inconsistency of those phases and differences between main and repechage groups. Also the third phase was large enough to provide a significant placing. Thus Flamengo and América-RJ are given both 5th place, for instance, instead of 7th and 8th according to CBF. Teams re-qualified from repechage are thus placed ahead of eliminated main group teams. Placing of eliminated main and repechage group teams consider 1st phase results as there was no elimination in the latter.