share the title. This happened several times, including in 1939 when a record 3 clubs had to share the title. To remedy this, a play-off system leading to a grand final was instaured in 1998. This new system has been in use since then, except in 2001. In 1998, the URBA introduced the playoff system, with a final match in a neutral venue to determine a unique champion of the season. New changes to the rules were added in 2008, when the fourteen best placed teams at the end of the regular season were eligible to play a second stage, named "Top 14". Every club played each other only once in a single-robin championship (either home or away). At the end of this phase, the first 4 clubs qualified for the semi-finals of the tournament, with the first ranked team meeting the fourth and the second meeting the third. Both semi-finals took place on the same weekend on neutral ground (usually the Club Atlético San Isidro stadium). The winner was crowned URBA champion. This system has remained (with minor changes) since then. The rest of the clubs played in a promotion and relegation competition named "Torneo Reubicación". Both the URBA winner and runner-up qualified for the Nacional de Clubes semi-finals, where they met the winner and runner-up of Torneo del Interior. The winner of that competition was declared Argentine champion. In 2016, the URBA introduced changes in the tournament's format for the 2017 season, with the "Top 14" being reduced to 12 teams (therefore renamed "Top 12") and becoming an independent championship, with all of the teams playing each other in a double round-robin tournament (home and away games). As a result of those changes, the Buenos Aires league system was divided into six tiers. The new format also stated that the four best placed teams at the end of the season, would play the semifinals while the two worst placed would be relegated to the second division. Format The tournament will start on March 25, 2023, with the 12 participant teams playing a double round-robin tournament, which will end on October 15. The four best placed clubs will qualify to the semifinals (played as single matches in neutral venues) on October 29 and 30. Winners will play the final (also a single match) at Club Atlético San Isidro stadium, frecquent venue for URBA finals, on November 5, 2022. The