The duration of certain championship matches increased from 60 to 80 minutes during the 1970s. They were settled at 70 minutes after five seasons of this in 1975. This applied only to the provincial finals, All-Ireland semi-finals and finals. The first half of the twentieth century brought the rise of several teams who won two or more All-Ireland titles in that period, such as Kildare, Mayo, Cavan, Wexford and Roscommon. In the 1990s, a significant sea change took place, as the All-Ireland was claimed by an Ulster team in four consecutive years (1991–1994). Since then Ulster has produced more All-Ireland winning teams than any other province. The All-Ireland Qualifiers were introduced in 2001. Later that year, the 2001 final brought victory for Galway who became the first football team to win an All-Ireland by springing through "the back door." In 2013, Hawk-Eye was introduced for Championship matches at Croke Park. It was first used to confirm that Offaly substitute Peter Cunningham's attempted point had gone wide 10 minutes into the second half of a game against Kildare. 2013 also brought the first Friday night game in the history of the Championship – a first round qualifier between Carlow and Laois. In recent years further changes have been made to the structure of the championship. In 2018 the Super 8s were introduced, where the four provincial champions and the four-round 4 qualifier winners would be split into two groups of four teams. Each team plays their group rivals once, with the top two teams progressing to the All-Ireland Semi-Finals. In 2022 a two-tier format will be adopted for the championship. Division 3 and 4 teams from the National Football League that fail to reach a provincial final will not proceed to the All-Ireland qualifiers and will instead play in the Tailitean Cup. Teams Current championship pyramid Teams in the top two levels are separated via the provincial championships and the national football league. Teams from tier 3 may reach tiers 1 and 2 through promotion. Format The county is a geographical region in Ireland, and each of the thirty-two counties in Ireland organise their own Gaelic games affairs through a County Board. The county teams play in their respective Provincial Championships (reflective of the four Irish provinces) in Connacht (which also includes teams from London and New York), Leinster, Munster, and Ulster. Kilkenny is currently unique among the 32 Irish county