two clubs from Copenhagen. Before the 1927–28 season, the first nationwide tournament, the "Denmark Tournament", was inaugurated. 20 teams were divided into five groups of four teams. They played each other once, and the five group winners qualified for a championship deciding group. Here they again played each other once, and the top placed team was declared champions after seven games in all. This lasted only two years before the league system was changed and the tournament renamed to the "Championship League" for the 1929–30 season. The teams were divided into two leagues, a championship series of ten teams and a promotion series with a varying number of clubs each year. This meant that the number of teams competing for the championship was fixed for the course of the tournament, and that every team played each other. The lowest placed team in the championship series and the top placed team in the promotion series would swap places between each season. From the start of the competition in 1929–30, the clubs played each other once to give a total of nine games a season, but from 1936 to 1937 they met twice in a season for a total of 18 games. During the German occupation of Denmark in World War II from 1940 to 1945, the championship was again decided in a single final. The format varied throughout the occupation, as a differing number of teams played in three separate tournaments. The best placed teams in each tournament would go on to a string of play-off games, before two teams met in the final. From the 1945–46 season, the competition reverted to the "Championship League" format, with the tournament now named the "1st Division". There were 10 teams in the top division once again, playing each other twice, with the lowest team being relegated. The 1953–54 season saw the first non-Copenhagen team win the Danish championship, when Køge Boldklub won the title. The championship title was not reclaimed by a Copenhagen team in more than ten years, until Akademisk Boldklub (AB) won the 1967 season. From 1958, the Danish championship was arranged through one calendar year, and the 1956–57 season lasted 18 months with the teams playing each other thrice for a 27 games total. From 1958 to 1974, the tournament was expanded to 12 teams, playing each other twice for 22 games per season each, but now the bottom two