association introduced a new format with two leagues at the top level and a final game in two legs. The format changed back to one league with nine clubs in 1900–01, then again to two leagues from 1901–02 to 1903–04, this time with a final round among the top two teams of each league. In 1904–05, the championship was organised with one league of 11 teams. Athletic and Running Club de Bruxelles withdrew during the season and, from the 1906 season on, a system of promotion and relegation was introduced with the winner of the second division replacing the last-placed team of the first division. In 1906–07, Union Saint-Gilloise won their fourth consecutive title as RC de Bruxelles had from 1899–1900 to 1902–03. Both clubs claimed the next three titles before CS Brugeois won their first title, finishing one point ahead their rival of FC Brugeois. At the end of the 1907–08 season, the number of teams in the first division was increased from 10 to 12 clubs, with Promotion champion RC de Gand and runner-up ESC Forest being promoted while no first division was relegated. As World War I approached, Daring Club de Bruxelles confirmed its status of challenger, even winning the title in 1911–12 and 1913–14. Only Union Saint-Gilloise could face them in that period, winning the 1912–13 championship with a better goal difference. Since 1911–12, two clubs are relegated each year to the Promotion and two clubs from the Promotion are promoted. After World War I (1919–1945) During World War I, the football championship was suspended. It resumed in 1919–20 with FC Brugeois claiming their first title after 5-second places, among which were 2 lost final games and one lost test-match. At the end of the 1920–21 season, the number of teams was increased from 12 to 14, with only Uccle Sport, the last-placed team of the first division, being relegated, and the first 3 teams from the Promotion being promoted (Standard Club Liégeois, FC Malinois, and RSC Anderlechtois). From 1921–22 to 1931–32, the decade was dominated by teams from the province of Antwerp: Beerschot AC, with Raymond Braine, won their first five titles, Antwerp FC their first two and the small club of Liersche SK (led by striker Bernard Voorhoof) won their first one in 1931–32. The challengers at the time were CS Brugeois (two titles in that period), Union Saint-Gilloise (one title), Daring Club de