A short history of the World Cup format

The first World Cup, played in Uruguay in 1930, was an invitational: thirteen teams travelled, four European sides among them, and the hosts won it. There was no qualifying tournament because there was no need for one.

Groups, then knockouts, then both

Early editions experimented. Some used straight knockout from the first round, which meant a team could travel across an ocean for ninety minutes of football. Group stages were introduced to guarantee more matches, and the combination now taken for granted became the stable template in the second half of the twentieth century.

The tournament was interrupted

No World Cup was played in 1942 or 1946 because of the Second World War. The competition resumed in Brazil in 1950, whose final phase famously used a round-robin group rather than a single final match.

Expansion follows the map

Each expansion of the finals reflects the growth of confederations outside Europe and South America. More places change the qualifying arithmetic more than the finals themselves.

Why format matters

Format decides what the trophy measures. A pure knockout rewards a hot fortnight. A long group stage rewards depth. Every change to the bracket is a change to the kind of team most likely to win.