Initially, the tournament was an eight-team tournament divided into two groups, which played round-robin. The top two from each group played off for the gold, and beginning in 1999 the bottom two played off to determine placement and relegation. In 2004, 2007, 2008, and 2009 the tournament was played with nine nations, using three groups of three playing round-robin. In this format first place from each group continued on to play for gold, second place from each group played for placement and an opportunity to still play for bronze, and the third place teams played off to determine relegation. Beginning in 2011, the tournament changed the format to encourage more equal games. The top four seed nations played in Group A, where the top two teams got a bye to the semifinals, the bottom two go to the quarter-finals to face the top two finishers from Group B. The bottom two from Group B then play each other in a best of three to determine relegation. Beginning in 2019 the tournament was expanded to ten teams, bringing with it a new format. The ten teams are divided into two groups of five and play round-robin. In this format, the five teams in Group A and the top three teams from Group B move into the Quarterfinals, seeded A1vsB3, A2vsB2, A3vsB1, and A4vsA5. The bottom two from Group B now play only one 9th place game and both get relegated. As of 2021, the four teams that lose their quarterfinal games enter into a knockout tournament to determine 5th place with the winner earning a spot in Group A for the next tournament.