Rosenblum Cup is an Open Teams event held every four years as part of the World Bridge Championships. The event was added to the world championships in New Orleans in 1978 to commemorate Julius Rosenblum, who served as president of the World Bridge Federation (WBF) until 1976. A similar event for women, the McConnell Cup, which takes place alongside the Rosenblum Cup was added in 1994.
The full name of this championship is World Open Knockout Teams. The knockout format pertains only to the late stages, however, evidently a six-round knockout with 64 teams in recent renditions. It appears that the field has been divided into sixteen groups for round-robin play, with the top four advancing from each group to the knockout stage.[citation needed]
New Orleans, USA 15 teams
Biarritz, France 129 teams
Miami Beach, USA 25 teams
Geneva, Switzerland 179 teams
Albuquerque, USA 119 teams
Lille, France 233 teams
Montreal, Canada 160 teams
Verona, Italy 173 teams
Philadelphia, USA 144 teams
Sanya, China 123 teams
Orlando, USA 97 teams