In 1949, the decision was made to hold the championship, that took place every year except during
World War II (1943–1944), every two years, and to hold Hemisphere Championships (Europe and Africa championship and Western Hemisphere & Orient Championship) and World Championships in alternate years. in 1973, a Junior World Championship independent event was created. In 1986 the World Masters Championship and in 1994 the Women's World Championship were added. ==Open Worlds==