Rank in Judo are ranked in ascending numerical order. The ninth ("kudan") and tenth degree black belt ("jūdan") and, theoretically, those higher, have no formal requirements. Only 15 individuals have been promoted to the rank of Kōdōkan 10th dan. On January 6, 2006, three individuals were promoted to this rank simultaneously: Daigo Toshirō, Ichirō Abe, and Ōsawa Yoshimi. This is the most ever at the same time, and the first in 22 years. No one has ever been promoted to a rank higher than 10th "dan", but in theory the Judo rank system is not limited to 10 degrees of black belt. The
Judo in Canada judo are that judoka with visual impairments take hold of their opponent before the start of the match, and the mat has different textures to indicate zones and the competition area. Judo for the visually impaired has a long history in Canada and, according to a newspaper article published in 1952, Ottawa was the home of the only judo club for the blind in the world at the time. In most circumstances, however, visually impaired and sighted judoka belong to the same clubs and practice together. Canada was first represented in international competition by brothers Pier Morten and Eddie Morten