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
German Judo Federation complemented each other when the DJB was founded. The DDK was responsible for the Dan bearers, teacher training, dissemination and teaching of judo and examinations. The DJB was from 1955 alone responsible for the competition events - for national and international tournaments and championships, after the DAB had transferred in December 1954 its responsibility for the judo sport to the DJB. The DJB was recognized in 1956 by the German Sports Federation and worked together until 1990 together with the DDK. On 2 February 1991, the German Judo Federation of the FRG (DJB) and the German Judo Association of the