The ranking system is used by many Japanese, Okinawan, Korean, and other martial arts organizations to indicate the level of a person's ability within a given system. Used as a ranking system to quantify skill level in a specific domain, it was originally used at a Go school during the Edo period. It is now also used in most modern Japanese fine and martial arts.
Martial arts writer Takao Nakaya claims that this dan system was first applied to martial arts in Japan by Kanō Jigorō (1860–1938), the founder of judo, in 1883, and later introduced to other East Asian countries. In the modern Japanese martial arts, holders of dan ranks often wear a black belt; those of higher rank may also wear either red-and-white or red belts depending on the style. Dan ranks are also given for strategic board games such as Go, Japanese chess (shōgi), and renju, as well as for other arts such as the tea ceremony (sadō or chadō), flower arrangement (ikebana), Japanese calligraphy (shodō), and Japanese archery (Kyudo). Today, this ranking system is part of the hallmark, landscape, and cultural "adhesive" of modern Japanese society.
The Chinese character for the word dan (段) literally means step or stage in Japanese, but is also used to refer to one's rank, grade, or station, i.e., one's degree or level of expertise, knowledge and seniority. In Chinese pinyin, however, the same character is pronounced duàn in Mandarin with the 4th tone, and was originally used to mean phase. Dan is often used together with the word in certain ranking systems, with dan being used for the higher ranks and kyū being used for lower ranks.
History
The dan ranking system in Go was devised by Hon'inbō Dōsaku (1645–1702), a professional Go player in the Edo period. Prior to the invention, top-to-bottom ranking was evaluated by comparison of handicap and tended to be vague. Dosaku valued the then highest title holder, Meijin at 9 Dan. He was likely inspired by an ancient Chinese Go ranking system (9 Pin Zhi) and an earlier court ranking system (nine-rank system), although lower numbers are more senior in those systems.
Dan ranks were transferred to martial arts by Kanō Jigorō (1860–1938), the founder of judo. Kanō started the modern rank system in 1883 when he awarded shodan (the lowest dan rank) to two of his senior students (Shiro Saigo and Tomita Tsunejirō). Prior to this, martial arts schools rewarded progress with less frequent menkyo licenses or secret scrolls.
There was still no external differentiation between yūdansha (black belt ranks) and mudansha (those who had not yet attained a dan grade). Different athletic departments within the Japanese school system were already using markers of rank, most notably in swimming, where advanced swimmers wore a black ribbon around their waists. Kano adopted the custom of having his yūdansha wear black obi (belts) in 1886.
At that time, these obi were not the belts that karateka and jūdōka wear today; the students were still practicing in kimono. They wore the wide obi still worn with formal kimono. In 1907, Kanō invented the modern keikogi (white practice uniforms), and belts in white for mudansha and black for yūdansha.
Modern usage in Go
Traditionally, the level of Go players has been defined using kyū and dan ranks. Kyu ranks are considered student ranks, whilst dan ranks are considered master ranks. Especially in amateur play, these ranks facilitate the handicapping system, with a difference of one rank roughly corresponding to one free move at the beginning of the game. With the ready availability of calculators and computers, "rating" systems have been introduced. In such systems, a rating is rigorously calculated on the basis of game results.
Dan (abbreviated online as "d") ranks are for advanced players. Although many organizations let players choose their own kyū rank to a certain extent, dan ranks are often regulated. This means that players will have to show good results in tournaments or pass exams to be awarded a dan rank. Serious students of the game will often strive to attain a dan rank. Dan ranks are generally available up to about 7th dan; professional player ranks go up to 9th dan.
Modern usage in shogi
As in Go, shogi has also traditionally used "dan" and "kyū" ranks to define the playing strength of a shogi player. Amateur players can, through over-the-board (OTB) play, achieve ranks from 15-kyū to 8-dan. In addition to dan and kyū, an Elo-type rating system is also used by the Japan Amateur Shogi Association for the tournaments it organizes.