The Oteai (大手合) is a form of rank promotion system that originated in Japan. In the system players play games in an, usually, annual or bi-annual tournament to earn rank promotion. Early records of Oteai games exist in groups such as the Hiseikai from the early 1920s. However, the system grew to popularity when the Nihon Kiin adopted it as the primary way for its professionals to earn rank promotion and income from 1927 to 2003. Games were played in a bi-annual tournament with weekly schedules, and players received a fee for each game played. The Oteai games were traditionally played without komi, forcing many professionals to modify their style once they became 5-dan and started taking White more often than Black.
In 2003, the Oteai in Japan was replaced by a different rank promotion system. The new system allows ranks to be earned in three primary ways; 1) accumulating a certain number of wins, 2) ranking high in prize money among same dan players, and 3) entering certain title leagues or winning certain titles.