1) Go competition 
The Ōteai was a tournament used in Japan, by the Nihon Ki-in and Kansai Ki-in, to determine the ranking of its go professionals on the dan scale. It was instituted in the 1920s soon after the Ki-in was set up in 1924. Initially it was run in Spring and Autumn sessions in Tokyo, with the pros brought together to play around eight games in each ses...