What year was the Kodokan school and dojo opened ?
The growth of judo in its early years is demonstrated by the growth of the Kodokan itself : 12 mats - May 1882 , at the Eishōji , a Buddhist temple in Ueno 40 mats - Spring 1887 , at Shinagawa 's house , Kōjimachi 107 mats - February 1894 , at Koishikawa - chō , Shimotomisaka - chō 314 mats - January 1898 , at Ōtsuka Sakashita - chō 986 mats - March 1958 , at 2 - chome , Kasuga - chō , Bunkyo , Tokyo Today , the Kodokan has 1,206 mats across the five main " dojo " ( training halls ) — Main , School , International , Women 's , and Boys' — plus a special " dojo " for retired " judoka " and special technique study purposes .