Igo is a match-up board game, in which two players alternately place black and white stones on the vacant intersections of line grid on the board called “Goban.” The objective is to control a larger territory than the opponent’s by placing one’s stones tactically. Igo originated in ancient Chinese horoscope, which was carried out around 2000 years ago, and it was gradually changed into the present form. Igo was introduced into Japan in the Nara period (710-794), when it gained popularity among noblemen and priests. In the Edo period, it came to be played by the general public and “Gokaijo (Igo play house)” were established in towns. The Shogunate encouraged the establishment of Go academy and the schools of Honinbo, Yasui, Inoue, and Hayashi competed each other. After the Meiji Restoration, the school system was abolished and anyone could challenge to be a professional Igo player through ability. In these days a manga story has created Igo boom among the young generation, and a lot of young people have become interested in Igo. Igo is also played on the Internet. It can be said that full-scale inernationalization of Igo game has gotten under way.