The Agon Kiriyama Cup is a Go competition endorsed by the
Nihon Kiin. It was started in 1994 by
Agon Shu. The name was originally the "Acom Cup" but it changed its sponsor in 1999 and became the Agon Kiriyama Cup. It is a single
knockout tournament, but unlike the big titles in Japan, the title holder does not wait for a challenger, hence the difficulty of defending the title. The prize for the winner is 10,000,000 yen, a larger prize than some of the top-seven major titles. The tournament has a counterpart in China, the
Ahan Tongshan Cup; the winners of the two tournaments face off in the
China-Japan Agon Cup. ==Past winners==