 In 2012, Zen beat Takemiya Masaki 9p by 11 points (it received five handicap stones), followed by a 20-point win (receiving four handicap stones) in the 6th E&C Symposium in Japan.Zen defeated Kobayashi Koichi (Zen receiving three handicap stones) in the 4th Densei-sen on 23 March 2016.Zen's first commercial version was released in Japan on 18 September 2009.