Takemiya Yoko

Takemiya Yoko (武宮陽光 Takemiya Yōkō, b. 1977) is a Nihon Ki-in professional, 6 dan in 2005. Son of the famous Takemiya Masaki, 9-Dan.

Nihon Ki-in page: http://www.nihonkiin.or.jp/player/htm/ki000356.htm

He was the first professional player to lose with 2 stones against a commercially available program in July 2016: http://www.computer-go.info/h-c/#2106 (the top non-commercially available program AlphaGo had already beaten a top pro, Lee Sedol, in March 2016).