b. 1964-07-28, in Aichi Prefecture
Nihon Ki-in professional
As of the end of 2021, Katayama's played almost a thousand official games (978). His win-loss ratio is almost exactly 50% (50.3%, to be more exact). In 2002, he received an award for reaching 300 wins. Full statistics are available on his Ki-in page.
Like many older players, he has some jigo (11) in his playing history, from no-komi events like the Oteai. He's also had a no result, probably one of the only nineteen to have occurred in Nihon Ki-in games before 2007. This decision is usually due to the appearance of an endless sequence, like a triple ko or 10,000 year ko, from which neither player will back down.