Masao Kato Honorary Oza (加藤 正夫, Katō Masao, March 15, 1947 – December 30, 2004), also known as Kato Kensei (加藤剱正 Katō Kensei), was a Japanese professional go player. A late bloomer, Kato won 46 titles, including the Oza eight times in a row. He also became the second player to reach 1,200 career wins, behind Rin Kaiho.
Kato is the author of The Chinese Opening: The Sure-Win Strategy (published in English by Kiseido Publishing Company) and Kato's Attack and Kill (published by Ishi Press).
Kato joined Kitani Minoru's go dojo in 1959, quickly becoming friends with Ishida Yoshio. The two became sparring partners and kept a close relationship up until Kato's death. In 1964, Kato passed the pro exam at age seventeen. Along with Takemiya Masaki and Ishida, the trio became known as the three crows of the Kitani dojo. Kato began qualifying for tournaments early on in his professional career. He made the Honinbo league in 1968 as a 4 dan, a feat unheard of at the time. Kato was unable to progress past the group stages and was relegated. However, he challenged title holder Rin Kaiho the following year, losing four games to two.
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