Tatsuaki Iwata (岩田達明, Iwata Tatsuaki, January 2, 1926 – June 30, 2022),[1] also known as Masao Iwata, was a Japanese professional Go player.

[2] Iwata was a 9-dan Go professional from the Nagoya branch of the Nihon Ki-in.

He won his 800th professional game in 2004.

He retired from tournament play in 2011.

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