Toshio Sakai (酒井 利雄, Sakai Toshio, 1920 – 1983) was a professional Go player.
Sakai was promoted to 6 dan in 1970.
Some players he taught include Baba Shigeru, Ito Yoji, Hikosaka Naoto, Hiroe Katsuhiko, Okumura Hideo, Hamanaka Takamitsu, Akedo Kazumi, Ikezaki Tokinori, and Hotta Seiji.
Was never a runner-up to any tournament[1]
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