is a female professional 6 dan Go player.Yumiko Okada's professional record. Nihon Ki-in. Retrieved 27 February 2010
Biography Born Yumiko Abe (安倍 結美子), Okada is the daughter of Yoshiteru Abe, who also acted as her tutor. She is married to Shinichiro Okada, a 7 dan professional. In 2004, Yumiko Okada obtained the rank of 6 dan.Yumiko Okada's entry. GoBase.org. Retrieved 27 February 2010
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