Okada Yumiko (岡田 結美子), née Abe Yumiko (安倍 結美子, born June 22, 1970) is a Nihon Ki-in female professional Go player.
1p: 1989, 2p: 1992, 3p: 1994, 4p: 1996-07-08, 5p: 2001, 6p: 2003-07
She won the 2002 Female Strongest / Women's Saikyo and was runner up in 2004.
Nihon Ki-in page, with photo http://www.nihonkiin.or.jp/player/htm/ki000293.htm.
As online teacher http://www.pandanet.co.jp/lessongo/index_e.htm.