Umezawa became a professional Go player in 1996. She then attained the rank of 5-dan in 2002 at the age of 29, and was married in the same year. Umezawa supervised the production of Hikaru no Go, a manga about Go written by Yumi Hotta and illustrated by Takeshi Obata. She also became a consultant for the anime version of Hikaru no Go and hosted Go educational programs on NHK. Umezawa's sensei was Masao Kato. Umezawa is married to Shinya Yoshihara. They have a son (born 2011).