She began playing Go at the age of nine while learning from her father, Sándor Kőszegi, who also taught Go to primary school students.

At the age of 11, she began studying under Tibor Pocsai, the winner of the European Go Championship in 1988, while also teaching Go on the KGS Go Server.

In 1996, she met 9 dan professional Yasutoshi Yasuda, with whom she kept in contact and Shigeno Yuki, a friend whom Kőszegi considers as close as a sister.

In 1998, she placed 9th at the female equivalent of the World Amateur Go Championship and was invited to Japan and South Korea to study as an insei.

[clarification needed] In 2003, she studied at the Hungarian university ELTE in the programming mathematician department, but was unable to complete her course due to an invitation from the KimWon Baduk Academy sent by Eo Jong Soo (7 dan Korean), who Kőszegi met at the World Championship held in Korea in 2003.