probably 1980
P45
Chizu Kobayashi when she was 5 years old, taking 9 stones from Kaku takagawa, 
then 8-Dan and Honinbo. 
Seigi Kobayashi, Chizu's father watches the game in the background. 
Chizu, then rated 2-kyu, lost this game by 14 Points;

Page 31, 32,33,34,35 
My trip abroad
by Chizu Kobayashi, 5 dan
translated by Tako Onishi
This article also appeared in several installments in a Japanese weekly magazine.

Since leaving Narita International Airport (Japan) last July 7 (1979)...