From Go Seigen at Sensei's Library*:

[Early Life
Go Seigen (吳清源, Wú Qīng yuán, Wu Quan(吳泉), naturalized Japanese name Kure Izumi, 12 June 1914 - 30 November 2014), was a professional 9-dan. He is considered one of the strongest players of the 20th Century and, by many, one of the strongest
players of all time.

Go was born 12 June 1914 (= lunar 19th of fifth month, 1914) in Fuzhou, Fujian Province, China, but was moved to Beijing a few months later to join his extended family. Go Seigen started learning go at the age of nine. He excelled at the game, and by the
time he was 12 years old, he was already of professional strength. Between the ages of 12 and 14, he played against a number of visiting Japanese professionals, such as Iwamoto Kaoru (6-dan), Inoue Kohei (5-dan) and Hashimoto Utaro (4-dan). He managed to
win several games, causing his reputation to spread to Japan....]

* https://senseis.xmp.net/?GoSeigen

If I [HW] remember correctly, my own _sensei_ Shinji Dote [1924--2000] 4-d (amateur), long-time leader of the San Francisco Go Club was also a professional tour guide for many years. Dote-san had occasion to receive Go Seigen for the SFGC and took him on
a tour of Yosemite. Dote recalled that during the whole drive Go thought and spoke only about the game of _go_.

During Dote-san's long chieftainship at our grand old dilapidated temple, located at 1881 Bush St @ Laguna in J-town, the Club was honored to receive many of the most famous champions of the three home countries of the game. Of all these, Go Seigen was,
of course, the most famous.

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)