Go was then 14. His mind was still impressionable. However, mimic go itself is not specially new. It was studied long ago, in the age of Lord Kibi Mabi. So it was not an invention and Go must have felt he could play where he liked.
Most people hesitate a little.
In that sense he is an awesome person. Igo Ichigo Ichie by Hashimoto Utaro publihsed by Naniwa-juku Sousho, Osaka, 1992. Discuss this article on our Go message board .