呉清源
After his retirement, Go Seigen remained active in the Go community by teaching, writing, and promoting the game around the world. He authored a number of books on go, some of which include "A Way of Play for the 21st Century", "Modern Joseki Application Dictionary", and "Fuseki and Middle-game Attack and Defense". Go Seigen held study sessions with other professional players such as O Rissei, Michael Redmond, Rui Naiwei, and others.