Most go openings emerge from casual games into prominence when they appear in a high-profile match, but the origins of the avalanche joseki in professional play can be fairly accurately traced.
In games from 1927, three years after the founding of the Nihon Ki-in, Kitani Minoru, then aged 18, began experimenting with it after one of his opponents used it against him.
Kitani was a leading figure in the development of the New Fuseki that revolutionized Japanese go in the 1930s, and one can see in the "avalanche" early evidence of his interest in the importance of central influence.
The onadare is the most complex line of all: the konadare can lead to a running fight, but tends normally to force the issue into settled formations.
A new move found by Go Seigen in 1957, in a Saikyo Tournament game against Takagawa Kaku, is probably the most famous joseki innovation since the 'secret weapon' plays in the taisha of the early nineteenth century.