Large avalanche
After , the Large Avalanche pattern is complete (see large Avalanche Simple Variations for the variations where
or
is played elsewhere ).
,
and
next are forced, after which Black can choose amongst a, b and c. Here a is the oldest variation, b is newer and c is most modern, having been introduced by Go Seigen in a game against Takagawa Kaku in 1957. Nowadays, the turn inward at c is the most popular variation, while the turn outward at b is also still played often. See for the follow-ups:
-- Andre Engels