Moves and begin the avalanche joseki, and when Black continues with and we get the large avalanche.
To avoid these complications, White can play either a or tenuki with , or Black can play either a or b with . See: large avalanche simple variations.
In the large avalanche, , , and are all forced. Next, Black can choose among 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 1957 game against Takagawa Kaku. As of 2021, the turn inward at c is the most popular variation while the turn outward at b largely disappeared from 2002-2014ーwhere after it received a slight reinterest from Chinese professionalsーand the cut at d received development from 2005-2007.
See for the follow-ups: