4-4 point low approach high extension, slide, attachment
Difficulty: Expert Keywords: Joseki
This choice of is an old idea of Go Seigen (and other pros) which was taken up again from 1991 by Korean players. There are now some worked-out joseki for it.
When White answers with here, White can live in sente in the corner after these plays (White a, Black b to finish the joseki). There is a cutting point at c but Black can't expect to cut there immediately, before the left side formation is stronger. At the cost of being a little thin, Black has indeed developed on both sides.
There is also a joseki in which is hane underneath the contact stone
; it depends on the ladder with
.