4-4 point low approach attach
Keywords: Joseki
at:
a hane: black can block (see variation), extend (see variation) or cut (see variation)
b, the wedge (see variation) requires a favourable ladder.
c invade (see variation)
Not joseki:
- d is not joseki, see BQM 97.
- e the stretch &peep isn't normally good either (see variation)
- a move like f does not put enough pressure on the attaching stone and allow Black to make a perfect tiger mouth, while it doesn't sacrifice the stone either.