Although it may seem submissive for White to play at and cede the entire corner, the White group up to
is very strong and is not vulnerable to attacks. White may have the possibility of building up a framework outside.
Alternatively, may just extend. In this case, White is treating the
stone lightly, and may aim at a in the future. White also have the choice of blocking at b later to revert to the previous joseki.
Since Black did not reply with , White can make the double kakari.
is consistent. To allow White to make inroads into the corner may make
inefficient.
Usually Black will not ignore , because after
and
, White settles easily with Black's corner being weak. If
at
, then
at a.
Continuing from the previous diagram, if connects, then White can play the double hane, and the tesuji at
ensures White captures the two stones in sente. If
is played at
, then there is a serious aji at the cutting point at
.
See also: