This page is in discussion mode and does not represent definite knowledge
Dieter: This is not reported in Ishida but I found 27 games on gobase with this thrust. In almost all games, White's intention is to counter-pincer
. In the remaining few games,
is part of a special plan, mostly a kind of leaning attack, some of which cases Black plays tenuki.
If Black tenuki, White will play , taking outside influence and be one move away from controlling the corner. If Black answers here, it is invariably at
.
This is the most common variation. White will next attack . Black can omit
and care about
instead. If Black omits
to take care of
, White locks Black in with a.
Black only rarely cuts at b with , in which case an exchange takes place: White engulfs the left side, including
and Black takes the top, by capturing
.