4-4 point low approach, two-space high pincer, without side stone
In the absence of the black stone on the side at the circled point, is joseki: a double kakari here isn't an overplay. Alternatively,
may be played at the 3-3 point as shown further below.
After the double kakari, matters can be expected to take a definite course: up to here is a very well-trodden path in joseki.
After that Black a and b are joseki continuations. Black c is no longer: this variation died a sudden death in 1992 amongst the pros. Klaus: Does annyone know why c is bad ?
To play high is also possible. Then
is still good shape. Next White at a may be the expected answer; but White directly at b has been played consistently enough in pro games since 1994.
If White invades the corner to get settled, up to is an common joseki. Alternatively,
can also be played at
.
Most likely, Black nows plays tenuki. There is some question about Black's play here, if Black does add a stone.
Adding is normally treated as sente by White, because Black's move next at a feels severe.
Therefore the exchange - White a is often seen here before Black takes the initiative to play in another area of the board. With the play at
, Black is trying to confine the
stone on a larger scale. Naturally,
still has plenty of aji.
It is forbidden to strong players to think in terms of adding both and
, though. This is Overconcentrated shape. See more at Honte / Discussion.
A compromise is for Black to play at a. This may have been invented by Kubomatsu in 1931. It gives Black a good next move here at b.
It turns out that white here can also play this way , from move 6 there are many variations , though the most common is show here .
![[Diagram]](../../diagrams/31/b39fb140c5b842664ffea9251b032aca.png)
Double kakari (ChoHunHyun variation)
![[Diagram]](../../diagrams/14/05eab67e12ee5ac9c2807e1ce6372b84.png)
ChoHunHyun variation (continuation)
The variation is expected to go this way If white 6 at a , black ends up doing a squeeze against white by playing b.
![[Diagram]](../../diagrams/32/a0c2bac2c7cd3fc87cb0dd4e9c976cae.png)
ChoHunHyun variation (continuation2)
iopq: I saw this in a game between Cho Chikun and Yamashiro Hiroshi with colors reversed
seems to be overconcentrated
White doesn't get many points.
White a : Black plays b and cuts White. White lives in the corner in gote.
White b : White connects in gote.
AJP: better for white to connect at c instead.
Charles Black's tenuki after
I can believe.
Bill: I wonder about the Japanese 6-dan's comment. Maybe there was no stone in the position discussed. It is urgent here to attack rather than be attacked, it seems to me.
Bill: (A little later.) I did a search on GoBase. White's 3-3 invasion has occurred in very few games, as you might have guessed. When it has, Kogo's variation is typical, but without . (White plays tenuki instead.) Also, White often plays tenuki after
.
unkx80: A likely reason why this "joseki" is rarely played out is because the one-space jump followed by the 3-3 invasion is not really following the flow in most cases - the feeling is that White wants to make moves both outside and inside the corner, which appears somewhat greedy. (Compared to the usual joseki where White directly enters the 3-3, White sacrifices the outside for a fairly large corner.) This results in a smaller corner, while the outside stones are somewhat heavy and subject to attack.
unkx80: If you must play on the left side, then is a much thicker reply. a is way too thin.