3-4 point high approach, inside contact, hanging connection
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Joseki
to
is a very common 3-4 point joseki. Subsequently, a White move at a or a Black move at b is very large. The reason is that the checking extension of b amplifies the severity of a Black invasion at c. However, it should be noted that even with White a, the invasion at c still exists, but much less severe.
Depending on the left side of the board, may choose to play at d or e.
here settles the position in one move, while
at d or e emphasizes an additional extension on the left side.
playing the clamp at f is an old joseki.
Compared to the joseki when makes a solid connection (see 3-4 point high approach, inside contact, solid connection), deep invasion by Black is quite possible - but it has good prospects for future development.
There are other variants to the joseki, see the section on "Variants" below.
Because the invasion can potentially rob White of his base, it is usual for White to jump at in response to
.
Invasion
The remainder of this page discusses the invasion when White did not defend? his three-point extension.
Because the threatens to connect at a, the standard reply is at
. Many of the sequences after
are well-established enough to be called side joseki.
can be played at b for territory, or c for outside influence.
at d leads to a ko that is heavy for both players, so the timing for this move is important.
A discussion of why is better than a can be found here.
here is not recommended. After
and
,
connects. White has lost his base and his outside is not thick, and Black can aim at cutting the
stone at a. This result is undoubtly favourable for Black.
Going for territory
here goes for territory, so White will get the outside influence. The traditional reply here is
. Here,
is a tesuji which creates a weakness on White's exterior, so the loss-making exchange of
with
is necessary for preventing a Black cut at a.
in the previous diagram can also be played at
here, avoiding the loss-making exchange of a and b. The sequence up to
has also been established as a side joseki.
A more recent variation by White is to play the diagonal move at , followed by a thick move at
.
Going for influence
Making a high small knight's move at here aims at getting influence.
connects and obtains a base, but White' position is generally low.
Black also has the option of attaching at and starting a ko. This is the only sequence that actually severes the connection of the
stone, and usually is the only sequence available when there is no
stone (or even when there is a White at a). The resulting ko can be heavy for both players, because the winner of this ko usually gets something that looks like a ponnuki.
When Black has just taken back the ko, and both players have no more suitable ko-threats, White may consider a move at b. This usually forces Black c, then White can look forward to taking the ko at d and then ending it with a ponnuki at e. Of course, Black gets to play two moves elsewhere.
Variants
It is possible for to make a peep at the hanging connection if Black wants to emphasize the left side. However, the possibility of invasion at a is now essentially lost.
is sometimes seen at b instead.
In recent years, the direct pincer at is also common. In professional games, one of the most common reply is
, and typically Black will tenuki.
may also be played at a, but because the hanging connection is looser than the solid connection, typically Black will plat at b instead of c, and a fight will erupt. See 3-4 point high approach, inside contact, hanging connection, pincer fight for more.
Question
I have a question about this joseki. First of all I hope this is in the right place. I read some of the wiki etiquette pages, but couldn't find anything about where to put questions. So sorry if this is in the wrong place.
Anyway I always wondered why nobody elaborates on this position.
This can't possibly be right because white's position is ruined. But what is the correct continuation? \[Durak\]
Tapir: The best place for longer questions is Big Question Mark, all the people looking at RecentChanges will then instantly see that there is a new question.
According to a game database that is what professionals play here fairly regularly. Here the White position is ruined as well, and White offers even three bonus stones (which black usually don't tries to take for the moment). The reason is, was threatening exactly this, and White did ignore it on purpose to play a big move somewhere else, so White is a move behind and has to expect a black invasion like this. In your second diagram, I don't think White is especially bad after connecting at a. Always remember White got a big move elsewhere. The following is a proposal what to you may want to do, if you intend to ignore the black approach. Exchange
for
before leaving it as it is.