4-4 point 3-3 invasion, jumping away

  Difficulty: Expert   Keywords: Joseki
[Diagram]
The modern move  

This choice of B1 is a relatively modern move, which became quite popular from the late 1980s onward. The aim of the move is to keep sente. In professional play, a has been the common response. Since the advent of strong bots, B1 has been the usual move in the invasion patterns, and b is the most common response.


Table of contents Table of diagrams
The modern move
Black can tenuki
Extension
Double hane to keep sente
Inside hane
resisting W5 @ BB
Inside and outside hane
Going for the left side
Securing the group
A fight
White attaches
Extend
Alternative move order
White's hane
Fight
White has the ladder
If black has the ladder
Continuation
Continuation 2
Hiki
Continuation


Main line: bump

[Diagram]
Black can tenuki  

After the W2-B3-W4 exchange, Black can play away, if the board is mostly empty, to be the first to play in an either empty or 1 stone corner.

The price for playing away is that White can play a. Black remains with a wall without extension. AI bots have evaluated this as playable for Black.

If Black continues here, he should do so at a, b or c. The simplest move is a, but c is most common in professional play.

[Diagram]
Extension  

B1 builds a wall, but it has the disadvantage of giving up sente. White can try to peep at a, but she has to reckon with the possibility of Black withstanding the peep with a move like b.

[Diagram]
Double hane to keep sente  

If Black plays double hane at B1, he can take sente upto W6. Later, a ko can be fought with Black a, White b, Black W1. White can stop this by playing c herself.

[Diagram]
Inside hane  

With the inside hanes at B1 and B3, Black forces White into the corner, but loses sente. (B7 can also strongly connect at a). White can play elsewhere

[Diagram]
resisting W5 @ black+circle  

White can resist like this. She gets out in sente with W9, but Black makes a lot of profit and gets central influence.

[Diagram]
Inside and outside hane  

Using the inside and outside hane, Black locks white into the corner from both sides.

[Diagram]
Going for the left side  

If Black doesn't mind giving up the top, he can go all out for the left side by playing B5 in the previous diagram at B1 here.


White's continuation after black tenuki

[Diagram]
Securing the group  

If Black plays tenuki, White has two main ways to continue, one peaceful, one fighting. This shows the peaceful variation, where White secures the corner territory and a connection to the outside while weakening Black's wall. Black however has sente again.

[Diagram]
A fight  

Playing atari on the other side with W1 leads to a fight upto W5. The moves shown here are a common continuation, but as usual in fighting joseki there is a lot of room for variation, and the fight is only beginning.




The attachment

[Diagram]
White attaches  

After W2, black can try any of a-d. Black a leads to the variations at 44Point33InvasionExtension, whereas b reverts to the "hane-stretch" variations at 44Point33InvasionJoseki.

[Diagram]
Extend  

Black c leads to this variation, in which black loses sente. However, black can sometimes tenuki after W4.

[Diagram]
Alternative move order  

In recent professional games, white plays W2 before W4, making it harder to tenuki.

[Diagram]
White's hane  

In pre-AI games (2016 and earlier), white would often play hane and connect with W1 before pushing down the side. Black can sometimes tenuki after W7.


Fighting variations

[Diagram]
Fight  

More often, B3 is played as hane, starting a fight. After B7, white will usually cut at a or b, although c is also seen occasionally.


Inside cut

[Diagram]
White has the ladder  

This W1 relies on a ladder -- but for parallel fuseki, the ladder will normally be in white's favour. B2 is a key point of this shape. After W5, black can continue at a or b, and a complicated fight will follow.

[Diagram]
If black has the ladder  

If white's ladder at a is broken, then white collapses. Instead of cutting at W4, white has to give way by playing W8.


Outside cut

[Diagram]
Continuation  
[Diagram]
Continuation 2  

Black can continue the fight with any of a through d


Pulling back

[Diagram]
Hiki  

Instead of fighting with W4 at B7, white can try this more peaceful continuation. After W4, Black will try to hem White in in the corner, but White can still decide to fight by playing W6 here instead of W8

[Diagram]
Continuation  

This diagram shows one possible continuation.

Chris Hayashida: There looks like there's a problem with the continuation. Black will just extend from B7 and capture three stones. Is Black supposed to play an atari first?


See also

[ext] This video by Yeonwoo.


4-4 point 3-3 invasion, jumping away last edited by ChrisHayashida on August 15, 2020 - 03:01
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