4-4 point one-space low pincer invasion, interception

  Difficulty: Intermediate   Keywords: Joseki

Table of contents Table of diagrams
Invasion, interception
A basic joseki
Keima - honte answer
Keima (White 2 tenuki)
Pincer
Running into the center
Continuation
Overconcentrated
Minor variation
Understandable mistake
Black resists
Continuation
Second possibility (1)
Second possibility (1.1)
Second possibility (1.2)
Continuation (1)

Blocking with separation

[Diagram]
Invasion, interception  
4-4 point one-space low pincer invasion, interception, hane underneath
[Diagram]
A basic joseki  

If Black intercepts at B1, the joseki to W8 can be expected[1].

White makes decent territory, but white+circle is blighted.



After this, Black has several choices. Among professionals, playing tenuki now seems to be the most common. If White gets to play here next, a is the most likely spot.


Increasing influence & checking from the side

[Diagram]
Keima - honte answer  

With B1, Black extends his influence. After this, White normally answers at W2. This may seem like a lukewarm move, but actually it is honte. Any other way of defending leaves too much aji for Black to aim at. In fact after this solid defence black's influence is rather thin and white has various reductions and other follow-ups to aim at, such as a-d (note that black e is no longer sente), whilst white has solid profit on the left side; so black should be sure this exchange actually benefits him or B1 can end up being a thank-you move.



[Diagram]
Keima (White 2 tenuki)  

If White does not answer B1, Black will make the profitable exchange of B3 for W4. It is painful for White to allow Black this exchange in sente, but still it is playable - the sequence here was played by Cho Chikun (Black) against Kobayashi Koichi in the 1999 Kisei title match.

[Diagram]
Pincer  

The tsume of B1 is rarely played immediately. Nevertheless, it is a common manoeuvre for Black, as a follow-up.



After W2 and B3, White has sente, but Black has confined her to the corner, and now has strength on both sides and towards the center.

[Diagram]
Running into the center  

The alternative for White is to run into the center with W2 and W4.



After W10...

[Diagram]
Continuation  

Black patches up his shape with B1. The continuation to W8 is one possibility.



White has set her sights on the black+circle stones, but B7 makes black thick in the center.

[Diagram]
Overconcentrated  

B1 is not a good move with the one-space low pincer. The black+circle stone is now too close to Black's wall.


Variations

[Diagram]
Minor variation  

Few variations are possible to the basic joseki after B1.



One possibility is for Black to play B7 here rather than at a. The advantage is that White now cannot play at B7, either to connect her stone or cut off Black's wall from the rest of his position on the top, and the hane-connect of White b is not sente in the yose. The disadvantage of course is the possibility of the white cut at a.

Comment: this variation is now not often seen in high-level games. It is widely accepted that the protection against W7 is not worth the various forcing plays from the outside (e.g. White playing at the circled point). It is still occasionally seen, in positions where Black puts emphasis on the top side over the left side.


Mistakes, resp. how to punish agressiveness

[3]

[Diagram]
Understandable mistake  

B3 feels natural (Hane at the Head of Two Stones), but it is a mistake when white+square is in place. (See more at go bloopers.)



There are two ways for White to punish it. The first is by the simple hane and connection of W4 and W6, followed by the clamp-tesuji of W8. If Black draws back at B9, White connects at W10. Compared to the normal joseki, Black has made the extra exchange of B3 for W10 - which is clearly aji keshi.
(the usual: lost attacking potential (s.a.) + lost own liberty + lost ko threat)

[Diagram]
Black resists  

If Black tries to resist with B1, White cuts at W2. One possible follow-up is shown. If Black does not play at B7 (but for example at B9), White wins the semeai after White at B7-Black a - White b.

[Diagram]
Continuation  

Black has been forced into a clumsy shape, while black+circle has been cut off and blighted. The four white stones are far from captured yet.

[Diagram]
Second possibility (1)  

The second possible answer to B1 is W2. If Black connects at W4, White connects underneath at B3 and is satisfied with her corner area. However, if Black descends to B3, White fearlessly cuts at W4. If Black tries to save his stone on the left with B5, White goes after the three black stones with W6.

[Diagram]
Second possibility (1.1)  

tderz: W10 captures the 3 black stones with a wedge tesuji (warikomi)

[Diagram]
Second possibility (1.2)  

tderz: B plays vulgar & futile

[Diagram]
Continuation (1)  

B1 is much better style for an attempt to resist,
yet W4 is an excellent tesuji.
After this move, black is going to get a bad result.[2]


[1] A less common variation is at 4-4 point one-space low pincer invasion, interception, hane underneath - click on W6.

[2] See also the discussion and forum for some of the complexities involved.


4-4 point one-space low pincer invasion, interception last edited by 24.60.141.8 on January 30, 2017 - 15:41
RecentChanges · StartingPoints · About
Edit page ·Search · Related · Page info · Latest diff
[Welcome to Sensei's Library!]
RecentChanges
StartingPoints
About
RandomPage
Search position
Page history
Latest page diff
Partner sites:
Go Teaching Ladder
Goproblems.com
Login / Prefs
Tools
Sensei's Library