Hanging connection

  Difficulty: Introductory   Keywords: Shape, Go term

Chinese: 虎接(hǔ jiē)
Japanese: 掛け継ぎ/カケツギ (kaketsugi)
Korean:

Table of contents Table of diagrams
Connection
Solid connection
Blocking along the side
Double hanging connection
Avoid two peeps
A raw peep

Black to play
Black Failure
Black Success
Bulge vs hanging connection

The hanging connection is an application of the tiger's mouth shape and serves at least two distinct purposes: an indirect way of defending a cutting point, and a way of blocking inroads to a certain part of the board.

Defending a Cutting Point

[Diagram]
Connection  

Black has a cutting point at a. Playing B1 defends it, making a hanging connection.

[Diagram]
Solid connection  

A solid connection in this case creates an empty triangle and is less efficient. White can more easily play a later.


Blocking inroads

[Diagram]
Blocking along the side  

If White advances with W1, then the hanging connection of black+circle backs up B2 to block off the upper side. As a minor setback, this allows White to play a forcing move, with the peep at a.

Bill: In fact, B2 may be better at a.



Double hanging connection

[Diagram]
Double hanging connection  

In this case B1 covers two cutting points. See trumpet connection. However, this allows for two forcing moves, at a and b:


[Diagram]
Avoid two peeps  

Because a double hanging connection allows two peeps, it should often be avoided. Here B1, or a, might be better.


[Diagram]
A raw peep  

Incidentally this case W1 may be criticized as a raw peep: a peep at a cutting point that still might be useful as a cut (depending on the ladder).

Bill: Also, B2 is hardly forced.



Endgame impact

[Diagram]
 

It should be noted that the hanging connection changes the endgame hane-connect W1 from sente (if black+circle at a instead, then Black must play b) to gote.

Alternatives to the hanging connection

[Diagram]
Black to play  

Black seeks to block White from entering the top side of the board where Black's position suffers from an open skirt.

[Diagram]
Black Failure  

While B1, a bulge [1], blocks White from entering the top side from the corner, White is able to use the forcing move of W2 to establish a foothold on the top side. The two Whites stones (W2 and W4) do not have a base at this time as there is not enough eyespace. Nonetheless, depending upon the surrounding positions, these stones may be able to escape to the center.

[Diagram]
Black Success  

By playing this alternative diagonal, Black succeeds in blocking White. (Based upon Cho Hun-hyeon Weiqi Sucheng volume 2, problem 80, page 163). B1 should not be seen as a hanging connection by the way since the marked stones are already connected.


[1] Calling this move a hanging connection is problematical. A turn forms a solid connection, but we would not say in the next diagram that we use a solid connection to block the opponent on the side.

[Diagram]
Bulge vs hanging connection  

See also


Hanging connection last edited by 74.62.161.162 on September 20, 2011 - 20:58
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