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Hane tsugi
Path: PleaseReviewMe   · Prev: KanazawaProblem62/Solution   · Next: StrangeOpeningFromAProGame
  Difficulty: Advanced   Keywords: EndGame

[Diagram]
Hane Tsugi

Hane Tsugi or hane-connect is the sequence of moves W1 to W3. It is a typical endgame move. This diagram gives the basic shape. There are a few issues.


1. Black's connection

First of all, Black has to decide whether to connect or not.

[Diagram]
Hane Tsugi

If he decides to connect, there are basically three ways for Black to do so.


2. White's shape

[Diagram]
Two stones

When White has two stones on the second line, covered by black stones on the third as here, the hane tsugi is not possible because of Black's atari at B4. This situation is considered to be Black's endgame sente.


[Diagram]
Three stones

With three stones, there are some problems. White has to be careful of a throw-in B2 at W3. Therefore W1 at W3 is often correct (a case of One-Two-Three).



3. Black's shape

[Diagram]
Weakness 1

Black's shape can have a comparable weakness. Instead of connecting at B4, W3 plays atari and W5 captures three or more black stones . Black can start a ko, but the ko entirely favours White (hanami ko).


[Diagram]
Weakness 1

Black should stretch once, then block.


[Diagram]
Weakness 2

With WC present, Black has another weakness to be careful of. If he blocks at B2, W3 is severe. If Black captures at a, White b will at least capture two stones and destroy black's defence line. If Black b, White c is more than White could expect to begin with.


[Diagram]
Weakness 2

Here too, Black should cede a little territory. The empty triangle of B2 is best when there is no eye shape at stake:


[Diagram]
Weakness 2

If Black plays B2 in fear of bad shape, he loses two more points compared to the previous diagram.


[Diagram]
No weakness 2

If Black has BC present, no such weakness exists.


Authors


Hane connect exercise 1
Hane connect exercise 2
Hane connect exercise 3



Path: PleaseReviewMe   · Prev: KanazawaProblem62/Solution   · Next: StrangeOpeningFromAProGame
This is a copy of the living page "Hane tsugi" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.