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Referenced by
RespondToAttachme...
AttackAndDefence

 

Extension
  Difficulty: Beginner   Keywords: Attack & Defence, Tactics

See also:


[Diagram]
Diag.: A frivolous extension

Black 1 is an extension. It is rock-solid, but not very good at expanding territory. It is usually only played when the stone being aided must be fortified.

This kind of extension is known as nobi.


[Diagram]
Diag.: Other extensions

This figure shows some more common extensions. Black 1 is an extension from his shimari on the left. Next white extends to 2 to form a base for her stones. Black plays 3, extending from his corner stone in order to prevent a white double kakari.




[Diagram]
Diag.: Fig 3. Black 3 is an example of extension an in reply to an attachment.

Black 1 is a pincer that aims at the attack of the solitary white stone.

Why so far? This is only one of the possibilities. The purpose is to deny white a two space extension. If it communicates well with the stones on the lower side it is the best move.

White 2 is a proposition to choose: the side or the corner? Note, that an attachment is played by a weaker side, not by a stronger one.

Black 3 chooses the side. It is the extension that we talked about.


[Diagram]
Diag.: Fig. 4. The most probable continuation.

White 4 takes what is left - the corner. Black 5 is a pleasant move to play. It is forcing, takes the base from white.

White has no choice but to make another extension.

Black plays keima 7 along the side. Keima has several purposes here. It is hint at possible further extension along the top and at the surrounding white stones in the corner. It is high, so is more useful for fighting reasons.

Everything stops for some time here, because the value of the moves temporarily drops. White can build eyes in the corner or in the center when attacked. Playing 'a' at the moment is not big enough. For black exchanging 'a' for a white stone in the center is not favourable. Both sides wait for the development in other areas. At some point of the game 'a' will become urgent.

 I'd put this in joseki but for one reason.
 I don't know how to call it. Is there a name for this joseki?
 Komoku-low-kakari-wide-hasami-tsuke-kosumi.

--HolIgor



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