Counter-atari

  Difficulty: Advanced   Keywords: Shape, Go term

Chinese: 反打 (fan3 da3)
Japanese: アテ返し (ate-kaeshi)
Korean:

[Diagram]
Counter-atari  

W2 is counter-atari, responding to the atari of B1 by giving atari back. This is often a better alternative than the heavy connection at a.


[Diagram]
Follow-up  

B1 naturally captures, after which W2 (or a, depending on the overall position) gives atari. B3 then connects.


[Diagram]
Huge ko  

Instead of connecting, B3 here starts a huge ko fight, potentially a game-deciding ko. White will likely ignore any ko threat and resolve the ko with W6.

[Diagram]
Farmer's hat  

For White to instead connect with W1 here is the farmer's hat, an empty triangle of a very heavy kind. This is rarely a good play.

[Diagram]
Later possibilities  

Black will have a pincer stone at one of the points a to f. With a close pincer (a or b) White now usually connects solidly at p, with the aim of extending to the marked point. With the more distant pincers d and e White makes the trumpet connection at q for better shape (the other two pincers are rare in this pattern).

Charles Matthews


Counter-atari last edited by BobMyers on December 18, 2005 - 18:43
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