Comb Formation

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[Diagram]

Comb formation

The comb formation is always alive. The points a and b are miai.

[Diagram]

Comb formation

The placement at W1 is useless. Black answers at B2, and subsequently 3 and 4 are miai.

[Diagram]

Comb formation

When White attacks the group at W1, Black plays at B2. Now, 3 and 4 are miai.

[Diagram]

Comb formation

White W3 here threatens a snapback at a. There is nothing to worry though, as B4 does the trick.

--unkx80

[Diagram]

Losing Liberties

Shaydwyrm: A key feature of this shape is that white may take away black's outside liberties in sente. For example, W1 in this diagram forces B2 or a, to prevent white from playing at W2 and killing with the sequence a-d.

[Diagram]

Losing Liberties

Likewise when white takes the other liberty with W1, black must again respond or suffer the sequence a-c, which is double atari. These moves by white should not be played immediately, but are good ko threats - the chance to play them is unlikely to disappear, since black pushing out will be gote.


See also:


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This is a copy of the living page "Comb Formation" at Sensei's Library.
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