Gun Six

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1. No outside liberties

[Diagram]

Gun six

If there are no outside liberties, this 6 points large eyeshape can be turned into seki. Any of the three marked points accomplishes this result.

[Diagram]

Main line

White makes seki in gote.

[Diagram]

Variation at 1

Starting at 2-2 gives the same result, but ...

[Diagram]

Variation at 2

... starting at 1-2 invites Black to make the mistake of answering at 2-2. White 3 makes a bent four in the corner shape, killing Black.


2. Outside liberties

[Diagram]

Gun six with outside liberty

If there is at least one outside liberty, Black is alive with 5 points.

[Diagram]

Main line

Thanks to the outside liberty, Black can give atari at 4. Without that extra liberty, Black 4 would put himself into atari.


3. Endgame conclusions

[Diagram]

Gun six: endgame

When the last outside liberty is filled, Black 1 makes 5 points in gote (deiri counting).

(As I don't fully grasp miai counting I'd rather have someone else talk about that.)

SAS: Note that 5 points is only correct under Japanese/Korean rules. Under almost any other ruleset the deiri value is only 4 points, since Black would have a point in the seki anyway. As usual for double gote plays, the miai value is half the deiri value (so 2.5 or 2).

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This is a copy of the living page "Gun Six" at Sensei's Library.
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