Gun Eight

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    Keywords: Life & Death, Shape

Table of contents Table of diagrams
Gun Eight
Main line
Continuation 1: Seki
Continuation 2: Ko
Variation at 2: seki
Gun Eight with outside liberties
Gun Eight with outside liberties

1. No outside liberties

[Diagram]

Gun Eight

When there are no outside liberties, this eight-point large eye shape can be turned into seki or ko. In this position a is the vital point.

[Diagram]

Main line

After W1, B2 threatens to kill the white stone, forcing W3.

[Diagram]

Continuation 1: Seki

B4/W5 makes seki. W5/B4 does the same. (Though W5 indicates a desire to avoid ko. In that case Black's reply at B4 is not urgent.)

Seki is the usual result, but there is a throw-in ko.

[Diagram]

Continuation 2: Ko

White can throw a stone into the corner to make a two-stage ko.

Black can throw in at B2 to make the same ko. However, this ko normally favors White, so Black will usually make seki.

[Diagram]

Variation at 2: seki

This is a more straightforward way of reaching seki. Here B4 and W5 are miai : B5/W4 also reaches seki.


2. Outside liberties

[Diagram]

Gun Eight with outside liberties

As soon as there is an outside liberty, this shape is alive with 7 points.

[Diagram]

Gun Eight with outside liberties

Thanks to the outside liberty, Black can atari at B6. Without that extra liberty, B6 puts himself into atari.


3. Endgame conclusions

When the last outside liberty is taken, the play on the 2-2 is normally a 3 1/2 point gote (Miai Counting).


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This is a copy of the living page "Gun Eight" at Sensei's Library.
(OC) 2007 the Authors, published under the OpenContent License V1.0.
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