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LifeAndDeath

 

Gun Six
Path: LifeAndDeath   · Prev: WalkieTalkieSeven   · Next: GunEight
    Keywords: Life & Death

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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Path: LifeAndDeath   · Prev: WalkieTalkieSeven   · Next: GunEight
This is a copy of the living page "Gun Six" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.