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Gun Eight
Path: LifeAndDeath · Prev: GunSix · Next: SquareNineInTheCorner 1. No outside liberties
When there are no outside liberties, this 8 points large eye shape can be turned into seki or ko. 'a' is the vital point.
After W 1, B 2 threatens to kill the White stone, forcing W 3.
B 4 - W 5 makes seki. W 5 - B 4 does the same. (Although W 5 indicates a desire to avoid ko. In that case Black's reply at 4 is not urgent.) Seki is the usual result, but there is a throw-in ko.
White can throw a stone into the corner to make a 2 step ko. Black can throw in at 2 to make the same ko. However, this ko normally favors White, so Black will usually make seki.
This is a more straightforward way of reaching seki. 4 and 5 are miai : B5 - W4 also reaches seki. 2. Outside liberties
As soon as there is an outside liberty, this shape is alive with 7 points.
Thanks to the outside liberty, Black can atari at 6. Without that extra liberty, Black 6 puts himself into atari.
3. Endgame conclusionsWhen the last outside liberty is taken, the play on the 2-2 is normally a 3 1/2 point gote (Miai Counting). Authors:
Path: LifeAndDeath · Prev: GunSix · Next: SquareNineInTheCorner This is a copy of the living page "Gun Eight" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |