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Gun Eight
Path: LifeAndDeath · Prev: GunSix · Next: SquareNineInTheCorner Path: GiveMeLiberties · Prev: LibertiesStonesRatio · Next: CapturingRace 1. No outside liberties
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.
After White 1, Black 2 threatens to kill the white stone, forcing White 3.
Black 4 - White 5 makes seki. White 5 - Black 4 does the same. (Though White 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 two-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. Here 4 and 5 are miai : Black 5 - White 4 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 Path: GiveMeLiberties · Prev: LibertiesStonesRatio · Next: CapturingRace This is a copy of the living page "Gun Eight" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |