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Twisted four in the corner
Path: LifeAndDeath · Prev: BentFourInTheCorner · Next: TwoByThreeBox 1. Less than two outside liberties
If there are less than two outside liberties, White can turn this position into ko.
White 3 starts the ko. White can finish the ko by filling at the marked stone. 2. At least two outside liberties
If there are at least two outside liberties, Black is alive with 3 points.
Thanks to the two marked liberties, Black can atari at 4. Without one of those liberties, he would put himself into atari.
3. Endgame implications
When White reduces the outside liberties to 1, Black 2 or 'a' makes 3 points in gote, preventing the ko. Authors
Path: LifeAndDeath · Prev: BentFourInTheCorner · Next: TwoByThreeBox This is a copy of the living page "Twisted four in the corner" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |