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Long L group
Path: LifeAndDeath · Prev: L2Group · Next: TripodGroup
Keywords: Life & Death, Shape
The standard long L group
The black shape in this corner is the long L group. It controls more corner space than the L group, and this greatly improves its chances for survival.
This is White's best attack. She produces a somewhat strange ko in the corner. This is known as a ten thousand year ko. The long L group with an extra liberty
This diagram is a modified one with extra liberty at a for the black group. Note that Black is unconditionally alive.
The attack by
If White answers at
(Black 8 at 6)
The strongest attempt for White is to play atari at
If White plays at
The long L group with a descent outside (1)
White with
Black's attempt at a ko lacks liberties instead.
Note:
Kanazawa Problem 18 / Solution includes this variation.
(
Subsequently, if White plays at The long L group with a descent outside (2)
White descends the other way. It is still the case that White to play can kill Black unconditionally.
This is also shortage of liberties. Black can't play at a after Authors: Path: LifeAndDeath · Prev: L2Group · Next: TripodGroup This is a copy of the living page "Long L group" at Sensei's Library. ![]() |