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L+2 group
Path: LifeAndDeath · Prev: L1Group · Next: LongLGroup
Keywords: Life & Death
The L+2 group is an L group with a leg on both sides.
The L+2 group is alive. The corner territory can be reasonably counted as 6 points. We will have a look at: the defense against the hane from either side; how to deflect attacks from within; and the status of this group when White has a stone on either of the marked points. 1. Defence against a hane
Against the hane from the short side, one should defend at the 1-2 point. Now there are two sure eyes at the circled points.
Answering at the 2-2 point leads to seki - or to ko if that is what Black really wants (see bent four in the corner).
Against the hane from the long side, one should defend at the 2-2 point. Now there are two sure eyes at the circled points.
Answering this hane at 1-2 leads to disaster. Black can't play 8 at a because of shortage of liberties. If Black 6 at a, White 7 at 6 kills: see rectangular six in the corner.
Bill: How about B 6?
2. Attacks from within
Here a and b become miai.
Here a and b become miai. 3. An extra stoneIn many of the variations above, Black suffers from shortage of liberties as soon as one of the circled points is filled by White.
4. Weak leg
If Black has a weak leg, White can kill with a rogue ko.
Black cannot play atari at a due to a shortage of liberties. Path: LifeAndDeath · Prev: L1Group · Next: LongLGroup This is a copy of the living page "L+2 group" at Sensei's Library. ![]() |