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L+2 group
Path: LifeAndDeath · Prev: L1Group · Next: LongLGroup 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. 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.
Path: LifeAndDeath · Prev: L1Group · Next: LongLGroup This is a copy of the living page "L+2 group" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |