Beginner Exercise 195 / Solution
![[Diagram]](../../diagrams/16/a6496ba23bda5f84c43e40421c510cee.png) | The vital point |
After , a and b are miai to kill (?); if at one, at the other. [1]
![[Diagram]](../../diagrams/42/5b1ce1784878856fd1a53be96241a7d4.png) | Remove outside liberties |
If and go at two of the circled points, then and at the squared points. at the remaining circled point captures, but...
![[Diagram]](../../diagrams/26/64e6e2d6ab633934a264e8a190e19234.png) | The vital point (again) |
here kills the black group.
Notice that in the first diagram at a or b allows at there, which costs white an additional move in connecting and black can either retake the vital point (making eyes) or push outwards through the remaining outside liberty. [2]
[1]
![[Diagram]](../../diagrams/6/b2cb1c178cf719a5c5cf5918b2c50a21.png) | Seki |
unkx80: After and , Black will tenuki. Isn't this a seki?
JoelR: Indeed. White can't threaten to kill without making a capturable live shape. On the other hand,
![[Diagram]](../../diagrams/30/96f5abc3e130cbe59f33d463b52f78d8.png) | Better |
This takes away Black's option, and now even if Black makes no more plays, White can play at the squares for atari, with a bulky five dead shape inside.
[2]
![[Diagram]](../../diagrams/36/3cbdc29436f366912157112071f59413.png) | Black throws in |
JoelR: The throw-in doesn't help Black---after closing off the outside, White can play at the square to make atari and a dead shape. If Black tries to push out with 'a', then 'b' keeps him in.
unkx80: Yes, this is what I am looking for. =)
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"Beginner Exercise 195 / Solution" at
Sensei's Library.
2004 the Authors, published under the OpenContent License V1.0.
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