Kanazawa Problem 12 / Solution
Main line
![[Diagram]](../../diagrams/5/0bf31f88f2735203e82ad4921bdf7e8c.png) | First move |
There is absolutely no time to expand the eyespace. White has to play at the vital point right now. And the vital point of this shape is .
![[Diagram]](../../diagrams/3/c647c4f3b5f148d1e5bd83577595e84b.png) | Full line |
The points and are miai and after the 2-3 exchange, a and b are miai.
![[Diagram]](../../diagrams/18/8284babdd90778f510b1d907f3063025.png) | Why the vital point ? |
The reason that is the vital point lies in the fact that White can answer the atari of with . Without in place, Black would capture three stones.
Failure
![[Diagram]](../../diagrams/32/8e76e92edd510a907fd9a068cd0d65f2.png) | Wrong |
As said before, expanding the eyespace is not right. Black plays atari at and after , Black can start a ko with at . Life in ko is not sufficient.
![[Diagram]](../../diagrams/19/834ced5d7720cd595d021778d6906dc6.png) | Wrong (ii) |
This shape does not call for the 1-2 point. The points a and b are miai to keep White down to one eye, and Black destroys the other eye by playing .
Playing at b also works. Black should not play the atari as in the previous diagram, because that permits ko. In fact, destroys more eye shape than it makes and she dies unconditionally.
![[Diagram]](../../diagrams/13/9efe039edd5174d93db569d98c2060e1.png) | Wrong (iii) |
After here, Black can kill unconditionally, without a ko. After , White cannot make a second eye due to shortage of liberties. If at , at is a deadly eye shape destroyer.
![[Diagram]](../../diagrams/18/82b4849cdf3c4334b3e53890ba56ef68.png) | Wrong (iv) |
here leads to the same tesuji of to create shortage of liberties.
Problem 13
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2004 the Authors, published under the OpenContent License V1.0.
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