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KanazawaProblem12

 

Kanazawa Solution 12
Path: KanazawaSolutions   · Prev: KanazawaSolution11   · Next: KanazawaSolution13
    Keywords: Problem

Main line

[Diagram]
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 1.


[Diagram]
Full line

The points 2 and 3 are miai and after the 2-3 exchange, a and b are miai.


[Diagram]
Why the vital point ?

The reason that 1 is the vital point lies in the fact that White can answer the atari of Black 2 with White 3. Without 1 in place, Black would capture three stones.



Failure

[Diagram]
Wrong

As said before, expanding the eyespace is not right. Black plays atari at 2 and after White 5, Black can start a ko with 6 at 2. Life in ko is not sufficient.



[Diagram]
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 2. Playing 2 at b also works. Black should not play the atari as in the previous diagram, because that permits ko. In fact, White 1 destroys more eyeshape than it makes and she dies unconditionally.



[Diagram]
Wrong (iii)

After W1 here, Black can kill unconditionally, without a ko. After B6, White cannot make a second eye due to damezumari. If White 5 at B6, Black 6 at W5 is a deadly eyeshape destroyer.


[Diagram]
Wrong (iv)

W1 here leads to the same tesuji of B2 to create damezumari.


Problem 13
Back to KanazawaTesujiSeries



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This is a copy of the living page "Kanazawa Solution 12" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.