RTG Problem 12 / Solution

Sub-page of RTGProblem12

Solution

[Diagram]

Black is dead

The status of the Black group is that the group is already dead.



Main line

[Diagram]

Main line

The main line is the descent at B1, which looks like it can live with a straight four. But with the correct sequence from W2 to W6, Black is caught with a shortage of liberties, and is unable to play at a.

[Diagram]

Variation

If B3, then W4 occupies the vital point. Later, if Black plays at a, then White can play elsewhere.

[Diagram]

Variation

If B3 here, then W4 plays at the same point.



Other lines

[Diagram]

Variation

B1 tries to make a ko, but the placement at W2 followed by the descent at W4 is a standard tesuji.

[Diagram]

Variation

The hane at B3 is interesting. If W4 is played wrongly, it can lead to a favorable approach ko. With the correct move, Black dies.

[Diagram]

Mistake

W4 is a careless move, which gives B5 a chance to live by an approach ko.

[Diagram]

Variation

B1 makes an eye in the corner, but W2 destroys the eye on the edge.

[Diagram]

Variation

Playing at the 1-2 point does not work here, W2 makes B3 and W4 miai for the kill.


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(OC) 2014 the Authors, published under the OpenContent License V1.0.
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