Kyu Exercise 151 / Solution

Sub-page of KyuExercise151

Solution

[Diagram]

Solution

The key move is W1. Its significance will be apparent in the failure diagrams.

[Diagram]

Solution

If B2 blocks, then W3 occupies the vital point and turns the bottom eye into a bulky five dead shape in sente. Note that Black cannot connect by capturing with B6.

[Diagram]

Solution

If B2 defends this way, then W3 moves in and kills.


Failure

[Diagram]

Failure

Directly occupying the vital point at W1 allows B2 to save half of his group. For the purpose of this problem, this result is considered a failure.

Notice that B2 is the same point as W1 of the solution, and B2 threatens to connect out to the left side (as in this diagram) as well as to make a seki at the bottom side (see next diagram).

[Diagram]

Failure

Blocking with W3 allows Black to save his entire group in a seki.

[Diagram]

Failure

The atari at W1 is superfluous, allowing Black to live unconditionally. After B6, White cannot win the capturing race on the right side.

[Diagram]

Failure

If W1 destroys the eye on the upper side, then B2 takes the vital point and lives easily.


This is a copy of the living page "Kyu Exercise 151 / Solution" at Sensei's Library.
(OC) 2012 the Authors, published under the OpenContent License V1.0.
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