Gokyo Shumyo, Section 1, Problem 28 / Solution

[Diagram]

Black lives

B1 is maybe a little unexpected.

[Diagram]

Main line

Up to B7, Black sacrifices his black+circle stones, to secure life for his group.

[Diagram]

Continuation

White captures the stones in gote.

[Diagram]

Variation at 6

W6 in this diagram is followed by the atari at B7, and her stones are in shortage of liberties. This is better for Black than the main line.

[Diagram]

Variation at 5

Changing the order of B5 and B7 gives the same result, but it doesn't invite White to make the small mistake at W6 in the previous diagram.

[Diagram]

Variation at 2

Black lives easily.


[Diagram]

Variation at 1

Changing the order of B1 and B3 also seems to work.

[Diagram]

Variation at 1 (part B)

If W2 here, B3 makes miai of a and b.

[Diagram]

Variation at 1 (part C)

With W4 as here, White cannot even capture a stone, because shortage of liberties at a prevents her from making the eye false.

[Diagram]

Failure

Black 1 does not put enough pressure on the invading group, allowing white to capture the two stones on the left. black's remaining stones have only one big eye.


Applications:
The straight J group with an outside liberty resp.
JGroups#100
Problem 29
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