Gokyo Shumyo, Section 1, Problem 19 / Solution

[Diagram]

Black lives

B1 is the only conceivable move: no other move prevents White from linking up her stone inside the black group and destroying his eye space.

[Diagram]

Main line

White can make a ko shape but can't win the ko: black has enough liberties to squeeze. Black is alive.

[Diagram]

Variation 1

W2 knows only one answer.

[Diagram]

Variation 2

[Diagram]

Question

Question: What after White hanes immediately?
xela: I think black can simply block at a.

[Diagram]

White hane, followup

Here, a and b are miai, so black is alive.


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