Gokyo Shumyo, Section 2, Problem 2 / Solution

Traditional solution

[Diagram]

Main line

B5 kills the group without ko. This line works in the corrected version too.

[Diagram]

Variation 1: B5 here also kills

a and b become miai for the kill. This is inferior to the main line because white has more ko threats.

[Diagram]

Variation 2: W4 captures

After B5 white is left with the bulky 5 shape.

Alternatives

[Diagram]

Attack from the right

However Black has three more moves to kill: a to c.

[Diagram]

shortage of liberties

For example, this line kills because White can't connect at a.


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