Gokyo Shumyo, Section 1, Problem 70 / Solution

Solutions

[Diagram]

Traditional Solution

White plays on the leg side, on the second line. White lives up to W7. If next Black a...

White can play atari at W4 and Black can't connect at white+circle (oshitsubushi).

[Diagram]

Alternative solutions

In addition, W1 at a to c all live, at least with seki. See /discussion on a.


Failures

[Diagram]

Failure

Bending in from the side without the leg leads to ko. If Black wins the ko, he almost fills White's eyespace with a bulky five. The points a and b are miai for that purpose, and thus serve as a ko-threat for White:

W1 is a ko threat. If B2 fills the ko, W2 at B2 makes seki.


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