Gokyo Shumyo, Section 1, Problem 70

White to live  

(Unsound (Shitsudai) from today's standards; there are four moves to live)
Solution
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Here we have a weak carpenter's square ^[1] with a leg ^[2], which has been attacked at the vital point. In carpenter's square variations, White attaches at a 1-2 point. Here too? And will White play her first move on the leg side?

[1] meaning the absent stone at the 4-4 point.
[2] meaning the marked white stone.