GokyoShumyoSection3Problem79/Attempts

So why is this Ko and not clean-life like in the similar problem Gokyo Shumyo, Section 1, Problem 74?

It seems it depends on the strength of the black outside.

[Diagram]

Seems to be Ko

[Diagram]

Reference: If white tries the same approach like problem 1-74, then black can make life in the corner and the position is still Ko.

[Diagram]

Here W has the forcing move of W5 killing black in the corner


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