Gokyo Shumyo, Section 1, Problem 46 / Solution

Solution

[Diagram]

White lives

The play at W1 is the vital point.

[Diagram]

Continuation

The points a and b are miai now.


Failures

[Diagram]

Failure 1

After B10, Black can almost fill White's eye space with a bulky five. White can do nothing to prevent that without turning her eye space into another dead shape. (/Failure is an obsolete discussion of Failure 1)

[Diagram]

Failure 2

W1 at 2-2 also fails to live unconditionally. Can't avoid ko starting at a.

[Diagram]

Failure 2 Variation 1

W3 here is weaker and leads to direct ko immediately.

[Diagram]

Failure 2 Variation 2

For this W3, Black kills with B4 and B6.


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