Gokyo Shumyo, Section 1, Problem 29 / Solution

[Diagram]

Black lives

[Diagram]

seki at best

White can make a seki in sente. (In practice, Black's counterplay at a or b may well outweigh the loss of territory points.)


[Diagram]

Variation at 2


[Diagram]

no effect

The exchange of B1 and W2 has no effect on the solution.


[Diagram]

Wrong 1

White plays at the vital point.


[Diagram]

Wrong 2

B1 is not a vital point when there are no cutting points inside. Two successive hanes and a three-point nakade kill Black.


[Diagram]

Wrong 2 variation (inferior for white)

An immediate nakade with W2 is inferior: Black has a ko now.


[Diagram]

Wrong 3

The hane creates a bulky five.


[Diagram]

Wrong 3 (variation)

Now a and b are miai.


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