Gokyo Shumyo, Section 1, Problem 43 / Solution

[Diagram]

Main line

The black group makes a comb formation with unfinished 'legs'. Here B1 is the vital point.

[Diagram]

Variation 1

[Diagram]

Variation 2


[Diagram]

Failure 1

Knowing the comb formation tempts one to extend the leg with B1. White plays W2 to create a bulky five and plays W4 at the vital point.

[Diagram]

Failure 1 variation


[Diagram]

Failure 2

So, since the white+circle stone seemed to be the one spoiling the comb party, Black tries B1 here. Up to W6 he gets a ko.


[Diagram]

Failure 3?

Black extending to enlarge his space seems to work. Anyone counter this diagram ?

[Diagram]

Failure 3?

How about W2 to get an advantageous ko?


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