Gokyo Shumyo, Section 1, Problem 40 / Solution

Solution

[Diagram]

Black to live

B1 is the vital point. It clearly secures two eyes at the circled points.

[Diagram]

Main line

[Diagram]

Continuation 1

Note what a difference an extra white stone at a would make.

[Diagram]

Continuation 2

Again, an extra stone at a would make the difference.


Failures

Once the vital point has been played - B1 in the main line - the rest is not so difficult any more. Finding that point is the main challenge here. Let's have a look at how things can go wrong.

[Diagram]

Failure 1

One is tempted to cover the two-space gap with a move like B1 here. However, White strikes at the vital point after reducing the eyespace. B3 at W6 is met by W4 at B5.

[Diagram]

Failure 2

The other ceiling defense at B1 is defeated by W2 and W4!. W2 at a also kills with more difficult variations.


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