Gokyo Shumyo, Section 1, Problem 40 / Solution
Solution
![[Diagram]](../../diagrams/15/2e5cb7d9ab005910486b63da249ec7be.png)
Black to live
is the vital point. It clearly secures two eyes at the circled points.
![[Diagram]](../../diagrams/21/81318aafeb09ae4de02e2188389985bc.png)
Main line
![[Diagram]](../../diagrams/26/4a845d5e3d8c9882ab9ed603a8862833.png)
Continuation 1
Note what a difference an extra white stone at a would make.
![[Diagram]](../../diagrams/34/78debb78fe2f990e6e052fba26c1023e.png)
Continuation 2
Again, an extra stone at a would make the difference.
Failures
Once the vital point has been played -
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]](../../diagrams/50/49f1e12bc5be1b6643f497ef16e0eeaf.png)
Failure 1
One is tempted to cover the two-space gap with a move like
here. However, White strikes at the vital point after reducing the eyespace.
at
is met by
at
.
![[Diagram]](../../diagrams/42/a330a256b460783e26b143b66371c924.png)
Failure 2
The other ceiling defense at
is defeated by
and
!.
at a also kills with more difficult variations.
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