Beginner Exercise 212 / Solution

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Status: Black is dead as it stands. Both sides should play elsewhere. (Black has two ko threats inside here.)

Black first

Black playing first can't change the dead status.

[Diagram]

Proof 1

B1 does not work, since W2 almost fills with a bulky five and Black is dead. B1 at a does not work for the same reason.

[Diagram]

Proof 2

B1 throw-in fails too. Black can't play at a for shortage of liberties. He could make life in this way if he had one or more outside liberty.


White first

[Diagram]

Play elsewhere!

Of course, White should play elsewhere (tenuki). We can observe three classes of possible blunders here:

  • a doesn't change the status - it's nearly a move wasted, though it reduces Black's ko threats.
  • b makes seki, losing about 30 points of territory.
  • c is the worst, allowing Black to make life with Black a.


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