One Thousand and One Life-and-Death Problems / Problem 75 discussion

[Diagram]

Solution Diagram

This lives.

[Diagram]

Ko threats

White gets W1, W3, and W5 at one of the white+circle points; a total of three ko threats.

[Diagram]

Is this also a solution?

A question was raised: Is B1 also a solution? The answer is given below.

[Diagram]

Failure 1

This B1 fails. White plays W2 and the shape is dead. If at any time Black captures the four White stones with B3, then white+circle kills (Black cannot make two eyes due to damezumari).

[Diagram]

Failure 2

B1 looks fancy, but it fails because of the same reason (W4 at white+circle).


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