Beginner Exercise 123 / Solution

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Unsettled. White playing first can live. Black playing first can kill.

[Diagram]

Black first

B1 is killing: W2 prevents the connection, but then B3 is atari.

[Diagram]

Black first variant?

What about this alternative for Black first? It seems to leave Black in a stronger position (though perhaps insignificantly so).

Moosky: This doesn't work. White would play W2 at B3, creating a ko. You should always avoid ko if you have a sure way to kill. (The diagram at the bottom of the page shows this).

[Diagram]

White first

White must play a or b to live, At a is better, by 3 points, than b.

[Diagram]

White first at b

Kaiou: wow, my first page :)

unkx80: Excellent, you are right! =)

[Diagram]

Wrong

There is a small trap in this problem. Definitely the ko created by B1 and B3 below is not the solution.



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