Beginner Exercise 123 / Solution

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

Black first  

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

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).

White first  

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

White first at b  

Kaiou: wow, my first page :)

unkx80: Excellent, you are right! =)


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

Beginner Exercise 123 / Solution last edited by on June 22, 2016 - 18:18
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