Kyu Exercise 121 / Solution

Sub-page of KyuExercise121

The placement at white+circle is a vital point, making miai of a and b, therefore White is guaranteed to capture either the single Black stone at the left side or the two Black stone on the right side.

It should be obvious that if White gets to play first, either White at a or b kills. However, if Black first, Black still can save his main group. However, the asymmetry in this problem is an important feature.

Black first: Solution  

If Black plays first, the solution is to connect on the right side with B1, and then descend with B3. Should W4 destroys the eye at the bottom, B5 captures the two White stone chain including W2.

Black first: Failure  

Connecting at the left side results in failure, because the extra exchange of black+circle and white+circle actually decreased Black's liberties, rendering B7 ineffective. It is also not possible for B7 to try to live by under the stones technique by playing at a, because W8 at B7 is sufficient to kill.

Kyu Exercise 121 / Solution last edited by Unkx80 on May 23, 2009 - 15:26
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