Beginner Exercise 79 / Solution

Sub-page of BeginnerExercise79
Black lives  

splice: B1 lives. The points a and b are miai for the second eye. If White connects at b, saving her single stone, Black plays a. Black needs to play the point to the right of B1 to make his second eye, but White cannot take it, because she has to connect her three-stone group (shortage of liberties). If White takes a, Black plays b, capturing the white stone and making a second eye.

This is too optimistic  

unkx80: Simply atari with B1 and B3, and making the second eye at B5 works too.

Ringo: What if white plays 2 at black 3? Doesn't that start a ko which Black needs to win in order to live?

Ringo is right. White will not be so cooperative as to play at W2 above. Living outright is better than ko. For that reason the atari at B1 is wrong. Admittedly, White must play at a before connecting the ko at B3. Still the possibility of play to kill Black is better for White than Black living outright. Through the ko, White should get some compensation elsewhere on the board.

White's proper response  

Andre Engels: No, B1 is correct. Black does not have to play the ko.

White's proper response  

Instead of capturing the ko, black plays atari at B3. If white connects at W4, black captures at B5, if white does not, black can capture at B4. Both lead to a living group.

Beginner Exercise 79 / Solution last edited by on November 12, 2015 - 17:16
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