Beginner Exercise 135 / Solution

Failure.  

The descent at fails, because after , if black tries to atari at a, white b will capture all the black stones.

Opportunity

Opportunity.  

Recognizing that the way to deal with this situation is to create a ko.

Note that cannot avoid the ko by playing at . However, white takes the ko first at a.

Solution

Solution.  

At the same time, playing that ko differently can make it more or less advantageous for the player.

The solution is to throw-in at first, followed by .

Solution.  

This time round, takes the ko first.