Beginner Exercise 208 / Solution

Black lives  

Descending at is the correct solution. a and b are miai for life.

White attacks  

If tries to remove the eye, then and captures three stones and makes the eye.

continued  

a and b are miai for the second eye.

White defends  

If connects, lives. This should be what is played in real games.

Failure ( at marked stone)  

If , then destroys the eye. Capturing at only allows to kill by a throw-in that leads to a false eye. at is killed in a similar way.