Kyu Exercise 73 / Solution

Solution  

The solution is . This makes a and b miai.

Solution  

If descends, then can make the second eye on the left side. The eye on the right side is unaffected.

Similarly, if at a, then the same makes two eyes and lives.

Failure

Failure  

here is a mistake, because after , Black is unable to play at to make a second eye due to shortage of liberties. The result is a ko for life.

Note that is the only correct move after , any other move dies.

Failure  

If here, then crawls in. After , Black dies because a move at a is self-atari.