Beginner Exercise 290 / Solution

Solution  

captures the marked stone, which makes the first eye and threatens to make two eyes on the left side. After connects the solitary white stone, makes a second eye around a.

Failure  

Although looks promising, it doesn't work. threatens to cut off the left side from the rest, so is forced. After , black can make only make one eye. White will destroy the other by playing at one of the a points.

Solution  

emeraldemon: I think this also works, making a and b miai.

White answers on the right  

When White destroys the eye on the right, secures enough room for two eyes. There is no killing shape and more than enough liberties.