Beginner Exercise 68 / Solution

Black first to kill  

lavalyn adds some more diagrams

4 not at 5  

Shortage of liberties.

Black 1 prevents the second eye  

Jacob4Jesus: After only a and b matter. They are miai to kill. N o matter what W does should play on one of these. After white is dead and may be played elsewhere. (Except the first diagram case)

B to move  

Taking the position one move back like this also results in a single correct move, leading to the discussion above.

B to move  

Or even like this.