Beginner Exercise 211 / Solution

Black lives  

is the vital point. Now a and b are miai for life.

Continuation 1  

If , lives with a bent four.

Continuation 2.  

If here, Black captures with ...

Nothing happens  

...White's throw-in is futile.

Bulky five  

If White is allowed to play (it really doesn't matter where Black plays first), then White almost fills with a bulky five and Black is dead.

Resulting shape  

After "Continuation 1" above, this shape results on the board. After , Black must defend inside - else White's cut at is atari and kills. The final territory is 3 vacant points + 4 prisoners = 7 points.