HowToApproachALifeAndDeathProblem/ExampleSolution

First: reduce space  

Since the group is already sealed in, we first think about reducing the eyespace. If , then reduces White to a door group which is dead.

Next: cut  

White's obvious counter measure is to expand her eyespace by blocking at . Next, cuts her stones apart. maintains the cut and Black's stones will suffer from shortage of liberties on either side.

Final solution  

One possible continutation: Black has insufficient outside liberties to capture the cutting stones.

Borrowed from Dieter Verhofstadt/Why Fundamentals Matter, where you can find the failed attempts.