Solution
White has two atari possibilities at a and b. makes a shape of rotational symmetry, keeping atari options open.
White connects
Against here, White uses option a. Black can't connect at for shortage of liberties.
Connects similarly
And against here, White uses option b. Similarly, Black can't connect at for shortage of liberties.
Failure
Using atari first fails. a and b are miai for Black to cut.
Sub-pages (up)Hint
Referenced byBeginnerExercise171