Black first to live
is the key. White has no choice but to connect at . Then, gets the second eye because of the cutting point at a.
White can't destroy the eye
With the sequence up to , Black captures White's group.
alive
So, White must connect and Black then ensures life.
zinger: Objectively, white will just tenuki with .
Sub-pages (up)Attempts
Referenced byBeginnerExercise88