Construction Problem 8

The world needs more construction problems. Here's one. --Bass

Repetitive things happen at the 1-2-point

Construct a "black to play and live" problem, where the solution very thoroughly is "black plays A2".

That is to say:

• There is only one way for black to live: black plays A2.
• If white resists, black has only one response: black plays A2.
• If white still resists, the tesuji to save the day is: black plays A2.

Bonus points for making the problem as small and clear as possible.

/Attempts /Solution?