Snapback Problem 15 / Solution

Black does not need to defend  

Even if White has filled up all the outside liberties, there is no need for Black to defend against the double atari at a.

Illustration  

If double atari, then connects. When captures two black stones...

The snapback  

.. is the snapback.

Now the territory count: When we cancel out White's two dead stones against Black's two prisoners, we get back 5 points.