DoubleSnapback/attempts1

Problem 1  

Perhaps this is rather obvious since title is double snapback, and perhaps that's why there's no attempts links yet on this page but:

So here white can't play at a because while he takes black 1, black takes back at 1 and white can't play at b because, again, while he takes black 3, black takes back at 3. White 2 at a, black takes at 2. White 2 at b, black takes at 3. White 2 at 3 and black can leisurely play black 3 at a. He can then either capture at black 2, or if white connects at 2, capture at b.

Chew: And if white plays 2 at 3, black plays 'a'. White dies because it has too few liberties to play anywhere.