Beginner Exercise 221 / Solution

Solution.  

I think as shown by the attempts, this is the solution. If black wants an eye he must play . follows naturally.

There are the following continuations:

Solution.  

Black cannot play a because white captures by a snapback.

How does white stop two eyes? at  

baerrach: I can't see how to stop black making two eyes. Now second eye at a.

Superdave: White would play 2 at .