Worst Move Problems / Example

Solution  

This is the solution. Now Black is alive, and there's no way for White to kill it.

Not the solution  

Although Black can play at 'a' to make life, but this is not the solution. White didn't make the black group alive; the status of the black group after is still unsettled.

Finally, of course, the usual rules of "alive with points" is better than "seki", which is better than "ko", etc, still applies here.