Beginner Exercise 226 / Solution

Analysis.  

A simple analysis to make is that if we add the four stones, then the shape becomes a crossed five, with a being the vital point.

Solution.  

So makes a play on the point of symmetry. If is played anywhere else, White at kills.

Solution.  

Later, and are miai, and and are miai.

Solution.  

And and are miai as well. So all the B2 bombers are saved!