RTG Problem 27 / Solution

Solution  

occupies the vital 1-2 point, then pushes. After , Black finds that he is unable to prevent White from connecting the stone outside due to shortage of liberties.

Variation ( at , at )  

If makes a tiger shape, then , and kills.

Variation ( at )  

Connecting Black to attempt miai at and results in a squeeze.

No, at lives. If White captures at , Black recaptures. Instead, extend as above:

is a snapback  

If captures, at maintains the situation. If , then connects.

Variation at D18  

a and c are miai.

If at a then at c.

If at c then at a.

b and d are miai.

If at b then at d.

If at d then at b.