RTG Problem 13 / Solution

Solution  

The key is the descent at . ( at a, Black b and at also works.)

Main line  

If , the sequence of to is a fairly standard way of killing. Black dies of a bulky five.

Variation  

tries to expand the eyespace but onwards kill.

Variation  

If makes a diagonal move, can squeeze. does not work here because and can turn the other eye into a false eye.

Failure

Failure  

This is a seki.

Failure  

This lives too. But is an important move.

Failure  

The jump of is too fanciful. captures and lives.