RTG Problem 15 / Solution

Black first to live  

makes miai of a and b for one eye in gote, but first Black makes the - exchange. To answer your level question, it took me an instant to a few seconds to figure this out. --Dieter

Bob McGuigan: I don't think is the best try for White. What does Black do if is one space to the left?

Variation  

Dieter: I admit that this is a little harder. Black 11 at a.