KyuExercise215/Attempts

Basic check  

The basic approach is to enlarge (Black) and reduce (White) the eyespace. White kills in this approach.

Ko  

Black can get a ko out of this variation.

Die/Ko  

By turning, Black can't enlarge the eye space enough. If He switches for , it'll be ko again.

Not good  

Playing here is a bad idea. This is just one straightforward refutation.

Reversed order  

This reverts to the first attempt

Best candidate  

Reducing eyespace no longer works for White.

(I added the marked stone so that capturing at A is not sente)