Solution  

kills.

Since Black has c to cut or x to reduce White's space tramendously,

only at a or b will be considered.

c is mentioned here because bent four in the corner might worth something under some circumstances and rule sets.

Resistance 'a'

 

This exchange doesn't achieve much; the rest would be similar to the other two resisting attempts.

Resistance 'b'

 

Black has x or y next.

Resistance 'c'

 

After , White doesn't have enough space.

 

Ko.

 

For any other , the group is alive after .