GokyoShumyoSection4Problem18/Attempts

Attempt 1 (failure)  

If - - , then White achieves a ko as in the solution of Section 4 Problem 15 of this series.

Attempt 2  

What if Black extends to the 1-2 point?

Attempt 2 (variation 1)  

Black wins this way.

Attempt 2 (variation 2)  

Also, Black wins this way.