Gokyo Shumyo, Section 2, Problem 12 / Attempts

 

unkx80: What if here? If blocks, then seems to live.

 

Therefore, I thought the solution might be . If here, then kills. If at a, then at , which reverts to the earlier variations.

Variation  

Bill: As always, unkx80 is right. (I peeked.) Here is another variation.