WorstMoveProblem17/Attempts

Giving black a chance to live  

ThorAvaTahr: I guess this oughta do it ;)

tapir: this is correct.

Black lives with one move  

now black can live with one move, as with cannot play a due to suicide.

MrTenuki: Even if suicide were allowed, a would only be a ko threat at best. No other achieves this, so the correct move stays the same regardless of the ruleset.