Gokyo Shumyo, Section 4, Problem 65 / Attempts

first, flawed attempt (refutation below)  

xela: The move order is important...

Black to win the capturing race  

unkx80: The move order is important... ;P

second attempt  

xela: Speaking of move order, it's still important to play before , right?

unkx80: Yes.

Refutation  

Instead, I think the immediate descent is the correct answer.