The double snapback is the move. In this problem, any reordering of the moves will fail.
makes miai of a and b.
Tapir: Sure white loses stones, but is alive after . He doesn't need to approach / but can capture them directly. No? But the loss is bigger than simply at , Black has to take the corner, white ends with 5 points territory, black has gained ten points in the corner (deiri afaic).
unkx80: I suspect the best play is simply to leave it alone after . Later, White a - Black b, White c - Black d are sente. Exactly like what you said, and I agree that the swing is 10 points.