BQM 347

. O X . . . X . O . |  

And it's a ko for life at worst.

(Of course, black can also try to kill by playing the 2-2 point, as white currently has no eyes. But this plan can certainly backfire if White somehow manages to live on the right side after Black cuts of the corner. So if your yose is good, one option might be simply responding to White's Move 101 by blocking off the right side.)