xela: The best continuation I can find is and , threatening to capture white's centre group. Then makes ko.
If white tries to avoid the ko by playing , then causes a shortage of liberties that makes possible.
(If white plays at , then at , white a, black b.)
LukeNine45: at leaves two ways to make another eye, no?
xela: Um, (looks sheepish), yes.
If black tries and in the reverse order, white can defend at then connect with the tesuji at .
xela: I keep oscillating between "look, black can make a ko this way!" and "no, white is alive, why did black resign?"