: ( 489)
White tries capturing Black's two stones.

, :
First, Black threatens to connect his stones to below.

:
This move is absolute sente, allowing Black to cut off White's entire left side.

:
White has no choice here. Any other move (after Black played at himself) would result in the hanezeki's tail getting - at least - two outside liberties, so enabling Black to resolve the hanezeki successfully, starting with a move at .

:
As usual, White cannot live on the left side alone.