: ( 648aa)
White continues with the Main Semeai.

:
Black's push at the top does not hurt, as it is sente.

:
Finally, Black captures White's two stones in the lower left.

Black must not play any reduction.

Capture Variation:
At White's decision point, Black's large group in the upper right will have only six liberties left, five direct liberties (x), and one approach-move liberty ().

This is one liberty too few to survive the Punishment Semeai, where White does not play the oki at (after she captured the hanezeki's tail with , and Black recaptured at ), but occupies another liberty of Black's group, instead.

White will win the game by a large margin.