: ( 432)
This move threatens Black's two stones below more than the corner territory above.

: (86 484; A 485)
White further reduces Black's top left corner. It is too slow to play on the left side immediately. However, even a move at , to reduce Black's territory in the corner, will not help White.

:
It is decisive that White will be unable to capture Black's stones on the left side.

So, Black will win by more than ten points.