: ( 512)

!!! We will show here, how far White is ahead in the semeai. !!!

White plays on a neutral point, which is equivalent to Black's group owning an additional liberty.

:
White's second move on a neutral point.

:

!!! White's third move on a neutral point, chosen for demonstrative purposes only. !!!

As a matter of course, after Black's atari with , White would capture Black's group with a move at .

:
Only if Black's large group in the upper right had three liberties more than it can really get in the problem's solution, Black could win the semeai in the hanezeki, and so the game by a very large margin.