Ko:

: ( 442)
This move leads to ko, too.

Ko:

:
Now it is a double-ko that Black cannot win.

:
Black gets the left side, but will be unable to win. White is approximately 15 points ahead, and wins easily. In contrast to what will be shown later ( 906), concerning the capture of White's group on the left edge, White doesn't need to capture Black's centre group here.