: ( 648qc)
Black connects in the upper right.

:
White pushes from above.

:
Black simplifies the matter by capturing White's stone below immediately.

White is still ahead in valid ko threat, so it would not make any sense to continue with the ko fight in the left centre.

:
White connects the ko.

:
The Main Semeai continues.

Black plays 1/1 reduction.

Before the end of the game, Black will have to capture at .

Capture Variation:

Compared to the superordinate variation, there are no changes.

White + 2 => White + 2

Semeai Variation:

Compared to the superordinate variation, there are no changes.

White + 2 => White + 2