: ( 648qh)
White utilises the wedge in the right centre as a ko threat.

We will assume here that White insists on winning the ko fight in the upper left corner.

:
White recaptures the ko.

:
Black gives White what she wants, and continues with the Main Semeai.

:
White connects the ko.

Black plays 3/4 reductions.

Capture Variation:

Compared to the superordinate variation ...

• White captured an additional Black stone in the upper left, so gaining one point.
• Black destroyed one point of White's territory at the upper edge.
• White did not capture Black's stone in the lower right, so losing two points.

In total, White lost two points.

White + 2 => Jigo

Semeai Variation:

Compared to the superordinate variation ...

• Black captured two White stones more in the upper left, but had lost one of his stones in this area, so the net effect is a gain of three points for him.
• White captured two Black stones more at the right, so gaining three points.

In total, gains and losses compensate for each other

Black + 2 => Black + 2