: ( 648es)
White continues with the Main Semeai, no longer fighting the ko in the left centre.

:
Black connects the ko.

Black plays 3/3 reductions.

Capture Variation:

Compared to the superordinate variation ...

• White did not capture one Black stone in the upper right corner, so losing one point.
• White did not destroy one point of Black's territory in the upper left corner.

In total, White lost two points.

White + 1 => Black + 1

Semeai Variation:

Compared to the superordinate variation ...

• White did not capture one Black stone in the upper right corner, so losing one point.
• Black captured one White stone less in the upper left, so losing one point.

In total, gains and losses compensate for each other.

Black + 1 => Black + 1