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

:
White pushes from above.

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

:
White connects the ko.

:
The Main Semeai continues.

Black plays 2/3 reductions.

If he played 3/3 recuctions, the final scores of both Main Variations would be interchanged.

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

Capture Variation:

Compared to the superordinate variation ...

• Black's cumulated gain in the upper left corner is one point.
• Black did not destroy three points of White's territory in the upper right.
• White did not capture Black's stone in the lower right, so losing two points.

In total, gains and losses compensate for each other.

White + 2 => White + 2

Semeai Variation:

Compared to the superordinate variation ...

• Black's cumulated gain in the upper left corner is one point.
• White captured three Black stones less in the upper right, so losing four points.
• White captured one Black stone more in the lower right, so gaining two points.
• Black captured one White stone less in the upper left, so losing two points.

In total, Black gained one point.

White + 2 => Black + 1