: ( 58dr)
Black defends in the left centre, also occupying a liberty of White's stones above.

:
White has to give atari at the nakade.

:
Black continues with the "usual" move in the upper left corner after White's earlier atari at his single stone at the bottom.

:
White connects her single stone in the right centre.

:
Black's push starts the reduction of White's territory at the top.

:
Black is able to connect.

:
The Main Semeai continues.

Black plays 1/1 reduction.

Capture Variation:

Compared to the superordinate variation, ...

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

In total, gains and losses compensate for each other.

White + 1 => White + 1

Semeai Variation:

Compared to the superordinate variation, ...

• Black captured one White stone at the upper edge, so gaining one point.
• Black destroyed one point of White's territory at the upper edge.
• Black captured one White stone less in the left centre, so losing two points.
• Black captured one White stone more in the lower left, so gaining two points.
• White captured one Black stone more in the upper right corner, so gaining one point.

In total, Black gained two points.

Black + 1 => Black + 3