: ( 58ab)
Black pushes at the top.

:
Thereafter, Black captures White's single stone at the upper edge.

:
White blocks immediately.

:
Black is able to connect.

:
White continues with the Main Semeai.

Black plays 1/1 reduction.

Capture Variation:

Compared to the superordinate variation, ...

• Black destroyed one point of White's territory at the top
• White got an additional point of territory at the upper edge.

In total, gains and losses compensate for each other.

White + 2 => White + 2

Semeai Variation:

Compared to the superordinate variation, ...

• Black destroyed one point of White's territory at the top
• White got an additional point of territory at the upper edge.

In total, gains and losses compensate for each other.

Black + 4 => Black + 4