: ( 648db)
White blocks at the top, stopping Black from playing his kikashi there.

: (A 648dn)
Black captures White's single stone at the upper edge.

Simply connecting the ko in the centre, instead, will be a grave mistake.

:
White inserts her kikashi in the hanezeki.

:
White recaptures the ko in the left centre.

Blocking at , instead, will be worse for her.

:
Black keeps things simple by capturing in the lower left.

:
White connects the ko.

:
Black plays another push at the upper edge.

:
The Main Semeai continues.

Black plays 0/1 reduction.

Capture Variation:

Compared to the superordinate variation ...

• Black's cumulated gain at the upper edge is three points.
• White got an additional point of territory at the top.
• Black did not capture one White stone in the left centre, so losing one point.
• Black did not get any territory there, so losing one point.

In total, gains and losses compensate for each other.

Black + 4 => Black + 4

Semeai Variation:

Compared to the superordinate variation ...

• Black's cumulated gain at the upper edge is three points.
• White got an additional point of territory at the top.
• Black did not capture one White stone in the left centre, so losing one point.
• Black did not get any territory there, so losing one point.

In total, gains and losses compensate for each other.

White + 2 => White + 2