: ( 648nz)
White connects the ko in the centre, but this move comes too early.

:
Black pushes at the upper edge.

:
White blocks immediately.

She might also wait with this move until after her decision point.

:
Black is able to connect.

Black must not play any reduction.

Black will capture at before the end of the game.

Capture Variation:

Compared to the superordinate variation ...

• Black destroyed an additional point of White's territory at the upper edge.
• Black did not destroy one point of White's territory at the top.

In total, gains and losses compensate for each other.

White + 1 => White + 1

Semeai Variation:

Compared to the superordinate variation ...

• Black destroyed an additional point of White's territory at the upper edge.
• White captures one Black stone less in the upper right, so losing one point.

In total, Black gained two points.

White + 1 => Black +1