: ( 648cx)
White connects her single stone at the upper edge.

Ko:

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Black recaptures the ko, continuing with the ko fight for a few moves.

Defending his lower left corner with , instead, would be too early, as White would gain decisively by also blocking with at the top.

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In order to simplify the presentation, we play Black's push at the top first as a ko threat, before his atari in the hanezeki.

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White is bound to answer locally.

If she inserted her kikashi at , instead, she would lose her ko threat at . Therefore, Black would win the ko fight in the centre, as well as the Semeai Variation, again.

:
Black plays his kikashi in the hanezeki, not continuing with Dany's Ko.

White is barely ahead in ko threats (6 x , vs. , 4 x , ), so Black will lose the ko fight anyway.

Please note that fighting the ko until the very end would imply that Black played his disadvantageous ko threat at , which cost him one point overall.

:
Black continues with the Main Semeai, also defending his lower left corner.

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White has to connect the ko in the left centre - sooner or later.

:
Black continues with the Main Semeai.

Black plays 2/3 reductions.

Capture Variation:

Compared to the superordinate variation ...

• White's cumulated gain at the upper edge is two points.
• Black destroyed one point of White's territory at the top.
• Black's cumulated gain in the lower left corner is two points.
• Black did not destroy 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 ...

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

In total, gains and losses compensate for each other.

White + 1 => White + 1