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

Black is four Main Semeai Liberties over par.

Ko: ; ; ;

:
Black recaptures the ko.

:
Black's ko threat loses one tempo in the Main Semeai. Black is back at three over par.

Ko: ; ; ; ; ; ; ;

:
White captures Black's single stone at the top.

It will not make a difference, if she captured at , instead. Thereafter, Black would have the atari at as a ko threat.

; :
Please understand these two moves as replacement for White's kikashi , in the centre, which had been played too early by us.

We now know that White's atari in the upper left centre cannot be counted as an additional ko threat.

; ; :
These ko threats cost one tempo in the Main Semeai each. Eventually, Black is two over par.

:
Black does not have any valid ko threat left, so he connects in the centre.

Joachim found that Black's throw-in at in the upper right would have been a valid ko threat.

White is barely ahead in ko threats (2 x vs. ) before this move, so our earlier mistake with White's atari in the upper left centre will not affect the final scores of this subvariation.

:
White has to connect the ko.

:
The Main Semeai continues.

Black plays 1/2 reductions.

Before the end of the game, Black will capture at .

Capture Variation:

Compared to the superordinate variation ...

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

In total, White gained one point.

White + 1 => White + 2

Semeai Variation:

Compared to the superordinate variation ...

• White's cumulated gain at the upper edge is two points.
• White lost one point of territory at the too.
• White captured an additional two Black stones in the upper right, so gaining two points.
• White captured one Black stone less in the lower right, so losing two points.

In total, White gained one point.

White + 1 => White + 2