: ( 648ew)
White captures Black's just played stone.

Ko: ; ; ; ; ; ;

:
Black has this atari as a ko threat at the upper edge.

:
The remaining ko fight follows the course of the superordinate variation.

Ko: ;

; :
On the board, Black does not have any valid ko threats left.

However, we still have to compensate for our earlier mistake that is mentioned in the superordinate variation, counting White's atari in the upper left centre as an additional ko threat.
Please assume this exchange as replacement for Black's kikashi , in the lower left, which has been played too early by us, too.

:
Black recaptures the ko for the last time.

:
White does not have any valid ko threats left, and so continues with the Main Semeai.

:
Black connects the ko.

Black plays 1/1 reduction.

Capture Variation:

Compared to the superordinate variation ...

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

In total, gains and losses compensate for each other.

White + 1 => White + 1

Semeai Variation:

Compared to the superordinate variation ...

• White captures an additional Black stone at the upper edge, so gaining one point.
• White captured an additional Black stone at the upper edge, so gaining one point.
• White captured one Black stones less at the top, so losing two points.

In total, gains and losses compensate for each other.

Black + 1 => Black + 1