: ( 648dp)
Black pushes in the upper right corner.

Please note that this ko threat loses one Main Semeai Liberty.

Ko: ; ;

:
This is Black's second (and last) ko threat that loses a tempo in the Main Semeai.

:
Black recaptures the ko for the last time.
However, due to the liberty count in the Main Semeai, he will be unable to connect this ko at .

:
The Main Semeai continues.

:
Sooner or later, White will get the opportunity to give atari at Black's stones above by recapturing the ko in the left centre.

:
Black has to connect.

Black must not play any reduction.

White will connect at after her decision point.

Capture Variation:

Compared to the superordinate variation ...

• Black did not capture one White stone in the left centre, so losing one point.
• Black did not get any territory in the left centre, so losing one point.
• Black destroyed an additional two points of White's territory in the upper right.

In total, gains and losses compensate for each other.

Black + 4 => Black + 4

Semeai Variation:

Compared to the superordinate variation ...

• Black did not capture one White stone in the left centre, so losing one point.
• Black did not get any territory in the left centre, so losing one point.
• White captured an additional two Black stones in the upper right, so gaining two points.

In total, Black lost four points.

White + 2 => White + 6