: ( 648qa)
White plays from below, also threatening to connect her single stone above.

:
Black connects Dany's Ko.

: (A 648qw)
White must connect her single stone immediately.

She must neither push with from above, nor occupy another one of Black's liberties at the right, e.g. with (which would result in a change in the order of moves).
She would lose two points overall.

:
White has to connect her three stones.

Otherwise, Black would capture, and gain four points in the Capture Variation.

:
Black must defend in the lower left corner, before reducing White's territory at the upper edge.
Please refer to the previous subvariation for details.

Black plays 1/1 reduction.

Capture Variation:

Compared to the superordinate variation ...

• Black got an additional point of territory in the left centre.
• Black captured an additional White stone in that area, so gaining one point.
• Black's cumulated gain in the lower left corner is one point.
• Black did not capture one White stone in the upper right, so losing two points.

In total, White lost one point.

White + 2 => White + 1

Semeai Variation:

Compared to the superordinate variation ...

• Black got an additional point of territory in the left centre.
• Black's cumulated gain in the lower left corner is one point.
• Black captured an additional White stone in that area, so gaining one point.
• The cumulated effect in the upper right is zero points.

In total, White lost three points.

White + 2 => Black + 1