: ( 648ab)
White's central attachment is played here without any preparatory measures above.

:
Black's tesuji of sacrificing one stone serves connecting his stones, while creating an eye above.

:
Black connects, also giving atari at White's single stone.

:
White pushes from above here.

She might also do without, and connect at immediately, without affecting the final scores.

:
White connects her single stone at the upper edge.

:
Black plays his kikashi in the hanezeki "early".

However, we now know that White does not want to pre-empt this move.

If she mistakenly did, she would not change the overall result, but become unable to capture Black's large group at the right in the Semeai Variation.

:
Black gives atari in the lower left.

:
White connects her two stones, refuting Dany's Sacrifice.

: (A 648ak)
Black must capture the ko.

If he didn't touch the ko, White would do so, too. Black's score in the Semeai Variation would become worse.

:
White continues with the Main Semeai.

It does not make sense for her to fight the ko in the left centre, as she will be unable to connect it.
Please refer to the subvariation above for details.

Black plays 2/2 reductions.

Capture Variation:

Compared to the superordinate variation ...

• White's cumulated gain at the upper edge is two points.
• Black did not capture one White stone in the left centre, so losing one point.
• Black's cumulated gain in the lower left corner is two points.
• White did not capture Black's stone in the lower right, so losing two points.

In total, White lost one point.

White + 2 => White + 1

Semeai Variation:

Compared to the superordinate variation ...

• White's cumulated gain at the upper edge is two points.
• Black did not capture one White stone in the left centre, so losing one point.
• Black's cumulated gain in the lower left corner is two points.
• White captured an additional Black stone in the lower right, so gaining two points.
• Black captured an additional White stone in the left centre, but one White stone less in the lower left corner, so the net effect is zero.

In total, White gained three points.

Black + 4=> Black + 1