(Referenced by 648cm)

: ( 648aa)
Black connects in the left centre, simultaneously occupying one liberty of White's large group at the left.

:
White occupies a liberty of Black's stones in the top left centre.
This dual-purpose move was found by Joachim. It defends White's just played stone below, and it threatens a snap-back after , , , . Therefore, White keeps sente.

:
Black has to connect, in order to protect against White's threat.

; :
White plays her kikashi in the lower left corner.
She also ends in sente here, as Black does not have any chance to create an eye in the left centre.

:
White's connection at the upper edge is large.

:
Black pushes at the top.

:
Black gives atari at White's two stones in the lower right.

:
White connects, refusing Dany's Sacrifice.

:
The Main Semeai continues.

Black is unable to get any territory in the left centre. If he threatens with , for example, White will answer at , threatening to cut with . After Black defended against this threat, she can connect her single stone with .

Black plays 3/5 reductions.

Black will capture at before the end of the game.

Capture Variation:

Compared to the superordinate variation ...

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

In total, White gained one point.

White + 2 => White + 3

Semeai Variation:

At White's decision point, Black's large group in the upper right will have nine liberties, eight direct ones (), and one approach-move liberty ().
White on her side will suffer from the final ko in the upper right centre - found by Joachim ( 648ag) - that depends on the existence of two White cutting points in the centre (), and Black's large ko threat at at the top.
Black's large group in the upper right will not survive the semeai, but Black will capture White's wC-stones in the upper left, and win by about 15 points.

Black will win the game by a large margin.