: ( 648kx)
White continues with the Main Semeai, occupying one of Black's liberties at the right.

:
Black's connection is a quite surprising, but effective, move, which threatens to create two points of territory by continuing with .

: (148 648kz)
Giving atari with is best for White.

Black would gain in the Capture Variation, if she continued with the Main Semeai, instead.

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The Main Semeai continues.

Black must not play any reduction.

Capture Variation:

Compared to the superordinate variation, there are no changes.

Black + 1 => Black + 1

Semeai Variation:

Compared to the superordinate variation, Black captured an additional White stone in the upper left centre, so White lost two points.

White + 1 => Black + 1