: ( 648fs)
Black plays atari in the hanezeki.

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Black ends in gote at the right.

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White continues with the Main Semeai.

Please be aware that Black does not have even a single Main Semeai Liberty to spend.

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We will visualise the consequences by starting with Black moves in the left centre.

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Capturing the nakade is necessary, but does not have any additional effect here.

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White gives atari at Black's stones above.

"Usually", the following sequence would be played later in the game, after (Capture Variation) or just at (Semeai Variation) White's decision point.

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This move is sente, threatening to gain some additional points in the left centre.

; :
The regions at the upper edge, and in the left centre, are miai.
Connecting at the upper edge simplifies the presentation a bit.

Black must not play any reduction.

Capture Variation:

Compared to the superordinate variation ...

• Black did not get one point of territory in the left centre, so losing one point.

Jigo => White + 1

Semeai Variation:

Compared to the superordinate variation ...

• Black did not get one point of territory in the left centre, so losing one point.
• White did not get one point of territory in the hanezeki.

In total, gains and losses compensate for each other.

White + 3 => White + 3