: ( 58bz)
White connects her two stones in the lower left.

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Black connects his two stones at the top.

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White attaches in the left centre, aiming at generating some points of territory there.

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It is best for Black to defend his eye shape in the left centre.

He would be worse two points overall, if he mistakenly played the atari at in the left centre, instead.

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White takes profit outside the Main Semeai area.

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Black captures White's single stone in the right centre.

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The Main Semeai continues.

Black plays 1/3 reductions.

Capture Variation:

Compared to the superordinate variation, ...

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

In total, gains and losses compensate for each other.

White + 2 => White + 2

Semeai Variation:

Compared to the superordinate variation, ...

• Black's cumulated gain in the upper left corner is one point.
• Black got an additional two points of territory in the left centre.
• White got an additional two points of territory in the left centre.
• Black captured one White stone less in the left centre, so losing two points.
• White captured one Black stone less in the lower right, so losing two points.
• White captured one Black stone more in the upper right corner, so gaining one point.

In total, gains and losses compensate for each other.

White + 2 => White + 2