: ( 2043f)
Black descends to the upper edge, strengthening his formation in the upper left corner.

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White's early atari is not necessary here, as her two stones to the left will not be capture later.

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The Main Semeai continues.

Black must not play any reduction.

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After her decision point, White will give atari in the left centre.

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Black has to connect.

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Black connects.

Please note that Black must not play at , instead, as would become an atari.

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White establishes two points of territory in the left centre.

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Black destroys one point of White's territory at the upper edge in return.

Capture Variation:

Compared to the superordinate variation, ...

• Black got an additional two points of territory at the upper edge.
• Black destroyed one point of White's territory in this area.
• White got an additional two points of territory in the left centre.
• White destroyed one point of Black's territory in this area.

In total, gains and losses compensate for each other.

White + 1 => White + 1

Semeai Variation:

Compared to the superordinate variation, ...

• Black got an additional two points of territory at the upper edge.
• Black destroyed one point of White's territory in this area.
• White got an additional two points of territory in the left centre.
• White destroyed one point of Black's territory in this area.

In total, gains and losses compensate for each other.

Black + 1 => Black + 1

2043f