: ( 58dc)
White defends her territory in the upper right corner in sente by giving atari at Black's three stones.

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Black has to connect.

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White starts the reduction of Black's territory in the upper left corner, ending in sente there.

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Thereafter, she destroys Black's potential territory in the left centre.

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Please note that White ends in gote here.

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Now, it is Black who reduces White's potential territory in the upper right.

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White blocks immediately,

If she pushed at , instead, Black would push once more with , threatening to destroy even more.
Please note that a White move at is played into a dead end.

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White limits Black's actions at the top.

If she played at , instead, Black would jump to at the upper edge.

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White blocks immediately.

If she pushed at , instead, Black would push once more at .

Black plays 2/2 reductions.

Capture Variation:

Compared to the superordinate variation, ...

• White destroyed two points of Black's territory in the upper left corner
• Black destroyed three points of White's territory at the top.
• Black did not destroy one point of White's territory in the upper right corner.

In total, gains and losses compensate for each other.

White + 1 => White + 1

Semeai Variation:

Compared to the superordinate variation, ...

• Black captured two White stones more in the upper left, so gaining two points.
• White captured three Black stones more at the top, so gaining three points.
• White captured one Black stone less in the upper right corner, so losing one point.

In total, gains and losses compensate for each other.

White + 1 => White + 1