: ( 548k)
Black's atari seems to be a strong answer to White's crosscut.
White's single stones in the top left corner look weak, but nevertheless Black will be unable to gain decisively in the following sequences.

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This atari looks like White's natural continuation.

(A 548kea):
Black captures with , and enters what might look a "peaceful" sequence.

He might want to answer more forcefully by solidly connecting with , but he will be unable to win the ko fights that erase thereafter.

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Black connects, allowing White to also lead all her single stones in the corner to the outside.

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Black must not block at , instead.
White would throw-in at and capture some of Black's stones in the corner, so winning the game by a large margin.

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Black's connection if forced.

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Playing any further in the top left corner costs White Main Semeai Liberties; therefore, she would not gain from doing so.

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As usual, Black plays elsewhere after White's atari at the lower edge.

...

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White's hane preempts a Black move at the same point. Eventually, Black will have to connect at .

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Black does not connect with .

If he did, the final scores would become Jigo / White + 4.

If Black played an one-point forcing move of e.g. , instead, the final scores would change to W + 1 / W + 3.

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White will not gain by playing or in the left centre.

Capture Variation:

Compared to the superordinate variation, ...

• Black's cumulated loss in the upper left corner is four points.
• Black gained four points by capturing White's two stones in the lower left.
• Black gained one point of territory in the left centre.
• White gained two points by capturing Black's stone in the lower right.

In total, Black lost one point.

White + 1 => White + 2

Semeai Variation:

Compared to the superordinate variation, ...

• Black's cumulated loss in the upper left corner is four points.
• Black gained two points by capturing an additional White stone at the left edge.
• Black gained one point of territory in the left centre.
• Black lost two points by capturing White's two stones in the lower left.
• White lost two points by capturing Black's stone in the lower right.

In total, Black lost one point.

White + 1 => White + 2