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White blocks at the top, stopping Black from reducing her territory there in sente.

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Black captures White's single stone in the right centre, which is surprisingly large.

Black does not only achieve two points for White's captured stone, but also another one for destroying White's potential territory at (both with respect to the Capture Variation).
Disadvantage is the loss of two tempi in the Main Semeai. However, will become an eye, so Black's large group gets another approach-move liberty at in the hasami-tsuke area.
Three points at the cost of only one Main Semeai Liberty mean a net gain of two points.

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White's wedge is sente.

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Black gives atari from above, so immobilising White's stone below.

This move has been found by Joachim, it gains one tempo in the Main Semeai, compared to .

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White takes profit outside the Main Semeai Area.

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The Main Semeai continues.

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Black plays 2/3 reductions only.

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Black follows White with the Main Semeai.

If he mistakenly destroyed another point of White's territory (for the Capture Variation), instead, he would lose the Semeai Variation by two points.

Capture Variation:

Compared to the superordinate variation, ...

• White's cumulated gain at the upper edge is three points.
• White got an additional point of territory at the top.
• Black captured White's single stone in the right centre, so gaining two points.
• Black destroyed one point of White's territory there.
• White did not capture Black's stone in the lower right, so losing two points.

In total, White lost one point.

White + 2 => White + 1

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