: ( 648qc)
Black connects in the upper right.

:
White pushes from above.

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Black simplifies the matter by immediately capturing White's stone below.

:
White connects the ko in the left centre.

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The Main Semeai continues.

Black plays 2/3 reductions.

If he played 3/3 reductions, the score of both Main Varations would be interchanged.

Before the end of the game, Black will have to capture at .

Capture Variation:

Compared to the superordinate variation ...

• Black did not destroy two points of White's territory in the upper right.
• White did not capture Black's stone in the lower right, so losing two points.

In total, gains and losses compensate for each other.

White + 2 => White + 2

Semeai Variation:

Compared to the superordinate variation ...

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

In total, Black gained one point.

White + 2 => White + 1