: ( 648qa)
Black enlages his territory in the right centre, pre-empting White's wedge here.

:
White inserts her kikashi in the lower left corner, ...

:
... before connecting the ko in the left centre.

Pushing at , instead, would be a grave mistake, losing one point overall.

:
Black maximises his territory in the right centre.

Black plays 0/2 reductions.

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

Please note that Black's large group has twointernal liberties. Therefore, there is no need to take White's upper string in the hanezeki off the board, one liberty-occupying move at is sufficient here.

Capture Variation:

Compared to the superordinate variation, ...

• White got an additional point of territory at the upper edge.
• Black gained an additional two points of territory in the right centre.
• Black gained an additional point of territory in the hanezeki.

In total, Black gained two points.

White + 2 => Jigo

Semeai Variation:

Compared to the superordinate variation, ...

• White got an additional point of territory at the upper edge.
• White captured one Black stone less at the upper edge, but one more in the right centre, so the net effect is zero.
• Black destroyed one point of White's territory in the right centre.

In total, gains and losses compensate for each other.

White + 2 => White + 2