: ( 58bc)
White connects her single stone in the right centre.

: ( 136 58bn)
Black's reinforcement of his upper left corner is played too early here, and so a grave mistake.

I simply overlooked that Black can defend his corner even after a White attacking move at the left or upper edges.

Black must defend in the left centre, instead.

:
White pushes at the left edge, reducing Black's corner territory from below.

:
Black descends to the upper edge, taking some profit there.

:
Whtite plays KataGo' bad-shape move in the left centre.

:
Black answers with the solid connection.

:
The Main Semeai continues.

Black must not play any reduction.

After her decision point, White will block at at the upper edge.

Capture Variation:

Compared to the super²ordinate variation, ...

• Black's cumulated gain in the upper left corner is two points.
• Black did not capture a White stone in the left centre, so losing two points.
• White got an additional point of territory in the right centre.

In total, White gained one point.

White + 1 => White + 2

Semeai Variation:

Compared to the super²ordinate variation, ...

• Black's cumulated gain in the upper left corner is two points.
• Black did not capture a White stone in the left centre, so losing two points.
• White got an additional point of territory in the right centre.
• White captured one Black stone less in the right centre, so losing two points.

In total, White lost one point.

Black + 7 => Black + 8