: ( 1863)
Black plays Harry's Hasami-Tsuke without the preparatory push into White's corner before.

We inserted this move manually.

:
White prevents her pinched stone from being captured.

:
Black continues with a "late" push".

: ( 87 1869)
White's hane at the upper edge seems to be disadvantageous (with regard to the likely final result provided), but is favoured by KataGo here.

If the reverse komi is too small, KataGo does not seen to calculate the capture of the hanezeki's tail correct, and so thinks that White is behind.

White's block at , instead, would revert to the "straightforward" sequence of the main line (that started with Black's push).

: ( 90 1870)
Black plays my Guzumi.

If would have been better for Black (assuming correct continuation by White) to connect his pivotal hasami-tsuke stone with , instead.

:
Black has fallen below the Punishment Semeai Liberty Level, and therefore has to secure independent life for his large group in the upper right.

:
White captures Black's single stone at the upper edge in return.

:
Black continues with the Nakade Sequence at the left edge, making sure that White will have to capture the hanazeki's tail.

:
In between, Black peeps in the upper right centre, forcing White to connect at .

Please note that Black's move would be gote, if White had already captured the hanezeki's tail.

:
Black gives atari at White's two stones in the lower left.

: ( A 1871)
White's jump down to the second line starts one of KataGo's surprising attacks at Black's upper left corner from the inside.

However, with a larger reverse komi, KataGo let White connect the atari in the lower left with a move at , which led to a better score for her - but only after some manual adjustments.
It seems that KataGo had not sufficiently explored this part of the variation tree, and now - during "play" alone - cannot calculate far enough. Handicapped by its event horizon, KataGo is apparently looking for some desperate measures.
KataGo's preference for the early capturing of the hanezeki's tail -- probably a relic from his area scoring days - may also play a crucial role here.

:
White sets the scene for a ko-fight in the upper left corner.

:
Black creates a sure eye at the top.

:
Black strengthens his formation in the left centre, so erasing potential White ko-threats in this area.

:
White benefits by connecting her two stones in the lower left.

Ko: ; ; ; ;

:
Finally, Black starts the ko-fight in his upper left corner.

Ko: ; ; ; ;

...

Ko: ;

: ( 171 1876)
Black's move at the lower edge aims at reducing White's bottom group to only one eye.

However, White is forced to capture the hanezeki's tail later in the game anyway (due to her one-eyed group at the left side alone), so she will not answer Black's fake ko-threat.
Black just lost one point overall unnecessarily.

He should have erased a potential White ko-threat, at least.

: (A 1877)
As explained above, White does not answer Black's previous move locally.

Even if she did, the final score would remain unaffected.
However, both sides would be given the opportunity to make mistakes.

: (B 1880)
White must capture the hanezeki's tail just now.

She would lose the game, if she continues with fighting the ko in the upper left corner.

:
Black recaptures, of course.

...

Ko: ; ;

:
The ko-fight continues.

Ko:

...

Ko:

...

...

:
White connects the ko, creating a seki in the upper left corner.

:
Black captures one White stone in the seki for additional profit.

Capture Variation:

Compared to the superordinate variation, ...

• White's cumulated gain in the upper left corner is 13 points.
• Black's cumulated gain at the top is four points.
• Black's cumulated gain in the upper right corner is seven points.
• Black destroyed two points of White's territory in the right centre.
• Black got two additional points of territory in the hanezeki area.
• White did not capture Black's stone in the lower right, so losing two points.
• White got one point of territory at the bottom.
• Black's cumulated gain in the lower left corner is one point.
• Black did not capture White's two stones in the lower left, so losing four points.
• White did not capture one Black stone in the left centre, so losing one point.
• Black did not capture one White stone in the left centre, so losing one point.
• Black's cumulated gain in the nakade is four points.

In total, Black gained four points.

White + 5 => White + 1