: ( 2043a)
White occupies one of Black's Main Semeai too many, given the still untouched upper left corner.

We inserted this move manually.

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Black solidifies the lower border of his upper left corner.

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Yamada Shinji's Tsuke comes too late now.

: ( A 2043d)
With a komi of 1, KataGo plays its Immediate Crosscut as a desparate measure.

With a higher komi, KataGo chooses the correct continuation by drawing back to , instead.
And has a big surprise up his sleeve!

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Black gives atari at White's stone on the outside, punishing White for her mistake.

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Black is able to connect on the outside.

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White plays another atari in the corner.

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Black captures White's pivotal stone.

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White connects her cutting point in the corner.

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Black's attachment successfully immobilises White's stones in his corner.

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KataGo captures the nakade "early" here.

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The fight in the upper left corner continues.

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White tries to increase her liberties.

Alternatively, White might consider playing the hane of , but which will not lead to success either, due to Black's solid wall below.

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But Black secures an eye for his stones at the top.

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White's hane stops Black from creating another eye at the upper edge.

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Black takes another liberty of White's stones in the corner, and will win the semeai by one move.

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White's hasami-tsuke starts the endgame in the lower left corner.

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White's last move was no absolute sente, so Black takes the opportunity to insert his kikashi in the hanezeki.

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KataGo found this surprising extension inside Black's corner.

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Black must answer very patiently.

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White gives atari from the inside.

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Black is forced to capture.

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KataGo's Bad-Shape Move in the left centre.

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White's push into Black's corner does not lose a Main Semeai Liberty, as it creates an approach-move liberty at for her left-hand group.

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KataGo's Solid Connection.

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White continues with the Main Semeai.

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Black must not play any reduction, and so captures White's stones in his corner, what will enable him to approach White's left-hand group from below.

Before the end of the game, Black will have to take White's stones in the upper left corner off the board, with and .

Capture Variation:

Compared to the superordinate variation, ...

• Black's cumulated gain in the upper left corner is five points.
• Black's cumulated gain at the top is six points.
• White's cumulated gain in the lower left corner is five points.
• White destroyed one point of Black's territory in the left centre.

In total, White lost five points.

Black + 2 => Black + 7

Semeai Variation:

Compared to the superordinate variation, ...

• Black's cumulated gain in the upper left corner is five points.
• Black's cumulated gain at the top is six points.
• White's cumulated gain in the lower left corner is four points.
• Black captured two White stones more at the left side, so gaining two points.

In total, White lost nine points.

Jigo => Black + 9

2043a