: ( 58ai)
Black plays the hiki in the upper left.
However, his hopes of maintaining the territory in the upper left corner will end in vain.

We inserted this alternative move manually. The sequence below shows KataGo's continuation (in a selfplay game).

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White captures Black's stone in the lower left as a kikashi, ...

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... before attacking Black's upper left corner, starting with the descent to .

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Black tries to separate White's stones in the corner.

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White intends to enlarge her base at the upper edge.

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White threatens to cut at the right.

: ( A 58ak)
KataGo chose this connection at the forth line.

If Black played the move at , instead, he would not lose his entire corner as below, while still being unable to avoid a decisive defeat.

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White gives atari in the corner.

It would be too early to cut with at the outside.

: ( 108 58am)
Black connects his stone in atari.

If Black extended to , instead, he would not lose his entire corner as below, while still being unable to avoid a decisive defeat.

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White gives counter-atari in the corner.

Again, cutting with at the outside would be mistaken.

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Black captures White's two stones in the corner.

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White gives atari from above.

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Black connects his two stones at the right.

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White captures in the corner.

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Black's hane destroys White's potential second eye in the corner.

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However, White's throw-in spoils Black's shape at the left edge.

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Black has to capture White's just played stone.

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White reduces Black's corner territory and the liberty count of his group as well.

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It will develop a ko fight in the upper left corner, so White captures the hanezeki's tail, in order to generate a wild bunch of ko threats.

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Black recaptures, of course.

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White continues with the semeai in the upper left corner.

She might have played this sequence first, and captured the hanezeki's tail later.

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White starts occupying Black's outside liberties.

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Black attacks the eye shape of White's corner group.

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Black gives atari in the corner.

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White captures Black's just played stone, beginning the game-deciding ko fight for the life or death of Black's group in the upper left corner.

This ko is an approach-move ko, in principle favouring Black; and a two-stage ko as well, favouring White.

Ko: ; ; ; ;

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Black gives atari at the outside.

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White captures in the corner for a second time, opening stage two of the ko fight.

The ko has become a direct one now, as White would win the fight by connecting this second ko.

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Black threatens to capture some White stones in the upper right.

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KataGo answers Black's ko threat.

White would be able to win the game by terminating the ko fight just now. However, she has sufficient own ko threats available, as we will see, and therefore does not need sacrificing her stones.

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White's oki starts a serious of White ko threats in the hanezeki.

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Black threatens to capture White's left-hand group.

Ko: ; ;

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Black threatens to cut through at the top.

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Black captures on the outside, intending to increase the number of his group's liberties.

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Again, Black threatens to cut through at the top.

Ko:

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This is White's final ko threat in the hanezeki.

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Black does not have any valid ko threats left.

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Wihte connects in the upper left corner, so terminating the ko fight. Black's corner group is dead.

White will win the game by about 40 points.