: ( 364)
Starting this ko on the upper edge is correct. Thereafter, White will be forced to start the decisive ko on the right side "early", to exhaust Black's ko-threats in the upper left corner.

White should also refrain from connecting her single stone with a move at beforehand, because that would waste a ko-threat.

: (88 373)
Black is unable to connect the atari instead.

:
Black plays a ko-threat at the bottom. White must answer, because otherwise she will lose the semeai with Black's group in the top right. She would then be forced to capture the hanezeki's tail, but would still be unable to capture Black's top right group, so losing the game.

:
White uses the connection of her single stone as an internal ko-threat.

: (A 374)
Black gets this ko-threat for free. This throw-in would have been played later anyway.

However, Black should not try to live in the top right corner, starting with a move at . White will finish the ko, and let Black get what he wanted, because she will be able to win the game anyway.

Ko: ;

: (A 376)
Black is forced to play a disadvantageous ko-threat on the right side. This is what White hoped for when starting the ko in the upper left. With , Black's group in the top right loses a decisive liberty, in sente for White.

It does not help Black to give atari at , instead.

:
White cannot win this ko, so she lives on the left side.

:
Black starts the "usual" sequence on the right side.

: (119 377)
Here, it will not benefit Black to do without this kikashi in the bamboo joint.

: (A 378)
:
White must start the ko "early", instead. The "late" ko will not work here.

:
Black prepares the ground for a "quick" ko-threat against White's group in the top left corner. He plays this sequence at the last possible moment before being forced to connect the hanezeki's tail.

:
White starts the ko-fight "late" now, at the moment her centre group has five liberties left.

:
Black is forced to use one of his very valuable remaining ko-threats before connecting the hanezeki's tail.

Ko: ;

:
This is Black's last effective ko-threat on the left side. It will not make a difference to give atari at , instead.

Ko:

:
Black uses is suicidal ko-threat in the hanezeki.

Capturing the two White stones with a move at , instead, does not help now, because White's group has one liberty too many.

:
Black wins the semeai in the centre by one move, and so the game.

White should have started the ko "early", to exhaust Black's ko-threats.