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:
However, if White's centre group had three liberties only, e.g. assuming the exchange of / played earlier (this means, for example, that White mistakenly must have captured the ko one move too late), Black's atari in the nakade would be a valid ko-threat.

Ko:

:
White is unable to play tenuki. She should have connected the atari, instead.

:
Black wins the semeai by one move (if he has as many ko-threats as White). White is forced to use her own ko-threat, at , in the top left corner to win the game.

One challenge, however, remains for Black: Without White's co-operation, he can not reach the situation presented here.

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In principle, it is better for Black to give the atari on the first line, as shown here. This will assure him two ko-threats in the nakade, not only one.

:
White should not choose the connection of , instead. Black would gain an additional ko-threat.

Ko:

:
This is Black's second ko-threat on the left side.

If we assume the exchange of / to have been a White ko-threat, the number of White's ko-threats in the top left corner has been reduced from five to three effectively (, , ), but which is still enough to win the game.

Ko:

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:
White mistakenly connects the atari.

:
This is a very surprising move. It is not only a ko-threat in itself, but gives Black the option for another one.

Ko:

:
White's -group has only four liberties left (), but Black's connected group on the lower edge still has five liberties. This means that White is unable to connect the ko.

On the left side of the board, there is no move available, with which White could pre-empt all Black options for further ko-threats.

:
In the top left corner, White has only two ko-threats left (, ), one ko-threat less than before.

Black has valid ko-threats in the nakade, only if White's -group has less than six liberties, or White's centre group has less than four liberties.