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(Referenced by 361; 991; 1061)

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: ( 960)
White occupies an outside Black liberty first, before capturing the ko with .

White now has four liberties (2 * w, 2 * c), against five liberties for Black's group (2 * c, 2 * b, k).

:
Black uses his ko-threats on the right side.

:
White must have at least one ko-threat available to win the ko-fight. Please note that it is White who must look for the first ko-threat.

Ko: ; ;

:
Under the assumption that Black also has valid ko-threats available, Black needs as many ko-threats as White to win the game.

:
Black captures the ko for the last time and will win the game by giving atari at .

White's starting the ko-fight later had no other effect than to cost White a ko-threat unnecessarily.