: ( 91)
White must play this push first, before the hane. This is also shown in the theory chapter as (FLAG 9b ( 1059).
:
If White did without, Black would answer at , also taking a liberty of White's group in the top left. But White would have lost a ko-threat, at later.
:
If Black cannot gain ko-threats against the lower part of White's group on the left, it might be sufficient to play at only.
Ko: ; ; ;
: (137 97)
Black must play this move latest now, because it will be no threat any more one ko-cycle later.
Black will get one ko-threat on the left side only, so playing at , instead, will make no difference.
:
This ko-threat is suicidal, but that cannot be helped.
:
White has no direct ko-threats left that contain an immediate threat. But White has the chance to play this "very slow" move, due to the special circumstances in the upper right. As you will see soon, this is a move that threatens to threaten to threaten to threaten something.
, :
Black must not allow White to recapture the ko on the right with a move at , so he is unable to answer White's moves locally.
:
White's forth move in a row kills Black's large group on the left side, therewith winning the game.