: ( 287)
White must return to the ko-variation with this move.

: (94 290)
However, White makes a massive mistake here, with thoughtlessly following her "usual" procedure.

:
It is mandatory for White to solidify her own eye-shape with a move at , instead.

:
Due to his strong position on the left, Black can now cut inside White's eye shape.

:
The circumstances seem to be the same as in the main line of this variation, so what is going wrong for White? White's centre group has five liberties (2 * , 3 * ), Black's group in the lower right has also five liberties (4 * , ), and Black's group in the top right has seven liberties (2 * , 4 * , ).

:
White prepares the ground for her ko-threat in the upper left corner.

:
However, her atari does not work any more.

:
The key element is the ko-shape in the upper left. Black gets back two liberties by this atari on White's centre group, and will win the game.