:
Black secures the corner, and prevents the ko that will be shown in the C-variation for in our solution ( 532).
: White returns to the path of the solution.
White's group on the left has two liberties more than usual (, ). Consequently, Black will lose the Punishment Semeai with his top right group. White wins with ease.
Even the territorial loss in the upper left corner alone would have been too great a burden for Black.
Please note that - with Black's guzumi already played - Black will not gain an additional liberty for his own group (at ) by inserting Michael Redmond's kikashi in the bamboo joint (, ), even if played before the sequence shown here. Please refer to 840 for details.