About Approach-Move Liberties (2009)
Approach-Move Liberties in Problem 120
From here on, we will use simplified versions of the problem, which are equivalent to the moment when Black has just played into the four-point eye of White's group on the left side in our solution. Black's guzumi at , followed by , creates two approach-move liberties (), equivalent to one real liberty. Black has three direct liberties (), ... |
|
... so White needs four local moves to take Black's group off the board. Please note that Black also had four local liberties beforehand (3, 1, , 4), thus the guzumi has not changed the liberties locally. | |