hoshi911: The problem should be "unsettled".
Solution says white is dead, white 5 liberties and
black 6 liberties .
But this is wrong. Black only has 5 liberties, the same
amount as white has.
In particular the liberty at A16 counts only as one liberty
for black, because white does no have to play A18 beforehand, if this is the last liberty it has to fill.
So when white starts to play, black gets killed.
Problem is "unsettled"; whoever plays first, wins.
The problem should be "unsettled". Solution says white is dead, white 5 liberties and black 6 liberties . But this is wrong. Black only has 5 liberties, the same amount as white has. In particular the liberty at A16 counts only as one liberty for black, because white does no have to play A18 beforehand, if this is the last liberty it has to fill. So when white starts to play, black gets killed. Problem is "unsettled"; whoever plays first, wins.