In this problem, after Black cannot just rest on his laurels.
is necessary to kill, because of damezumari for both players. :-)
Playing here is no good either. Black answers with
and White is in damezumari again. If White plays either a or b, Black can capture some stones.
iopq: This looks fine to me now, but it's 5:45 AM and I don't know WHY I'm looking at goe problems. Nope, it doesn't work: