If Zambia beat Costa Rica, NZ advance
If Zambia and Costa Rica draw, NZ advance
If Costa Rica win, NZ must wait.
THEN
If Japan-Italy is won and lost, NZ advance
If Japan-Italy is drawn, NZ must wait
THEN NZ PLAY.
If NZ remains on 4, but gets dropped to third, because Vietnam wins with a decent GD swing
THEN
They could already have a good enough GD (unlikely) and advance
Or … they need the US to beat Saudi Arabia.
Or … they will need a combo of results that leaves them as one of the four best third placed teams.
No promises that any of that is true, it is 1.30am, after all.