A couple of scenarios....duke still has to play Pitt who right now has one loss too. If duke were to beat Pitt and unc the only games left would be uva and wake forest. Pitt plays notre dame the week before duke. So we would need duke to lose to either uva or wake forest ...you get the picture on that scenario.
if unc beats duke then duke would have two losses going into Pitt...wouldn't really care about the outcome of that game since we still have to play Pitt. Unc wouldn't have any losses going into our game (but coming out of the game with one loss)...the toughest games remaining for them would be at Virginia Tech and at NC St to end the year back to back. Also, Virginia Tech will have 9 days to prepare for UNC and it will be his last home game.
i would much rather have to rely on va tech and nc state than having to rely on Pitt beating duke (especially since Pitt would be coming off playing notre dame).