Posh scored twice in the final six minutes of the match to win the game, but it was far from a fortunate win.
Posh outclassed their hosts for long periods and they have earned some ratings that reflected how good they were.
RATINGS KEY: 10-Out of this World, 9-Outstanding, 8-Very Good, 7-Good, 6-Okay, 5-Poor, 4-Stinker.
5. RONNIE EDWARDS
Showed his pedigree again with a performance of some class. Excellent in possession and no-one at this level can get past him - 9. Photo: Joe Dent
6. HECTOR KYPRIANOU
Outstanding in the first half when he outclassed a couple of highly-rated Derby midfielders. Not so influential after the break and was fortunate not to pick up a second yellow card for deliberate handball after conceding a penalty - 8. Photo: Joe Dent
7. ARCHIE COLLINS
He's just an 8/10 performer in most matches. Hardly wasted a pass and he reads the game so well - 8. Photo: Joe Dent
8. JOEL RANDALL
He's a key man in this Posh formation and there is so much to admire in how he glides across the turf and finds space. His tracking back in the last two games has been exceptional, but his finishing is a concern. He missed a sitter at 1-1 which looked like being crucial - 7. Photo: Joe Dent