Craig Mackail-Smith signed off from London Road in style as his 34th goal of the season booked Peterborough a League One play-off final place with Huddersfield.
The Scotland international will leave for bigger things in the summer but could help Posh to promotion first after his close-range effort sealed a 4-3 win on aggregate over MK Dons. Karl Robinson’s side held a 3-2 lead from the first leg which was wiped out early on by Peterborough captain Grant McCann’s free-kick.
And Mackail-Smith then struck in his final home appearance for the club to put Darren Ferguson 90 minutes away from his third promotion as Posh boss.
Mackail-Smith struck early during Sunday’s first leg and had an early chance again when Tommy Rowe found him inside the area but his low shot was turned around the post by goalkeeper David Martin.
And they wiped out the deficit in their next attack with their 109th league goal of the season when McCann struck in the 11th minute.
Lee Tomlin was clipped to the right of the area and McCann stepped up to bend a free-kick over the wall and in at the foot of Martin’s near post.
The goalkeeper should have done better but the Dons recovered quickly and Angelo Balanta soon had Paul Jones scrambling to make a save at the other end.
Mackail-Smith had barely touched the ball in the second period before he bundled in a second in the 54th minute.
Goalkeeper Martin did well to keep out Boyd’s initial shot but Mackail-Smith was on hand to smuggle the ball in from close ran.