Rotherham moved into the top three of League Two and guaranteed a place in the play-offs with a late 2-0 victory at Bradford.
The Millers' victory over their Yorkshire rivals to leapfrog third-placed Burton on goal difference with two games remaining.
They had to wait for their goals, Lee Frecklington opening the scoring with an 80th-minute penalty and Kieran Agard sealing the points in the closing seconds.
Only two play-off places now remain open, with the defeated Bantams and Northampton currently occupying them.
Northampton could have confirmed their spot with victory over Wycombe but instead claimed a goalless draw and sit five points ahead of Exeter in eighth with six still to play for.
At the wrong end of the table, bottom club Aldershot took another step closer to non-league football as they were beaten 2-0 at home by Southend.
The Shots, four points from safety, maintained a stalemate until the 70th minute but then conceded twice in eight minutes as Barry Corr and Britt Assombalonga notched.
Southend, meanwhile, still have a chance of making the top seven but need to make up a four-point gap.
Another key relegation contest between Torquay and Barnet ended in delight for the former and despair for the latter.
Hosts Torquay won 3-2 to exit the bottom two, creating a vacancy which their opponents duly filled.
Elliot Benyon put Torquay ahead in the 25th minute and despite a brace from substitute Jake Hyde, efforts from Billy Bodin and Brian Saah saw the home side over the line.
Barnet lie one point worse off than York, AFC Wimbledon and Torquay.
In the final fixture Plymouth were 2-1 winners at Chesterfield.
Joe Bryan and Curtis Nelson scored twice in five first-half minutes before Guy Branston's own-goal reduced arrears.