Caolan Lavery bagged a last gasp winner for Chesterfield at MK Dons to move the Spireites to within a point of the League One play-offs.
The striker, on loan from Sheffield Wednesday, swept home Tendayi Darikwa’s cross in the 90th-minute to reignite the Blues’ top six ambitions.
Gary Roberts had cancelled out Lewis Baker’s opener for MK Dons, who were reduced to ten men when Dean Lewington was shown a second yellow.
It followed a first win in five on Saturday (February 28) against Fleetwood Town on home soil to end a run of four consecutive defeats.
Chesterfield manager Paul Cook said: “We played well. We went four games on the bounce losing games but on that showing you wonder how it can happen to a team like us but it does, it’s the nature of the game.
“We’ve delivered a disciplined performance out of possession and created chances in possession. First half we were done by a wonder-strike and we go in one-nil down.
“We’d stopped believing that we were going to win and that’s something we’ve got to learn. We’ve still got a young group in many ways but they were a great credit to the club.
“The atmosphere on Saturday at home to Fleetwood was fantastic and we’ve had 200-odd fans come down and they go home very happy. That pleases me as a manager.”
The Spireites have the rare luxury of a Saturday off this week (March 7) due to Bradford City’s continued involvement in the FA Cup.
Chesterfield will make the trip to Valley Parade on Tuesday, March 31 (7.45pm). They are next in action on March 14 at home to Coventry City.