But it could have been worse after they moved a point nearer to Carlisle United after their defeat, with Cobblers also having a game in hand.
Salford City are just two points further back after securing back-to-back wins as a three horse race begins to develop for the third automatic promotion place.
Here is who is going up according to the latest supercomputer predictions.
Give us your predictions on how the season will go via our social media channels.

9. Mansfield Town - 68pts (+5)
Promotion chances 11% Play-off chances: 28% Photo: Chris Holloway

10. Walsall - 67pts (+10)
Promotion chances:10% Play-off chances: 25% Photo: Michael Regan

11. Tranmere Rovers - 65pts (+9)
Promotion chances: 7% Play-off chances: 18% Photo: Lewis Storey

12. AFC Wimbledon - 64pts (+2)
Promotion chances: 5% Play-off chances: 15% Photo: Clive Rose
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