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.

13. Sutton United - 63pts (-8)
Promotion chances: 3% Play-off chances: 9% Photo: Clive Mason


15. Doncaster Rovers - 61pts (-13)
Promotion chances: 2% Play-off chances: 7% Photo: Mark Fletcher

16. Grimsby Town - 59pts (-6)
Promotion chances: 2% Play-off chances: 7% Photo: Joe Portlock
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