Braintree climbed up to tenth place in the Blue Square Bet Premier after stunning high-flying Mansfield at the Amlin Stadium.
The Stags came to Essex hoping they could be crowned champions and promoted back to the Football League, but instead ended the day off top spot.
Matt Green put the visitors ahead, but Alan Devonshire's men fought back thanks to strikes from Matt Paine and Kaine Sheppard to ensure the title race will go down to the final day.
In Blue Square Bet South, Chelmsford City climbed back into the play-off places thanks to a 2-1 win at Eastbourne.
Jamie Slabber – who scored the only goal when the two sides met last month – grabbed the opener after Danny Potter failed to claim a cross.
The Borough keeper was injured as he dropped the ball and was only able to continue after nine minutes of treatment – and was then replaced at half-time, with outfield player Matt Aldred donning the gloves.
Michael Bakare then put the Clarets two ahead, and despite a late consolation, they held on to move to within a point of fourth-placed Weston-super-Mare, who they will overtake if they can beat Tonbridge Angels on Monday night.
But it was a bad day for second-bottom Billericay, who were deservedly beaten by Salisbury City at New Lodge.
Centre-back Rob Swaine fired the Blues into a second-minute lead with a stunning strike from the edge of the box, but Chris McPhee levelled just after the half-hour.
The Blues struggled to get out of their own half during the second period, and Salisbury's dominance paid off when Jamie White grabbed the winner.
In Ryman League Division One North, Maldon & Tiptree's title hopes are over after they were beaten 2-0 at Grays, who secured promotion.
Ten-man Heybridge Swifts stayed in the play-off places after a 1-1 draw at home to Aveley, with Ben Newson on target for Mark Hawkes' men.
Witham Town have closed to within three points of the Swifts though after a 2-1 win at Waltham Forest.
And Brentwood Town overcame a missed penalty to see off AFC Sudbury 1-0, Steve Butterworth going from villain to hero with the late winner.
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