Substitute John Mousinho struck late to seal a vital victory for Stevenage against play-off rivals Carlisle.
Craig Reid could have put Boro ahead when he fired over from 10 yards while Carlisle keeper Adam Collin did well to save a Jamaal Lascelles' header.
Home keeper Chris Day then kept out a headed effort by Andy Welsh with his legs after the break.
Mousinho latched onto Stacy Long's pass before firing in off the underside of the bar to secure Stevenage's win.
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Stevenage manager Gary Smith told BBC Three Counties Radio:
"It was very exciting and this is what everyone is involved in football for.
"Carlisle were a good side and I thought the fans got behind us well.
"The occasion when two good teams come together is exactly what people are after. The games just keep getting bigger now.
"It's been a long, hard season but in the opening 25 minutes it was as enthusiastic and passionate as we've seen in a long time. It showed everyone we're going for this and feel we really have a chance."