Nigel Clough was pleased to see his players grind out a 1-0 victory over Stevenage at Bramall Lane on Good Friday.
A John Mousinho own goal within the first ten minutes of the game settled the contest in the Blades' favour and, given Peterborough's defeat at Bradford City, kept alive United's faint hopes of a play-off spot.
The Gaffer remarked: "It was hard work, but we ground out a win and it keeps the season alive, which is remarkable given where we were at the beginning of February.
"When you are playing teams at the bottom that are fighting for their lives you know you will have to fight for every ball and defend resolutely and we have done again."
Looking back on the three points over Graham Westley's men, Clough added: "In the first-half we looked sharp and dangerous, but fatigue and mental tiredness played a part as the game progressed.
"It was a gamble naming an unchanged team because there were a lot of tired bodies and minds in the dressing room, but the best way to handle that is by getting out there and playing.
"Let's give Stevenage the credit they deserve, but also our lads have once again got a win and kept another clean sheet, our record in midweek matches lately is remarkable."