Chester made it an excellent six games unbeaten - with six clean sheets in a row - after a narrow victory over North Ferriby this evening.
James Akintunde's goal a quarter of an hour from time secured another superb Blues victory.
Jon McCarthy had made one change from Saturday's romping 5-0 win over Dover - with James Alabi dropping to the bench for Akintunde.
The first half was actually a pretty drab affair - with both sides creating half chances. Liam Roberts did have to be sharp though to deny Thompson and Danny Clarke for the home side.
At the other end, Watson made a stop to preserve the stalemate from Akintunde.
Just after the break, both sides rattled the woodwork. First, Ryan Astles struck the post from a set piece routine before Russell struck the crossbar for United.
Ultimately, the games turning point came on 66 minutes when Ben Middleton was dismissed for the home side for a second bookable offense.
This allowed the Blues to break the deadlock on 75 minutes, when Akintunde latched onto Johnny Hunt's long ball forward; and slotted home after showing tremendous composure.
NORTH FERRIBY: Watson, Topliss, Gray, Middleton, Hare, Skelton, Oliver (Mukendi 84), Russell, Clarke, Wootton (Emerton 76), Thompson (Kendall 76).
SUBS NOT USED: Fallowfield, Robinson.
BOOKED: Middleton, Oliver, Thompson.
SENT OFF: Middleton.
CHESTER: Roberts, Astles, Hughes, Hunt, Vassell, Shaw (Joyce 46), Lloyd (George 46), Durrell, Mahon, Akintunde, Richards (Alabi 66).
SUBS NOT USED: Chapell, Horwood.
SCORERS: Akintunde 75.
REFEREE: Alan Young.