Boston Rugby Club overcame the threat of second-placed Ashfield to remain the only side in the Midlands 4 East (North) with a 100 per cent record.
Willem Jonker’s side - who began the campaign on -12 points - claimed their fifth consecutive scalp since their summer promotion, winning 23-15 at the Boardsides.
In a hard-fought encounter, the Blue and Whites maintained their character, discipline and composure at vital times.
Playing against the strong wind in the first half, a poor start saw the hosts go 5-0 down.
But three first-half yellow cards for the visitors cost them dearly. Boston’s Billy Wilson was also sin binned in the encounter.
Centre Jake Brooks scored in the corner the level the scores, before the same man put the Blue and Whites 10-5 ahead.
However, Ashfield grabbed their second try before the break.
Four minutes after the break, a scrum penalty allowed fly half Tom Brooks to kick Boston back in front.
Injuries to Zac Chapman and Ben Enderby - replaced by Wayne Barratt and Kenny Doig - saw Boston temporarily lose momentum.
Ashfield pounced to score theiur third try, leading 15-13.
But undeterred, winger Michael Baldwin grabbed Jonker’s pass to regain the lead.
Tom Brooks converted, before kicking a late penalty to ensure victory.
BOSTON: Kemp, Sergeant, Deamer, Enderby, Stokes, Noble, Wilson, Hughes, Jonker, T. Brooks, Ze Chapman, J. Brooks, Smith, Baldwin, Za Chapman; Replacements: K. Doig, C Doig, Lane, Miles, Barnett.