Ollie Maltby’s 30th goal of the season was enough to extend Pinchbeck United’s unbeaten run.
The Knights have won 17 out of 19 games over the past five months.
They are now 13 points in front of second-placed Raunds Town, moving even closer to promotion and the championship thanks to Saturday’s win against Rushden & Higham United at Hayden Road.
Player-manager Ian Dunn said: “Both teams struggled in those conditions.
“The pitch was quite hard in a shaded section on the stand side but it gradually eased off.
“The rest of the surface was soft in places so even creative players like Tyler Wright, Aaron Eyett and Andrew Tidswell couldn’t drag the ball out.
It was disappointing that we couldn’t add a couple of goals because the 1-0 scoreline looks like we only sat back to protect the lead.Ian Dunn
“We got the goal from one moment of quality when Wright put a decent ball into the box, Tidswell’s volley was pushed out and Maltby smashed in the rebound from a few yards.
“The players and management didn’t appeal for offside – despite some reports coming out – and we had another goal wrongly disallowed when the defender had poked the ball.
“The first half was pretty poor and we felt that we gave them too much space when they broke forward.
“We addressed that at half-time and looked more solid. We were compact and disciplined.
“Dan Swan made one save when the ball deflected off Tidswell but we created plenty of chances.
“We should have done much better and tested the keeper.
“It was disappointing that we couldn’t add a couple of goals because the 1-0 scoreline looks like we only sat back to protect the lead.
“We were sound at the back but it was a shame we couldn’t finish off our good football at the other end.”