King's Lynn Town and Kettering Town played out a goalless draw in a hard-fought encounter between the two promotion contenders.
Clear-cut chances were few and far between during a tense 90 minutes in front of Lynn's biggest crowd of the season.
The second-placed Poppies controlled long periods of the first half but after the break it was the Linnets who looked more likely to break the deadlock.
Kettering had the ball in the net midway through the first half but it was ruled out for an offside on Aaron O'Connor.
The best chance of the first 45 minutes came the way of Dion Kelly-Evans who blazed into the car park from the edge of the box with the goal at his mercy.
A Ben Milnes cross was nodded over by Richens before the same player fired an effort wide as the first half drew to a close.
Four minutes before the break, the dangerous O'Connor headed over as the Poppies remained well on top.
Lynn made a change at the start of the second half, bringing on Aaron Jones, as Lynn reverted to a 3-4-3 formation in an effort to find a foothold into the game and, shortly after, introduced Ryan Hawkins to add some more width out on the right flank.
A spell of concerted home pressure finally arrived with Chris Henderson twice going close to opening scoring.
Kettering were clearly happy to go home with a point while Lynn, who failed to score for the first time since Culverhouse returned to the dugout, were delighted to extend their long unbeaten run to 15 matches.
After the game, Culverhouse also confirmed that striker Harry Limb was sent out on loan to Pinchbeck on Friday - prior to fellow frontman Charlie Clarke reporting a thigh injury.