Whittlebury Park and Daventry are now the only two teams who can catch Kettering at the top of the standings after contrasting recent results.
Jon Newman and Jason Robinson’s victory on the first extra hole for Whittlebury against Peterborough Milton kept the team’s qualification hopes alive as they edged a tight home contest 3-2.
Daventry, who host Milton before travelling to Whittlebury in their final match, stay second behind Kettering despite suffering a 4-1 loss at Oundle.
Overstone Park kept alive their semi-final hopes with a battling 3-2 away success at previously-unbeaten Northants County.
With all five ties going the distance, Overstone grabbed the honours thanks to points from James Barker and Richard Dalton in game one, Peter Gasson and Sean Davis in the next tie and James Gardner and Pete Softley in the last match.