Two late goals at The Globe put the seal on a third straight win for Ruthin on Wednesday night.
After a goalless first half, Jacob Lloyd gave the visitors a 54th minute lead.
The points were not safe until subs Morgan Lloyd-Thomas and Sam Martin struck on 84 and 86 respectively.
Undefeated Denbigh are six points clear at the summit after Monday’s five-goal thrashing of the Lakesiders at Central Park.
The unstoppable Rhys Lloyd hit a hat-trick to make it 21 goals in just nine appearances this season for the Vale of Clwyd side.
Tom Smith, a first team squad regular, also made his mark with a double.
Captain Joshua Holmes netted three times for a Mynydd Isa outfit which rattled up a magnificent seven at Cae Sling.
Third-place Isa, unbeaten this season in seven matches, were also idenbted to John Griffiths for a pair, while Fraser Dodd and Riley Williamson also found the net.
Second-place Ruthin pocketed the points from an eight-goal thriller, Teifi Williams, Charles Jackson, Ciaran Roberts, Jacob Lloyd and Sion Williams sharing the home net-finders, the Wellmen replying through Jacob Byron, Lewys Williams and Josh Acott.
Tobi Osunjimi (2), Isaac Beck and Jordan Hadaway split the goals for Tudno, Sam Parry-Jones the sole marksman for NFA.
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