Half-centuries from Stuart Watkins and Andrew Davies guided Conwy seconds to a three-wicket home victory.
Visitors Mynydd Isa and Maeshafn were invited to bat and posted 166-6 off a reduced 30 overs, wicket-keeper Stuart Applewhite an excellent 76 and Yash Soni hitting 36.
David Owen scooped 2-23 and Harry Driscoll 2-42 for the hosts, who hit back with 167-7 with two balls to spare.
Number three Watkins struck 72 and opener Davies 50, the pair putting on a vital 129 for the second wicket.
Conwy lost a few batsmen from there, but still made it over the line, Soni 3-36 and Umang Desai 2-25 for the away side.
Put in by the hosts, division leaders Ruthin were limited to 112-9 off 40 overs, number seven bat Jamie Hughes saving them from further embarrassment with 44.
James Thomas was the star bowler for the home side, taking 6-20 off eight overs.
Quay just got home on 116-8, from 39.5, Kevin Jones hitting a crucial 37. Llyr Williams took 3-20 and Matthew Duckworth 2-42 for Ruthin.
A six-wicket win for Denbigh seconds in a low-scorer at Ystrad Road.
The home side put their visitors in and dismissed them for a paltry 39, Simon Williams taking 3-8 off eight, John Lloyd-Williams 3-8 from five and Jake Hall 2-8.
Denbigh reached 40-4 in 9.4, Mike Griffiths 2-6 and Josh Marshall 2-30 for the visitors.
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