Brymbo stormed to the top of the Premier with a six-wicket success at previous leaders Bangor.
The hosts won the toss and batted, but struggled all the way, dipping to 40-5 at one stage before finishing 102 all out.
Skipper Dan Parry took 3-10 off 10 overs, Jack Williams 2-13 from 10, Richard Deniz 2-16 and Joe Norman 2-28.
The Steelmen reached 106-4 off 31 in reply, Chris Taylor making 35.
The bottom two teams produced an absolute thriller as Conwy chased down a big target with two balls to spare.
Bethesda opted to bat and set an impressive 244-6 off 50 overs, Nicholas Parry posting 66 and Tomos Davies 65, that pair putting on 104 for the third wicket, opener Carwyn L Williams 36 and Ben Parker 32 not out, Shaun Davies 2-51 for the visitors.
In reply, Conwy made it to 245-8 off 49.5, opener Daniel Davies making a season’s best 93 and Evan Williams 45, Davies 4-25 and Parker 2-33 for Pesda.
Champions Mochdre jumped into second spot and are just five points off the leaders after a comfortable six-wicket victory at Ystrad Road.
Hosts Denbigh made 169-5 off a reduced 45 overs, skipper Harrison Jones top-scoring with 66, Adam Campion 2-26 for the visitors, who hit back with 170-4 from 33.4, Will Evans 57 not out and skipper Campion 36.
A strong batting effort from Northop set them up for a cracking win at Tyn-y-Caeau.
Calling the coin correctly and electing to bat, the visitors rattled up 281-9 off 50 overs, Venumadhav Peram scoring 59, Jordan Evans 46 and Jamie Northcott 42.
Dion Holden claimed 3-32 and Ayush Verma 2-48 for Menai Bridge, who were then dismissed for 167, Verma 44 and Jack Gower 41, Peram 2-13 and Bart Ryan-Beswick 2-19 for the impressive Flintshire travellers.
All-rounder Dan Evans led the way with a season’s highest 68 not out and grabbed four wickets as St Asaph chalked up a winning score at Elwy Grove Park.
Ryan Dunning struck 38 not out, sharing in a crucial unbroken ninth-wicket stand of 81 with mainstay Evans. Matty Ryan added 35, while for Gwersyllt, Jack Billington scooped 4-33, Iroshan De Silva 2-19.
The visitors were then all removed for 139, Kastun Stoute 34 and Billington 31, Evans 4-38, Robbie Prior 3-7 off 10 and Danny Ryan 3-8 off six for the winners.
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