Tom Harrison (2) and Wayne Edwards notched the goals which put Mountain through to the NEWFA Reserve Cup final.
In the showpiece game, Mountain will take on Ruthin Town Reserves, who defeated Greenfield Reserves 1-0 in the other semi last week.
Matty Holmes replied for Penyffordd in Wednesday’s last four clash at the Essity Stadium, Flint.
Third-place Llandudno achieved what must be one of the biggest senior team victories in the club’s history on Tuesday evening at the OPS Wind Arena.
It was a pretty strong under-21 side which took on next-to-bottom Porthmadog, Levi Montgomery leading the charge with a hat-trick.
Other goals came from Harley Doyle, Harvey Bennett, Mckenzie Slaven, Mitchell Williams, Steffan Roberts, Freddie Banning (2), Cieran Williams, Harri Jones, Jordan Hadaway and Robert Gaze.
James Nuttall, club record marksman Greg Draper and Lucas Alamanos were among the scorers as title hopefuls The New Saints overcame the challenge of Ruthin at Park Hall.
Honours even at Cae Bob Parry where the ever-prolific Tomos Williams gave Llangefni 34th minute lead before Jamie Turner levelled for Llanrwst on 70.
Ben Connolly (pen), sub Dylan Evans and Jayden Tang knocked in the goals for table-toppers Nomads at The Quay 3G.
Jamie Foulkes’ 89th minute finish clinched maximum points for the Albion.
Jordan Williams bagged the other two home goals, Thomas Evans seeing red for the hosts on 40.
Paige Wilding (pen) and Luke Armstrong replied for Brickfield, who were on terms at two-apiece come half time.
Ben Lawrence, Wayne Edwards and Taylor Edwards claimed the all-important goals in another victory for second-place Mountain.
Matthew Grundy collected Llay’s consolation goal.
Carwyn Davies struck at the double to earn Rhos Aelwyd maximum reward at The Rec.
Davies netted on 32 and 80 minutes for the Wrexham visitors, Tomos Pritchard having equalised after 74 for Pwll.
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