The visitor had looked set to steal the points following a ninth minute own goal when central defender Darren Hughes headed over stranded keeper Ben Heald.
However, late strikes from sub Kelvin Frazer and Kevin Roberts turned the match on its he
ad before Sam Pugh's shot a in the last minute of normal time hit Eiddon Griffiths on the arm just a few yards away to give Ben Powell the chance to fire home from the spot.
The match had little to commend it, the ball spending too much time in the air on a bone hard pitch with both sides struggling to get it down.
Mynydd Isa had a couple of good sights of goal in the first half, defender Paul Connolly heading a corner narrowly past the angle and Ben Heald saving bravely at the feet of Powell at the near post.
Billy Evans had the hosts' only real chance, snatching at a low cross from Kevin Roberts.
Nathan Jones went close for the visitors early in the second period and Hughes made a crucial tackle on Pugh as Mynydd Isa opened strongly
The hosts weathered the storm and it needed to two tremendous saves from former Caernarfon Town keeper Dave Walsh to deny Kevin Roberts and Jason Harvey around the hour mark.
Walsh also saved superbly from Evans on 79 minutes, but sub Kelvin Frazer headed the loose ball over the defenders into the far corner from eight yards, Connolly getting his head to the ball on the line but unable to keep it out.
The big defender was fortunate to see just a yellow card for deliberately kicking Heald, but Llanfairpwll went ahead on 84 minutes when Roberts fired home from eight yards following good work by Frazer and Owen.
Home elation lasted just five minutes before the spot kick leveller, but Heald's forty yard piledriver in stoppage time almost wrested the points back, the ball deflecting just over the bar.
**
NEFYN United were denied a share at Welsh Alliance runners-up Glan Conwy by a last minute goal.
Alan Jones had the visitors in front on 33 minutes, but Brad Jones levelled four minutes after the interval and Alex Stapleton nudged the hosts ahead on the hour mark.
Gareth Williams looked to have earned a share with a strike five minutes from the end, but Paul O'Hara had the sting in the tail.
Amlwch Town's 2-2 share at Nantlle Vale secured their survival by the narrowest of margins, James Burgess and Steve Mason netting against efforts from Gwyn Jones and Alex Hanson for the hosts.
That takes Amlwch above Halkyn Utd by one goal difference, condemning the Clwyd club to the drop.
**
BEAUMARIS Town dealt Barmouth & Dyffryn Utd a hammer blow to their quest to retain the Gwynedd League title with a 5-4 verdict last Saturday.
The main damage was done in the first 21 minutes when Owain Roberts bagged a brace and Mark Owen hit the target.
The defending champions responded with strikes from Dean Irvine and Mark Griffiths before the break and when Billy Griffiths levelled two minutes into the second period it was game on.
However, Beaumaris regrouped and Gareth Dogan restored the lead on 50 minutes and Cameron Kelly scored seven minutes from time, but a Carl Ryan response from the spot two minutes later made it a tense finale.
Bethel won 2-1 at Blaenau Ffestiniog Amateurs, Gavin Jennings and Jamie Whitmore on target after Kieron Ellis had opened for the hosts, the win installing Bethel in second spot with a match at Barmouth on Saturday following Wednesday night's Eryri Shield final between the sides at Porthmadog.
Strikes in the last half hour earned Bontnewydd a 3-1 verdict at Real Llandudno after Chris Smith had broken the deadlock seven minutes into the second half.
Aled Jones-Griffiths levelled on the hour before goals from Llyr and Rhodri Owen and sealed the points.
**
LLANRUG United condemned Blaenau Amateurs to relegation from the first division of the Safeflue Caernarfon League with a 5-3 victory.
Keith Williams bagged a brace, with Gavin Rodgerson, Huw and Sam Williams completing the nap hand, after Tom Woolway and Llyr Morris had the visitors 2-1 ahead the break and Morris scored his second ten minutes from time.
Rob Daniels ensured the safety of Talysarn Celts with a first half double, but bottom club Pwllheli hit back with goals from Michael Williams and Dylan Jones to secure a 2-2 share.
Llion Jones and Ian John Jones both hit hat-tricks for Bangor City Reserves and Caernarfon Town Reserves respectively with Ben Ogilvey's goal five minutes from time giving the Farrar Road club a 4-3 verdict.
The full article contains 814 words and appears in n/a newspaper.