Ynysybwl suffered their first defeat of the season in Division Two following their heart-breaking 22-20 loss at Newport Saracens.
Simon Skinner's late penalty ended Bwl's three-match winning run and put them into third place in the table.
David Davies had already grabbed a brace of tries for the home side to add to Mark Bale's strike.
Instead, Llantwit Fardre hit the summit with a gutsy 27-26 victory over Rhydyfelin while Treorchy also leap above Ynysybwl into second spot with a six-try romp over Garndiffaith.
Abergavenny top Division Three after grabbing a five-point victory in their 31-3 home win against Croesyceiliog but Rhymney are hot on their heels following a comprehensive 34-3 bonus-point win over Blaina.
Greg Plant, Matthew Chard, Ioan Lane and Liam Buckley scored the tries to gain maximum points for the home side.
Fly-half Steve Lang grabbed 14 points in an impressive display which included three penalties, a drop goal and conversion.
New Tredegar scored six of the best in Division Four on their way to a comfortable 37-7 win at home to St Josephs.
But home dominance did not sweep the division as Old Illtydians, Risca and Talywain all recorded away wins at Machen, Abertillerty BG and Monmouth.
WRU TV were on hand at the launch of a major new commercial deal with WRU and Mercedes-Benz South Wales (part of the Sinclair Group), which sees the family company become an official supplier to the Welsh Rugby Union
On the back of the recent Women's Rugby World Cup, the WRU has launched a revitalised Women's and Girls domestic seasonal structure, and the future is looking bright.
Go to www.wru.co.uk/tryourgame for more information
Roger Lewis talks to WRU TV at the announcement of a new £60 million Rugby Services Agreement (RSA) which provides a new and positive contractual relationship between the WRU and its four Regions for the next six years has been agreed.
The Welsh Rugby Union has announced a major new sponsorship deal with Gullivers Sports Travel which will make the UK's leading, and longest established, multi-sport tour operator, an Official Supplier for the rest of the decade.
Having taken part in seven World Cups as a player and coach, Liza Burgess hopes to go out in style this afternoon when Wales take on Australia in the Play-off for seventh and eighth place in the Women's Rugby World Cup in Paris.
WRU Head of Rugby Josh Lewsey met with volunteers across the game earlier this week, championing their role in the sport. He was joined by Wales captain Sam Warburton for part of the day as volunteers took part in a 'Try Out' event for the 2015 Rugby World Cup