Blackwood opened up the title race in Division One East after edging their top of the table clash with Newbridge.
The Red, Black and Ambers toppled the league leaders at the Welfare Ground after tries from David Briggs and David James clinched a dramatic 12-8 victory.
The Newbridge advantage at the top of the table is cut to just three points and Blackwood's Lyn Hall believes the victory has opened up the division.
"This could be the catalyst for us to push on and to see what the season now holds for us" said Hall.
Leading the chase behind the top two are now Caerphilly, who capitalised on Merthyr's slip-up at Bargoed to take third place following their 22-12 victory over Ystrad Rhondda 22-12. Paul Adams and Stefan Sankala were try scorers for the Cheesemen.
Merthyr fell to fifth in the table after losing at Bargoed, who leapt above their visitors thanks to tries from Matthew Hutcheon and Geraint Hodges.
It took a last-minute try from Andrew Carlson for Rumney to break the deadlock in a tightly-fought 5-0 win over Newport Saracens, while the students of UWIC had no such problems scoring three tries in a 30-0 win at Beddau.
Carmarthen Quins had no trouble in keeping their 100 per cent record in Division One West when they hosted Dunvant.
Tries from Gavin Evans, Andrew Thomas, Alun Davies and two from Jamie Davies saw the visitors routed 27-0.
Quins picked up their sixth bonus point of the season, extending their lead at the top to 19 points.
With Tonmawr in Swalec Cup action, Narberth moved into second spot as captain Steve Martin scored two tries in their 26-15 win at Cwmllynfell.
Corus leapt above Carmarthen Athletic into fourth after beating them 34-15, Maesteg defeated Bonymaen 28-15 and Whitland saw off Felinfoel 18-12.
The WRU's Women and Girls legacy events - #TRY OUR GAME have proved popular this week with current players and newcomers to the game learning new skills and picking up tips from national squad players.
We caught up with Shona and Ellie from the Wales women team ahead of the start of the Women's Rugby World Cup in Paris next month at a recent women's training session to encourage and promote more women and girls to try their hand at rugby. #tryourgame
The Women's Rugby World Cup warm-up clash between Wales and USA proved bittersweet for centre Elen Evans. Despite being one of the star performers on the day on her 50th Test appearance, USA edged home 10-7 at Cross Keys.
Wales completed their Junior World Championship campaign with a victory over Samoa. Team manager Mark Taylor and No 8 James Benjamin reflect on a tournament which saw Wales win three games and lose two.
Wales U20 players Angus O'Brien, Nicky Thomas and coach Richard Hodges are determined to finish their Junior World Championship with a flourish when they tackle the big hitting Samoans tomorrow in Auckland.