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 Wales Women's team headed to Dare Valley Country Park on a team bonding exercise as the entire squad got together for the very first time in preparation for this season's Six Nations championship which kicks off on Saturday with a clash against defending champions Ireland, in Donnybrook.
Wales Head Coach Warren Gatland discusses his team selection for the opening round of the RBS 6 Nations where he leads his side against Ireland, on Sunday. As WRU TV's Luke Brodley discovers, Gatland is fully aware of the challenges the defending champions pose
WRUTV caught up with Wales Women captain Rachel Taylor at the RBS 6 Nations launch and how a good crowd really helps boost the girls performance. Tickets for all three Women's home games at The Gnoll, Neath are available from www.wru.wales/tickets