Neath's title challenge was dealt a crushing blow as Swansea ripped the Welsh-Scottish league title wide open.
Victory would have almost assured the Welsh All Blacks the title, but the All Whites gatecrashed the party to virtually seal their place in next season's Heineken Cup.
Neath looked to have given their championship bid a huge boost when the hugely impressive Lee Jarvis dashed 40 metres after pouncing on his own chip forward to register the first try of the game.
His successful conversion was then matched by a delightful drop goal for the away side to race into an early lead.
But his opposite number Gavin Henson cut the deficit with his first penalty of the evening after 20 minutes.
Neath were powerless to prevent the All Whites from surging back into the match when Darren Morris muscled his way over for a try. Henson failed to convert from the touchline but the youngster added a second penalty on the half-hour mark to edge Swansea in front for the first time.
A drop goal from Jarvis in first-half injury time gave Neath a 13-11 interval lead, but a rare penalty miss after the break increased the pressure.
The Swansea pack turned the screw and their success at a scrum 13 minutes from time gave Henson the chance to emulate Jarvis and drop a goal under the posts. A carbon copy four minutes later sealed victory for Swansea leaving Neath's title bid laying in tatters.
The result leaves the door wide open for Llanelli, Newport or Cardiff to clinch the title.
The Scarlets will claim top spot if they can overcome Cardiff at The Arms Park on Friday evening. But should they slip up Newport could pounce if they were to win their two remaining fixtures against Pontypridd and Bridgend.
Cardiff are still in the hunt but they would have to run in a hatful of tries in their final game against Llanelli.
Whatever happens the gripping climax to the title has gone right down to the wire and this weekend someone will be celebrating the championship.
The Half a Game initiative is currently sweeping across Wales and proving a major success. The scheme aims to give every young player at least half a game every weekend. WRU TV recently visited a festival in Narberth where clubs have fully embraced the initiative.
Both Bargoed and Swansea were seeking their first win of the Principality Premiership season this afternoon. It proved a fruitful day for the hosts - not only did they win, but Bargoed claimed a try bonus point.
Cardiff managed to keep their unbeaten record at home intact, but only just as Bridgend made them work extremely hard before the Blue and Blacks secured a hard fought Principality Premiership win at the BT Sport Arms Park last night.
Former Wales back row Andy Powell gives a guided tour of The Wern, home of Merthyr RFC, who are determined to prove a lot of people wrong and make their mark in their first season in the Principality Premiership.
Wales Sevens head coach Gareth Williams looks back on the Rio Sevens success where he helped GB win silver. He believes the successful campaign is a huge boost to his Welsh squad as they prepare for another World Series, as WRU TV's Graeme Gillespie discovers
British and Irish Lions head coach Warren Gatland will be heading back home to take on the All Blacks next year where for him, success for 2017 is all about going to New Zealand and winning a Test Series.
Last week all roads led to Eugene Cross Park where defending champions Ebbw Vale hosted this season's launch of the Principality Premiership. WRU TV's Graeme Gillespie was there to capture the thoughts of Damien Hudd, captain of Ebbw Vale, and WRU Head of Performance, Geraint John.
Llandovery made it three in a row when they defeated Aberavon in the final of the National Foster's 7s at BT Sport Cardiff Arms Park on Sunday. On another eventful day of sevens, Newport claimed the Plate and the Dragons won the women's crown
Last week saw Cardiff welcome players from around the world for the 21st Golden Oldies Festival. The tournament features players over 35 years of age, and this year's event saw a select few represent the WRU in a 'friendly' against the Wooden Spoon.
Wales Under 18 captain Callum Bradbury is delighted to have seen his side claim a narrow 18-17 victory against a strong SA Schools 'A' side to end the three-match Under 19 International Series in South Africa on a high note.