Glasgow Warriors powered to a 35-24 win over Connacht despite having Tim Swinson sent off in the second half.
Pat Lam and Gregor Townsend were both unhappy with Tim Swimson's red card during Glasgow's 35-24 win against Connacht.
Ross Molony's 66th-minute try saw Leinster squeeze past Cardiff Blues for a nervy 22-21 Guinness PRO12 win in Dublin.
The Ospreys lost ground on the top two in the Guinness PRO12 with a surprise 13-5 defeat to Treviso in Italy.
Ronan O'Mahony touched down twice as Munster strengthened their grip on a top-four spot with a 50-14 victory over Zebre.
Rhys Patchell scored 16 points, including two tries, as Scarlets registered a 26-10 bonus-point victory over Edinburgh.
Ulster continued their push for the PRO12 play-offs with a late rally to secure a 27-17 win over Newport Gwent Dragons.
New Connacht coach Kieran Keane has confirmed Nigel Carolan and Jimmy Duffy will be part of his backroom staff next season.
Get 12 months for £18 per month
Catch the action - watch instantly from £6.99
Once in a lifetime opportunity - enter now!
Win in our free to enter competitions section
We've a host of top class rugby union action
Stuart Barnes, Rory Lawson, Scott Quinnell and Shane Horgan discuss potential Lions line-ups and key talking points.
Sir Ian McGeechan has backed former Wales captain Sam Warburton to lead the Lions in New Zealand in June.
Ireland and the Hurricanes lead the way after their impressive victories on Saturday, with seven teams represented.
Scott Quinnell, Will Greenwood, Rory Lawson and Alan Quinlan select their Lions XVs after the final round of the Six Nations.
From the surreal to the sublime, Will Greenwood brings you his favourite moments from the weekend's rugby.
Stuart Barnes on England's defeat in Dublin, his best moments from the Six Nations and Dylan Hartley's Lions chances.
Dewi Morris relives England's last back-to-back Grand Slams and compares the game and team with today's era.
Three England teams and a Super Rugby wardrobe malfunction feature in Will Greenwood's favourite moments this week.