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By Richard Williams BBC Wales Sport at the Principality Stadium

Six Nations 2017 - Wales v Ireland Wales (8) 22 Tries: North 2, Roberts Cons: Halfpenny 2 Pen: Halfpenny Ireland (6) 9 Pens: Sexton 2, Jackson

Wales survived an Ireland fightback to claim a pressure-relieving win and hand England a chance to clinch the Six Nations title against Scotland.

Wing George North scored two tries as the hosts opened up a nine-point lead early in the second half in Cardiff.

Ireland, inspired by Johnny Sexton, almost turned the game on its head.

Wales repulsed waves of attacks before Jamie Roberts clinched the victory with a 78th-minute try after Taulupe Faletau's charge down.

The defeat handed a potentially fatal blow to Ireland's championship challenge with England able to secure the title if they beat the Scots at Twickenham on Saturday at 16:00 GMT.

Who can still win the Six Nations?

If England beat Scotland on Saturday they will retain the title

Victory for Scotland could send them top of the table with a game to play

If France beat Italy and England lose, mathematically five teams would still be in with a shout

There is one final round of games after Saturday's matches

Joe Schmidt's Ireland side paid a high price for a yellow card handed to Sexton which saw Wales score 10 points in six minutes either side of half-time.

And, after a week which saw Wales coach Rob Howley talk about redemption, North in particular answered criticism with his best performance for Wales in some time.

Ireland contributed much to a brutal encounter, but could not cross Wales' try-line despite long periods of pressure.

And a mistake by centre Robbie Henshaw at a driving maul which handed Wales a penalty when they looked certain to concede a try effectively ended Ireland's hopes.

Rejuvenated North at the double

North looked like a player rejuvenated in the opening stages, clattering through Rob Kearney and looking a threat whenever he received the ball.

His endeavour was rewarded in the 19th minute when Rhys Webb and Scott Williams combined before the scrum-half's long pass found Leigh Halfpenny who fed North.

Faced with three defenders, the Northampton wing blasted through them to score with a bellow of delight. It was like 2012 all over again.

Sexton's ability to pick off Dan Biggar passes was a problem for Wales who were also second best in the aerial battle.

Halfpenny and Paddy Jackson - on briefly for a dazed Sexton - exchanged penalties as Wales reached half-time ahead and with the busy Sexton in the sin-bin for Ireland.

Numbers game pays

Johnny Sexton kicked six of Ireland's nine points they scored against Wales

Ireland found themselves nine points behind within four minutes of the restart as Webb fed an unmarked North for a second try, which Halfpenny converted from the touchline.

Sexton's return marked a change in momentum, and his second penalty threatened another second-half heartache for Wales after losing leads against England and Scotland.

But they withstood immense pressure in a tumultuous Principality Stadium with Ireland just failing to turn a number of dangerous aerial bombs into points.

And when Henshaw's rush of blood let Wales off the hook they forced Ireland back and it was another attempted Sexton kick which replacement Faletau charged down to let fellow substitute Roberts crash over at the posts and almost raise the closed roof.

Man of the Match - Rhys Webb

Rhys Webb was at the heart of much of what was good for Wales on Friday night. The busy scrum-half created North's first try and handed him his second on a plate.

Team details

Wales: Halfpenny; North, J Davies, S Williams, L Williams, Biggar, Webb, Evans, Owens, Francis, Ball, A Jones, Warburton, Tipuric, Moriarty.

Replacements: Roberts for S Williams (67), S Davies for Biggar (80), G Davies for Webb (67), Smith for Evans (67), Baldwin for Owens (72), Lee for Francis (70), Charteris for Ball (63), Faletau for Moriarty (67).

Ireland: Kearney; Earls, Ringrose, Henshaw, Zebo; Sexton, Murray; McGrath, Best, Furlong, D Ryan, Toner, Stander, O'Brien, Heaslip.

Replacements: Bowe for Kearney (70), Jackson for Sexton (19), Marmion for Murray (46), C Healy for McGrath (59), Scannell for Best (80), J Ryan for Furlong (80), Henderson for Toner (63), O'Mahony for Stander (63).

Sin Bin: Sexton (38).

Referee: Wayne Barnes (England)

Touch judges: Jerome Garces (France) & Matthew Carley (England)

TMO: Ben Skeen (New Zealand)

Rory Best: Ireland let Wales off the hook

Match stats Wales Ireland 47% Possession 53% 48% Territory 52% 4 (1) Scrums won (lost) 4 (0) 11 (0) Line-outs won (lost) 10 (3) 10 Pens conceded 4 117 (0) Rucks/mauls won (lost) 139 (1) 27 Kicks from hand 35 170 (21) Tackles made (missed) 155 (17) 387 Metres made 398 8 Offloads 7 7 Line breaks 7