Scotland secured a dramatic, but deserved Six Nations win over Ireland, thanks largely to a stunning pair of tries by Stuart Hogg, and one from Alex Dunbar.
Ireland fought back, though, with tries from Ulstermen Iain Henderson and Paddy Jackson, but Greig Laidlaw won it for the hosts with a pair of late penalties.
Despite retreating at an alarming rate at the first two scrums, Scotland made a blistering start with ball in hand, which led to the game’s first try.
A wonderful team move, orchestrated by Finn Russell, saw Sean Maitland burst up the wing, before the forwards took the hosts into the Ireland 22.
From there, Hamish Watson’s powerful carry drew the Irish defence, allowing Russell to float a pass to Stuart Hogg, who dived over for his 14th Test try. Laidlaw converted.
The champions of 2015 responded well, and dominated both possession and territory in the rest of the opening quarter, but as it drew to a close, Scotland led 7-0.
Then, another moment of Scottish magic and no surprise it was that man Hogg who rounded off a wonderful move to score his second try of the half.
From a lineout on the Ireland 10m line, the ball was worked down the left wing by Huw Jones to Hogg, who, with only Rob Kearney to beat, sold his opposite number the dummy and sprinted clear.
Laidlaw was on target again to make it 14-0, but as they did after Hogg’s first effort, Ireland responded well.
They put together another sustained period of pressure, and with Romain Poite playing advantage, worked the ball to the left wing, where Keith Earls went over.
Paddy Jackson, who endured a horror show off the tee at Murrayfield in 2013, missed a tough conversion.
It was an exhilarating opening 40 minutes, and Scotland edged towards the first-ever Six Nations bonus point with a third try on the half hour.
A clever lineout move, with Alex Dunbar helping his pack colleagues out, saw the Glasgow Warriors centre collect the throw, and he burst through to score.
Laidlaw added the conversion from the right touchline, to give Scotland a 16-point lead.
As Ireland built pressure in the Scotland half once more, Poite awarded the visitors a penalty, allowing Jackson the chance to cut the gap, and the Ulsterman obliged (21-8).
Scotland pressed on the stroke of the break, only for a loose pass to be intercepted by Simon Zebo. The Munster wing kicked ahead, but Scotland were saved by the retreating Tommy Seymour, and Laidlaw kicked the ball to touch for half-time.
Half-time: Scotland 21-8 Ireland
Ireland started the second half strongly, and won a succession of penalties inside the Scotland half, with Rory Best turning down an opportunity to kick at the posts twice inside four minutes.
Instead, Ireland took a scrum 5m out, and that decision paid off three minutes later, when Iain Henderson barged over. Jackson converted to cut the difference to six (21-15).
Scotland nearly shot themselves in the foot for the second time, as Russell’s grubber was blocked by Conor Murray, who fed Heaslip, but the veteran number eight couldn’t find a team-mate as Sean Maitland spared his colleague’s blushes.
Rob Kearney provided Ireland with a moment of magic, as he skipped through, before offloading to Earls, but another wonderful Maitland tackle forced the full-back into touch.
The Scottish resistance finally broke with 17 minutes to play, as Jackson carved a great line and escaped the clutches of Strauss to score, before converting to give Ireland the lead for the first time (21-22).
Vern Cotter’s men were clinging on thereafter, with limited possession and no territory to speak of as Ireland took charge – albeit without adding to their total.
A rare home attack, and a huge carry by John Barclay following a similar effort by Zander Fagerson, yielded a penalty, which Laidlaw landed to give Scotland the lead once more, with just seven minutes to go.
Ireland were lucky not to lose Kearney to the sin-bin for a high tackle on Dunbar, and instead of taking the points, Russell kicked his pack to a 5m lineout as they searched for that fourth try.
Another penalty ensued, and Laidlaw sent the ball sailing through the posts to seal a famous win – a first on the opening day of the Championship since France were beaten some 11 years ago.
Full-time: Scotland 27-22 Ireland
Scotland: Stuart Hogg, Sean Maitland, Huw Jones, Alex Dunbar, Tommy Seymour, Finn Russell, Greig Laidlaw (c); Allan Dell, Fraser Brown, Zander Fagerson, Richie Gray, Jonny Gray, Ryan Wilson, Hamish Watson, Josh Strauss.
Replacements: Ross Ford (on for Brown 26), Gordon Reid (for Dell 55), Simon Berghan, Tim Swinson (on for Strauss 65), John Barclay (on for Watson 54), Ali Price, Duncan Weir (on for Russell, HIA 47-51), Mark Bennett (on for Jones 60)
Ireland: Rob Kearney, Keith Earls, Garry Ringrose, Robbie Henshaw, Simon Zebo, Paddy Jackson, Conor Murray; Jack McGrath, Rory Best (c), Tadgh Furlong, Iain Henderson, Devin Toner, CJ Stander, Sean O’Brien, Jamie Heaslip.
Replacements: Niall Scannell, Cian Healy (for McGrath 56), John Ryan (on for Furlong 68), Ultan Dillane (on for Henderson 62), Josh van der Flier (on for O’Brien 65), Kieran Marmion, Ian Keatley, Tommy Bowe (on for Earls 67)
Referee: Romain Poite
SRBlog Man of the Match: Stuart Hogg