A 74th minute Johnny Sexton penalty preserved an injury-hit Ireland's unbeaten RBS 6 Nations home record under Joe Schmidt and stalled Wales' stirring fightback to ensure both sides left Dublin with an equal share of the points on offer.
England launched the Eddie Jones era by emerging from a tricky RBS 6 Nations opener against Scotland at Murrayfield with a 15-9 victory founded on a dominant second half.
A late Jules Plisson penalty spared France and new head coach Guy Noves an early embarrassment as France rebounded from an eight-point deficit to beat Italy 23-21 in the opening match of the RBS 6 Nations.
South Africa-born flanker CJ Stander will make his international debut for his adopted Ireland in Sunday's RBS 6 Nations opener against Wales, with Sean O'Brien and Rob Kearney joining a further seven Irish stars ruled out the game with injury.
England's RBS 6 Nations clash with Scotland will reach a new frontier when British astronaut Tim Peake tunes in to Saturday's Calcutta Cup match from space.
It says everything about Wales' plentiful back-row resources that Justin Tipuric has not started a Test match in the RBS 6 Nations Championship for two years.
In our latest 'Emerging Talent' article, we spoke Loughborough Students player Ben Christie on his choice to play for Scotland, despite being born England ahead of the U20 Six Nations Championships.
Scotland skipper Greig Laidlaw risked re-living the Dark Blues' painful World Cup exit by watching a re-run of the controversial defeat to Australia - but instead came away with a new sense of hope.
Liam Williams is set to be involved in Wales' RBS 6 Nations opener against Ireland on Sunday - despite only playing marginally over an hour of rugby since last year's World Cup.
Luke Fitzgerald will miss the RBS 6 Nations in its entirety after a "fairly innocuous but very unfortunate" knee ligament injury has ruled him out of action for up to the next two months.