This was a coaching master-class from Warren Gatland. He has been in charge of Wales for 10 years now — as well as his time with Ireland and the Lions — and knows how to turn things on their head, which is exactly what he did to inspire a stunning win.
Gatland knew exactly how Scotland would attack and try to keep the tempo high, so he called their bluff. In the first half in particular Wales kicked very long but deliberately to keep the ball in play.
You might think with Scotland's dangerous back three, and a general desire to counter-attack and keep the game fluid, that such tactics could be dangerous.
But Wales backed it up with a superbly organised kick-chase and very solid tackling, with their two centres to the fore. They shepherded the dangerous Scotland attackers into exactly the positions they were happiest defending against them. Very clever.
Gatland's other masterstroke — and this was my one worry ahead of what most pundits believed to be a 50-50 game — was to give the large Scarlets contingent their head.