By Sam Ryan It wasn't pretty, ugly in fact, but Australia did the one thing that they needed to do. They survived and now advance to a World Cup semi final against Argentina. Scotland were exceptional from the opening whistle and terribly unlucky in the end. Brutal in defence, accurate in attack and opportunistic at every moment. Australia were the contrary. I guess one positive Michael Cheika can take from the match, is that the Wallabies now know exactly what not to do in a knockout match of a World Cup. The other, was Bernard Foley once again proving his worth in the moments that matter, despite a disappointing overall night with the boot. But then there was the rest. Chip kicks, intercepts and poor ruck defence, there was enough to age Michael Cheika a generation. With his two biggest weapons in the stands, Cheika’s Wallabies produced a sub par performance for the second straight week, but still did just enough to claim victory, just enough to survive and advance. And at