Former New Zealand and Argentina rugby coach Alex Wyllie hopes the All Blacks' recent industrious scrummaging sessions bear reward as they contemplate meeting the Argentine pack in today's quarter-final.
Los Pumas are formidable in that department with veterans like prop Rodrigo Roncero and hooker Mario Ledesma relishing the wrestle at set piece contact. Lock Patricio Albacete has also impressed as the epicentre of their pack, and as a future leader.
It is understood the All Blacks had some brutal live sessions building up to the French game - when they were based in Christchurch beforehand - and the quarter-finals. With trainings largely private it has been hard to gauge but they are also believed to have upped the intensity against Canada by concentrating on keeping scrums up against a weaker pack. Working on stability rather than aggression can have benefits. It prevents a referee penalising the attacking team in collapse situations where calls can become 50:50.
Wyllie has a fair idea how to deal with Argentina. He coached them from 1996-1999, a period which included wins over England, Australia, Scotland as well as beating Ireland at the 1999 World Cup to take them into their first quarter-final.
"They look like they've got size and weight in the scrum. They're big but they've got to get mobile as well. They also need to worry about the mind games. In my experience they look up to the All Blacks so there's a worry they don't believe they can win.