Wales defence coach Shaun Edwards has responded to criticism that the team's 'blitz' defence was not effective in their defeat to Ireland at the weekend.
"I was happy with the blitz defence, but I wasn't happy when we didn't blitz," Edwards told BBC Sport.
"You notice from the scrum try we didn't blitz, you know people are saying the blitz defence is not working. The blitz defence works. We just need to do it at the right time."
The tactic involves defenders moving quickly towards their opponents, with the aim of closing the space.