Of the Springbok field portfolios that have been examined in the Rugby Championship and the friendly against Argentina, the attacking and defensive ones have undergone most scrutiny. With a new centre combination that has eased the pain of Jean de Villiers' injury worries, backs coach Ricardo Loubscher has been able to breathe more easily.There are questions over the Bok attack against evolved defences, but Loubscher felt most boxes had been ticked ahead of their opening World Cup game against Japan on September 19 in Brighton."We'll find out over the next two weeks if all our boxes have been ticked. From a backs point of view, the biggest lesson we learnt in the Rugby Championship was the maximal use of opportunities. If you go back to the New Zealand and Australia games, they were decided by small margins. We know we are creating opportunities, but the most important thing is being able to finish them," Loubscher said."Another lesson taken from the Durban loss to Argentina was adapting to conditions and the referee. They gave us a lesson in terms of using their available opportunities and the best thing was that in our last game we didn't concede any tries. That was a massive improvement from our side."The improvement has been noticed by defence coach John McFarland, as the Bok defence was pounded in the Rugby Championship. Defence is the cornerstone of successful assault, but the peaking of a defensive system can only be measured in knockout games when the margins are small.Those who were part of the 2011 World Cup campaign ended by the Wallabies will know how one defensive lapse can change a game...