Two tactics have pulled in opposite directions. One team emptied the circle almost completely, leaving two players in it and six spread across a wide shape outside the 25, so play was pushed out and the ball came back to a two against two. The other, which India used, packs five or six bodies around the penalty spot, forcing a man-marking side to choose who stays free. Watch the full masterclass: Long Corner Defence.
Every training session, is the short answer, with a minimum of about 20 minutes a week given to it. Browne runs it as a competition rather than a walk-through, stopping and starting when there is a point to make. Free hits inside the 25 get the same treatment, because he sees them as a chance to score rather than a restart to survive. Watch the full masterclass: Long Corner Defence.
Whatever system a young side ends up playing, Browne would put one on one defending first. The game moves quickly enough that closing down, and using body, stick and feet to win a one against one, matters more early on than the label on the structure. From there he drip-feeds the group work, turning it into two against one and reading where the real danger is. Watch the full masterclass: Long Corner Defence.