How Liverpool, Brentford are staying ahead of the Premier League when it comes to corners

It's time for some game theory. Every week, it seems like another Premier League team is hiring another set-piece coach. At this point, it's just malpractice not to have one. The most generous estimates suggest that they could be worth as many goals as an £80 million striker, adding something like an extra 0.75 goals per game to a team's full-season tally. But even the least generous estimate suggests they're worth it.