Video assistant referee systems can deliver mixed results for soccer fans. They might slow down the place of play and nudge referees to make harsher calls.Lucas Uebel/Getty ImagesWhen Liverpool and Norwich face off today in the season-opening match of the Premier League, fans in England may see a bit of tradition slip away. No longer will the referees act as the all-seeing, all-knowing gods of the pitch. They'll have a team of second-guessers watching from above—the video assistant referee, or VAR. Despite major hiccups at the Women's World Cup earlier this summer, and studies showing that the VAR system slows down the most beautiful game, the Premier League is set to finally institute video review. It is the last major soccer league to do so.At nearly $6 billion in annual revenue, the Premier League is one of the world's richest sports organizations, so the consequences to a team for a referee's penalty can be huge. Teams that lose and tumble in the standings get sent down to a lower-level league the following season. Playing in a lower league means less revenue for the team and the players. To try to get the calls right, Premier League officials spent two years figuring out how to make the video system work properly. Still, expect some weird stuff to happen on the field during this weekend's matches.”I have no doubt it will create some controversy because it is about the big decisions, but we are prepared for that,” interim league chief executive Richard Masters told the BBC.The video assistant referee system, also known as VAR, adds a fifth official to the field along with a referee, an assistant referee, and two linesmen. That person—awkwardly also called the VAR—sits in a booth and monitors feeds from the multiple commercial broadcast cameras set up around the field to cover the match. If there's some doubt over a penalty, goal, or offsides call, the video assistant referee can review the play and then signal to the referee on the field to take a look at an image of the play on a screen on the sideline. After reviewing the play in real time or slow motion, the referee decides whether to change his decision. (At least in the Premier League, all referees are male.)At least, that's how it's supposed to work. At the recent Women's World Cup, however, players and coaches were upset that the video system was being applied to minor infractions, such as the rarely enforced rule that goalkeepers must stay on their line during a penalty kick. Others complained that VAR should have been used when it wasn't, or that it didn't help referees make close calls.While most VAR calls only take a minute or so on the field, some decisions have taken longer and slowed the pace and rhythm of a fast-moving and momentum-driven sport.Two years ago, US referee Carlos Salazar had a pretty rough afternoon with VAR. He was the first Major League Soccer referee to use video review technology, during the second half of a match between FC Dallas and the Philadelphia Union on August 5, 2017.“I made the first mistake,” says Salazar, a longtime MLS on-field referee who now works in the upstairs booth as a video assistant referee, about his initial call.In the game, Salazar initially signaled a goal for Dallas forward Maxi Urruti. Then the video review began, but the technology didn't work seamlessly. The radio connection between Salazar and the VAR booth failed, so the crew had to communicate to a sideline official through a walkie-talkie, and then to Salazar on the field. After several minutes of back-and-forth discussion and after reviewing what happened on the field, he ended up overturning his decision. It turned out that Urruti had kicked the goalkeeper in the groin before striking the ball, a clear and obvious foul.“It felt like you had some egg on your face,” Salazar says about his initial bad call. “Nobody wants to be wrong.” Salazar says it took him about a dozen games to get comfortable asking for a video review on a controversial play. “If we can get through the game without going to the monitor, that's a successful day,” he says.Right now in MLS, referees do video reviews about every third game. A study published last month by researchers at Spain's University of Vigo found that using VAR slowed down first-half play in Italian and German professional soccer leagues, although players adapted in the second half by committing fewer fouls. Compared to earlier seasons, the number of offsides, penalties and yellow cards dropped after video review was introduced.Another team of sports scientists, at Katholieke Universiteit Leuven, in Belgium, has been analyzing thousands of video plays over the past two years in several European soccer leagues. They found that VAR raised the accuracy of “match-changing” referee calls from 92 to 98 percent, according to Jochim Spitz, a research analyst in KU Leuven's Department of Movement Science. “It was a big improvement,” says Spitz, who is reviewing the calls as part of a research project with the International Football Association Board, which sets rules for all pro soccer leagues.Spitz says soccer referees' decision-making skills are influenced by the speed of play. They are more likely to call a harsher foul against a player when they watch a replay in slow motion. To test his theory, Spitz and his team sent video clips to nearly 90 refs in five countries, as described in a paper published last year in the journal Cognitive Research. Refs who watched the replays in slow motion were more likely to issue a red card, which leads to a player getting kicked out for the rest of the match, than a warning yellow card.The MLS's Salazar argues that slow motion should only be used to determine where a ball hits a player on the body or on the field, not how hard one player tackles another. Salazar says he expects his colleagues in the Premier League will do fine this weekend with the first day of VAR, but the players, coaches, managers, and fans have to accept the technology as well.“Those officials will have a tough time if people do not embrace it,” he says.At least one purist says VAR has removed a part of soccer's unexpected and inherently unfair spirit. By relying on video technology rather than the human biases of a ref, the game is slower and less emotional. It also gives an edge to the more powerful, wealthy teams over weaker, poorer teams. “The problem with the VAR system is that you make the game more fair,” says Kjetil Kåre Haugen, a sports management expert at Norway's Mölde University College. “The more fair the sport is, the more it benefits the better teams.”Haugen laid out his argument in a paper in the OA Journal – Sports. Haugen contends that the reason people watch sports, and why businesses invest in it, is the uncertainty of the outcome of each game. VAR, he argues, negatively affects this uncertainty outcome. But that isn't stopping him from watching the Premier League play this weekend.More Great WIRED StoriesThe weird, dark history of 8chan and its founder8 ways overseas drug manufacturers dupe the FDAListen, here's why the value of China's yuan really mattersA Boeing code leak exposes security flaws deep in a 787The terrible anxiety of location sharing apps🏃🏽‍♀️ Want the best tools to get healthy? 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