Saw this on reddit today
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https://www.youtube.com/watch?v=eU3ldfqCVXw
2021 FIFA Congress
at the 1hr 15 minutes of the video, FIFA president Infantino said:
The current offside rule says that "if any part of your body with which you can score a goal is over the line of the second last defender then it is offside."
We are testing the opposite rule so to saying "if any part of your body with which you can score a goal is in line with the second last defender then it is not offside."
In the Premier League last year, there were 4 offside situations per game, with this new rule, two of these 4 situations would be onside and maybe a few more goals.
We need to see what kind of impact this new rule have on the game and that is why we are testing it currently in America and in China. Professor Arsene Wenger is supervising this work.