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Answering my own question a bit, but just read this: https://www.fifa.com/technical/media-releases/semi-automated-offside-technology-to-be-used-at-fifa-world-cup-2022-tm

I get the sensors bit, that makes sense, more or less, just not sure how that data is used along with where the players are at a specific time and crucially what parts of their body are where. Would be very interesting to know exactly how this system works.

Just had a ref on ITV saying for the WC there is a chip in the ball, so for offside it is known exactly when the ball is kicked. Then using “artificial intelligence” it is known within seconds if someone is offside or not, or at least the image is available to view. Sounds all a bit bollocks to...