This is not a Manchester City issue. It's an issue for the game and supporters in general.
There are two main issues:
I have to wonder why the secrecy. If you want public confidence in this issue then open it up to review. Get some sports science university department on it, or some independent performance analysis team to review their process using historic samples.
One thing I learned yesterday was that in the discussion about when a ball is played, they use the first contact with the ball, not the last. That seems a bit arbitrary, but at least they have a standard. I think we were assuming it was the last.
There are two main issues:
- Precision
In the Champions League, the controversy revolved around handball and the interpretation of deliberate handballs, but now it is offside calls.
Any measurement you make is associated with error. You can call it measurement error. We have human error, systematic error, and in a marginal offside call there are two measurements:
When the ball is played, and the distance between defender and attacker. And further to that the image has to be corrected for distortion if the image is not in line. (Recall the stills of the John Stones goal-saving clearance v Liverpool which from the camera position on the half-way line looked well over the line, but on the line was shown to be good). The process is clearly complex if it's done properly, and all aspects will have systematic errors which will be compounded when combined to generate what is called error propagation.
We had several marginal offside calls in the West Ham v Manchester City game. Why don't PGMOL release their evidence? Why don't they show football fans how they arrive at their decision?
If they were open, and the system worked within an acceptable margin of error, then it might be acceptable, subject to my next point. We are not Luddites. Why the secrecy? The inability of various media organisations to recreate and substantiate the West Ham v City offside calls raises question marks against it. They are using the same system as far as I can see.
- In my opinion, even if measurement system was precise, it has to be done in real-time. Football fans are part of the game. Re-run goals over a minutes delay, and we become emotionally detached from the game.
I have to wonder why the secrecy. If you want public confidence in this issue then open it up to review. Get some sports science university department on it, or some independent performance analysis team to review their process using historic samples.
One thing I learned yesterday was that in the discussion about when a ball is played, they use the first contact with the ball, not the last. That seems a bit arbitrary, but at least they have a standard. I think we were assuming it was the last.
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