“You will be not offside if any part of the body that can score a goal is in line with the last defender, even if other parts of the attacker’s body are in front. That will sort it out and
you will no longer have decisions about millimeters and a fraction of the attacker being in front of the defensive line.”
-- Former Arsenal manager
Arsene Wenger, now
FIFA’s chief of global football development, on his proposal to shift the benefit of the doubt back in favor of the attacker on close offside decisions. IFAB will meet in Belfast on Feb. 29 to
vote on the law change, which needs six votes out of eight to pass. (FIFA holds four of the votes while the other four are held by football associations of England, Scotland, Wales and Northern
Ireland.)
(talkSPORT)
That leaves only the arms.
I think daylight between the torsos would be the easiest to distinguish as offside (and if the AR is not sure, they're onside).
I could go for that Kent, compared to what they're doing now. Once upon a time when I was a striker, it was torso, didn't need to be daylight, just fractionally, but when in doubt, onside.
What he is proposing is that the entire body has to be past the defender to be in an offside position. (The arms are not going to be the trailing behind the legs when someone is running.)