In reply to Coel Hellier:
> You mean you can actually tell which of the two front rows is the one at fault??? Wow!!
Well, yes. I played across the front row at schools level and, being somewhat undersized, needed to understand technique more than powering through.
Once you identify the suspicion it's happening, you can stop trying to watch everything else and just watch the prop swing his hips out. The loss of shape in the opposition front row follows.
Even without the question if "who bores first", it's pretty easy to diagnose ifvtge tighthead is driving the hooker and not the loosey. It's a simple question of who's advantaged. In particular, there's no benefit to the hooker driving on the prop - you just loose your shape (which is a significant disadvantage) without really benefiting from any disruption of the opposition. Conversely, as a prop driving in the hooker you really snarl up the opposition's two - even with a strong second row to compensate for the hooker, it just tends to encourage them to buckle. (This is particularly unpleasant). At the same time, it forces the tighthead out and they will need to attempt a counter-bore to compensate. Again, you lose the support of your second row because it requires an extreme angle and disrupts your binding badly and so you end up at a disadvantage.
It seems that many just like to revert to the same old argument that the scrum's an impossibility. With a good viewing position, though, it's not hard to figure out. International refs should get more support from TV officials on this count.
I'd tend to agree that most scrum penalties should be free kicks (as they used to be) but refs increasingly interpret in favour of a balanced outcome. When they can't tell what's going on, they reset. The prifessional scrum is healthier than it has been for a few seasons and it'd probably benefit the game if lawmakers held off going in and blindly fumbling the rules (again). I think it's recognition of this that means feeds aren't heavily policed as it allows a highish completion rate without over many penalties