"All-But-One"

[Bill D]

Actually, the all but one principle means "all fouls are enforced from the basic spot except one (a foul by the offense behind the basic spot).

The end of the (related) run you used in your definition is the basic spot for a running play. The basic spot for loose ball plays is the previous spot (which you used in your example one).

Your example two is correct IF the holding by B occured during the running play, ie after A recieves the pass. If the holding occured during the loose ball play (snap through completion of the forward pass), the penalty would be assessed from the previous spot.

Your example three is an example of the "but one". Here there is a foul by the offense apparently behind the basic spot. I say "apparently" because as in example two, you have to know when A88 held. Was it during the loose ball play or the running play. Once you know this you define the basic spot and therefore you can determine whether the foul is behind the basic spot.