We've been told by our fellow board officials (MA high school) who have received guidance from their college boards that the "interpretation" shall be that the unrestricted linemen are the snapper and the 2 linemen either side of the snapper. That will mean when we have an unbalanced line with the TE in the 2nd position that the TE is unrestricted and the 3rd lineman on the other side (a number 50-79) would be restricted.
3 2 1 0 1 2
L L L S L TE