100 - 900 Formations
The 100 or 900 formations place the wing with the TE and the spread end splits at a distance of 10-12 yards from the tackle opposite the wing. This split is used when the establishing of a blocking angle is not of primary concern or when forcing a four deep secondary to invert. The spread end should never be closer than five yards from the sideline.
Red - Blue
The formations that are named with colors ("Red", "Blue" etc.) are formations that place both of the halfbacks in wing positions
Orange - Black
When we need an unbalanced look with everyone spread and eligible, we go to our trips look. This is when the non called side Half back is in wing position but on the line of scrimmage. This is called Orange or Black - Color for one back and both HB's are in wing positions and Orange - Right and Black - left.
Right 100 - Left 900
The terms "Right" and "Left" as a prefix creates an unbalanced line by bringing an end over to the designated side. This can also be done by keeping the ends normal and bring a tackle over to the designated side which is called "Tackles Right" or "Tackles Left."
Tight 100 - Tight 900 Formations
When wishing to create a formation with two tight ends the prefix "Tight" is used and this positions the spread end (or a second TE) in the TE position.
Split 100 - Split 900 Formations
When you wish to create an additional blocking angle at the flanK the formations may be modified with the term "Split" which alters the spread end's alignment. This call reduces the width of the spread end to four to six yards from the offensive tackle.
Spread 100 - Spread 900 Formations
When the spread end splits beyond ten yards to the side of the wing, this is referred to as "Spread" formation.
Slot 100 - Slot 900 Formations
When wishing to create an additional blocking angle at the flank to the wing the spread end will assume his "Slot" position. The spread end "Slot" position splits him from six to eight yards from the tackle to the side of the wing.
Pro 100 - Pro 900
The term "Pro" as a prefix splits both the spread end and the wing in wide positions.
200 - 800 Formations
The term 200 or 800 moves the Tailback to a position straddling the guard's outside leg on the wing side. This gives you power at the flank and the possibility of flooding the wing side with three receivers.
300 - 700 Formations
The term 300 or 700 moves a halfback across the formation as a dive back to the wing back side. This formation is used to overload a defense with extra blockers or to flood a side with receivers. These formations give you a bunch passing game.
X 100 - X 900
The term "X" preceding the formation places the tailback in a normal wing position opposite the wing, while the dive back remains in his dive back position.