Skill Positions
X: Outside receiver, typically on the weak side. Often a deep threat or primary target.
Y: Tight end or slot receiver, typically on the strong side. Often involved in blocking or short routes.
H: Slot receiver or hybrid back. Versatile and often used in motion or misdirection plays.
Z: Outside receiver, typically on the strong side. Complementary to the X receiver.
R: Running back or additional blocker, often lined up in the backfield or motioned out.
Blocking Schemes
Zone: This is a running block scheme focused on blocking areas or "zones", allowing the ball carrier to read and cut.
Trap: This is a running block scheme for the backside guard to pull and "trap" the play-side defensive tackle when running to the 1 or 2 hole.
Power: Run block scheme with a pulling backside guard when attacking the 3 or 4 hole.
Counter: This is a running block scheme for running plays giving way to misdirection and always contains pulling the backside guard when running to the 5 or 6 hole.
Toss: This is a running block scheme with the play-side guard pulling around the end to lead the way on a toss play to the 7 or 8 hole.
BoB: Big on Big. This is pass protection with the lineman dropping back picking up defenders.
Slide: This is for sprint outs, roll outs, etc. The linemen "slide" to the left or right depending on which way the QB is rolling out.