[Ref Daddy]

SECTION 39 SCREEN
ART. 1 . . . A screen is legal action by a player who, without causing contact, delays or prevents an opponent from reaching a desired position.
ART. 2 . . . To establish a legal screening position:

a. The screener may face any direction.
b. Time and distance are relevant.
c. The screener must be stationary, except when both are moving in the same path and the same direction.

ART. 3 . . . When screening a stationary opponent from the front or side, the

screener may be anywhere short of contact.

ART. 4 . . . When screening a stationary opponent from behind, the screener must allow the opponent one normal step backward without contact.

ART. 5 . . . When screening a moving opponent, the screener must allow the opponent time and distance to avoid contact. The distance need not be more than two strides.

ART. 6 . . . When screening an opponent who is moving in the same path and direction as the screener is moving, the opponent is responsible for contact if the screener slows up or stops.