PIck and Roll - Illegal Screen

[SNIPERBBB]

You can screen legally while moving.

[Jay R]

If you go the NBA Video Rulebook, there are 3 or 4 good examples of illegal screens on pick and rolls. No, we're not in the NBA but video examples of good screens versus bad screens may help you figure where to draw the line.

[bob jenkins]

You need to decide if the "roller" is illegally screening the defensive player who's going under, or if both players are legally moving and contact occurs. Look for an arm out to hold the defensive player, or a change in the movement to stay in front, ...

I know that's not much help. Most moves are (interpreted as) legal -- you'll know the illegal when you see it.

[just another ref]

The only thing that keeps many screens from being illegal is that the defender sees the screen and shies away from the contact.

[ballgame99]

The judgement that needs to be made here is whether the "roller" is really rolling to try to receive a pass or go rebound, or if he/she is just rolling enough to hold up the defender. You can usually tell the diference.

[Camron Rust]

Originally Posted by ballgame99

The judgement that needs to be made here is whether the "roller" is really rolling to try to receive a pass or go rebound, or if he/she is just rolling enough to hold up the defender. You can usually tell the diference.

Why the "roller" is rolling is irrelevant. It is the effect of the action that matters. If the defender attempts to go under and the roller moves such that it cuts them off and prevents them from getting to the player they were trying to guard, it is an illegal screen (assuming contact). Of course, if the shot or pass is already in motion, that might change things as the play to be defended will have changed.