[BillyMac]

Originally Posted by Kansas Ref

... in NF there is no goal-tending if for example during a layup try: the ball contacts the backboard and while on the way "up" (ascending), then defender blocks it before it begins the descending motion toward the rim. This is simply, a blocked shot/good defense. Of course when no call is made, one can oft hear the players, coaches, and fans expressions of "displeasure".

Great point Kansas Ref.

The backboard has nothing to do with goaltending. Goaltending is when a player touches the ball during a try, or tap, while it is in its downward flight, entirely above the basket ring level, outside the imaginary cylinder above the ring, and has the possibility of entering the basket. On most layups, the ball is going up immediately after it contacts the backboard. It is legal to pin the ball against the backboard if it still on the way up, and is not in the imaginary cylinder above the basket.