The impact of the rule may not be immediate, because if a perimeter defender believes his man isn't a threat from the longer distance, he may still feel free to leave him to double-team in the low post. Over time, though, the new line should push players to diversify their skills. Players who can no longer shoot the three will be forced to drive the lane or attempt more medium-range jump shots.

Two other rule changes should help players do both of those things. First, defenders will no longer be permitted to keep a forearm on their man when he is facing the basket, which should make it easier for an offensive player to create his shot. Second, there will be a dotted semicircle beneath each basket, marking a four-foot arc within which defenders are not able to draw charging fouls in most half-court situations. "We feel it will encourage perimeter players to drive to the basket," Thorn says of the latter new rule. "Players will be able to show off their full complement of moves."

With these changes, the league has made a few good moves of its own.

—Phil Taylor