NEW YORK — The NHL's new rule banning blindside hits to the head is called "Rule 48."

It easily could be named after victims David Booth and Marc Savard, or offenders Mike Richards and Matt Cooke, who might be the last players to get away with such shots unscathed.

For the first time, a lateral or blindside hit on an opponent in which the head is targeted or is the main area of impact will not only be subject to supplemental discipline, but a major penalty and ejection from the game.

Players have had only last season's playoffs and one exhibition season to alter their play and keep their shoulders away from the head when they hit an unsuspecting opponent.

"We've seen a couple of blindside hits, shoulder to shoulder, shoulder to chest, that are still legal," league disciplinarian Colin Campbell said. "I can't tell you that I've seen exactly a player who's tried to avoid it. Hopefully they are avoiding it."

Savard is still bothered by the effects of a concussion he sustained March 7 when he was hit from behind by Pittsburgh's Cooke. Savard missed the rest of the regular season and didn't return to the Bruins' lineup until the first game of Boston's second-round playoff series against Philadelphia.

Booth, a Florida Panthers forward, missed 45 games because of a concussion he received after Richards' blindside hit in Philadelphia on Oct. 24.

"As the players got bigger, the hits became more frequent," Campbell said. "We took a look at this as our concussion study was taking place. The (general managers) said, 'Enough. We have to do something about these concussions.' Certainly that got us going. We were going to do something about it."

The board of governors, general managers and the league's competition committee unanimously agreed that these specific hits no longer had a place in the game, but they stopped short of eliminating all head contact.

"The hitter really has to be cognizant of where he's coming from and where the contact is going to be made with the player," said Terry Gregson, the NHL's director of officiating. "There's still going to be contact with the head. If it's coming from the blindside, my guys are to penalize that player.

"We can't lose sight of the fact there's going to be elbowing majors to the head and things like that. Those don't go out the window. I don't want guys to morph to this rule every time there's contact with the head."