The rack at nine ball has turned into a huge problem for the game starting in about 2000. If the rack is really tight, the wing balls are dead. If the rack is not tight, it is not fair to the breaker. A solution to this dilemma is to move the rack up the table so the wing ball is harder to make from a tight rack. I think the real solution is to move on to some other game, such as 10 ball, but some events have tradition keeping them with 9 ball, such as the US Open. The other large change to the break is that it alternates, usually.