WHEN THE RAVENS RUN THE BALL: Ray Rice is the name everyone recognizes because he’s Baltimore’s lead back and has great ability to pop a big play. But keep an eye out for Bernard Pierce. He’s Baltimore’s change-of-pace runner and that change is a bigger, stronger version of Rice with the ability to break a long run as he did in the playoff win over Indianapolis when he had a 43-yard run. Pierce is averaging 6.3 yards per carry in the playoffs — better than either Rice or the 49ers’ Frank Gore. The 49ers were among the league’s elite defenses in the regular season, and one reason is they stop the run. They were fourth best in the NFL in that category, allowing 94.2 yards per game. The 49ers enjoy forcing their opponents into a pass-oriented approach so they can unleash Aldon Smith and Justin Smith on the quarterback. But when teams are able to work play-action, as the Ravens like to do, it stalls the Niners pass rush. That’s the reason it is important for the Ravens to remain balanced, and to do that, they must run effectively. ADVANTAGE: Baltimore.