St. Louis Rams quarterback Sam Bradford throws during the first quarter of an NFL football game against the San Francisco 49ers Sunday, Dec. 2, 2012, in St. Louis. (AP Photo/Jeff Roberson)

San Francisco 49ers running back Frank Gore, left, scores on a 1-yard run past St. Louis Rams linebacker Josh Hull during the first quarter of an NFL football game on Sunday, Dec. 2, 2012, in St. Louis. (AP Photo/Tom Gannam)

San Francisco 49ers running back Frank Gore (21) gets past St. Louis Rams free safety Quintin Mikell on his way to a 23-yard gain during the first quarter of an NFL football game on Sunday, Dec. 2, 2012, in St. Louis. (AP Photo/Tom Gannam)

San Francisco 49ers quarterback Colin Kaepernick, center, is sacked for a 7-yard loss by St. Louis Rams outside linebacker Jo-Lonn Dunbar, bottom, and defensive end William Hayes, top, during the first quarter of an NFL football game on Sunday, Dec. 2, 2012, in St. Louis. (AP Photo/Tom Gannam)

San Francisco 49ers quarterback Colin Kaepernick (7) throws to fullback Bruce Miller, left, during the first quarter of an NFL football game against the St. Louis Rams, Sunday, Dec. 2, 2012, in St. Louis. (AP Photo/Tom Gannam)

San Francisco 49ers quarterback Colin Kaepernick is sacked for a 7-yard loss by St. Louis Rams outside linebacker Jo-Lonn Dunbar (58) and defensive end William Hayes, right, during the first quarter of an NFL football game Sunday, Dec. 2, 2012, in St. Louis. (AP Photo/Seth Perlman)

San Francisco 49ers outside linebacker Aldon Smith, center, sacks St. Louis Rams quarterback Sam Bradford, left, for a 6-yard loss while Rams tackle Barry Richardson, right, tries to block Smith during the second quarter of an NFL football game Sunday, Dec. 2, 2012, in St. Louis. (AP Photo/Tom Gannam)

St. Louis Rams kicker Greg Zuerlein (4) watches his 54-yard field goal during overtime of an NFL football game against the San Francisco 49ers, Sunday, Dec. 2, 2012, in St. Louis. The field goal gave the Rams a 16-13 victory. (AP Photo/Jeff Roberson)

St. Louis Rams kicker Greg Zuerlein, (4) makes a 54-yard field goal as San Francisco 49ers' Tramaine Brock, left, watches during overtime of an NFL football game, Sunday, Dec. 2, 2012, in St. Louis. The Rams won 16-13. (AP Photo/Tom Gannam)

St. Louis Rams quarterback Sam Bradford, right, hugs teammate Austin Pettis after their 16-13 win over the San Francisco 49ers in overtime of an NFL football game on Sunday, Dec. 2, 2012, in St. Louis. (AP Photo/Seth Perlman)

San Francisco 49ers kicker David Akers, left, and St. Louis Rams' Janoris Jenkins react after Akers missed a 51-yard field goal attempt in overtime of an NFL football game, Sunday, Dec. 2, 2012, in St. Louis. The Rams won 16-13. (AP Photo/Jeff Roberson)

St. Louis Rams kicker Greg Zuerlein (4) is congratulated by Johnny Hekker, left, after making a 54-yard field goal to defeat the San Francisco 49ers 16-13 in overtime of an NFL football game, Sunday, Dec. 2, 2012, in St. Louis. Running past are Rams' Matthew Mulligan (82) and Tim Barnes (61). (AP Photo/Tom Gannam)

San Francisco 49ers quarterback Alex Smith (11) watches from the sidelines during overtime of an NFL football game against the St. Louis Rams, Sunday, Dec. 2, 2012, in St. Louis. The Rams won 16-13. (AP Photo/Tom Gannam)

St. Louis Rams kicker Greg Zuerlein smiles after kicking a 54-yard field goal to defeat the San Francisco 49ers 16-13 in overtime of an NFL football game on Sunday, Dec. 2, 2012, in St. Louis. (AP Photo/Tom Gannam)

St. Louis Rams tight end Lance Kendricks, left, runs past San Francisco 49ers inside linebacker Patrick Willis to score on a two-point converstion during the fourth quarter of an NFL football game, Sunday, Dec. 2, 2012, in St. Louis. The Rams won 16-13 in overtime. (AP Photo/Jeff Roberson)

San Francisco 49ers quarterback Colin Kaepernick, right, tries to toss the ball to teammate Ted Ginn as St. Louis Rams' Quintin Mikell (27) defends during the second half of an NFL football game on Sunday, Dec. 2, 2012, in St. Louis. The play was ruled a fumble, recovered by Rams' Janoris Jenkins who took it in for a touchdown. (AP Photo/Seth Perlman)

St. Louis Rams cornerback Janoris Jenkins smiles after recovering a fumble by San Francisco 49ers quarterback Colin Kaepernick and taking it in for a touchdown during the second half of an NFL football game, Sunday, Dec. 2, 2012, in St. Louis. The Rams won 16-13 in overtime. (AP Photo/Seth Perlman)

St. Louis Rams running back Steven Jackson, left, runs with the ball for a 22-yard gain as San Francisco 49ers cornerback Carlos Rogers defends during the third quarter of an NFL football game, Sunday, Dec. 2, 2012, in St. Louis. The Rams won 16-13 in overtime. (AP Photo/Jeff Roberson)

St. Louis Rams quarterback Sam Bradford (8) is hit by San Francisco 49ers cornerback Carlos Rogers after scrambling for a 6-yard gain during the third quarter of an NFL football game, Sunday, Dec. 2, 2012, in St. Louis. The Rams won 16-13 in overtime. (AP Photo/Jeff Roberson)

St. Louis Rams tight end Lance Kendricks (88) leaps over San Francisco 49ers inside linebacker Patrick Willis (52) to score on a two-point conversion during the fourth quarter of an NFL football game, Sunday, Dec. 2, 2012, in St. Louis. The Rams won 16-13 in overtime. (AP Photo/Tom Gannam)

San Francisco 49ers wide receiver Ted Ginn is unable to pick up a fumble by quarterback Colin Kaepernick during the second half of an NFL football game against the St. Louis Rams, Sunday, Dec. 2, 2012, in St. Louis. Rams' Janoris Jenkins recovered the fumble and took it in for a touchdown. (AP Photo/Seth Perlman)

ADVANCE FOR WEEKEND EDITIONS, DEC 8 -9 - FILE - In this Dec. 2, 2012, file photo, San Francisco 49ers kicker David Akers (2) reacts to a missed field goal during overtime of an NFL football game against the St. Louis Rams in St. Louis. (AP Photo/Tom Gannam, File)

FILE - In this Dec. 2, 2012 file photo, San Francisco 49ers quarterback Alex Smith warms up as 49ers head coach Jim Harbaugh, left, stands nearby before the start of an NFL football game against the St. Louis Rams in St. Louis. A person with knowledge of the trade tells The Associated Press that the Kansas City Chiefs have agreed to acquire Smith from San Francisco. The person spoke on condition of anonymity on Wednesday, Feb. 27, 2013, because the trade does not become official until March 12, when the NFL's new business year begins. (AP Photo/Tom Gannam, File)