A 46-yard pass from Colin Kaepernick to Kyle Williams quickly placed the 49ers on the Denver 25-yard line. Then, two passes of 7 and 11 yards to Anthony Dixon helped San Francisco set up from the 3-yard line with a first-and-goal.
Defensive tackle Mitch Unrein made two straight tackles on running plays and rookie linebacker Steven Johnson hit Rock Cartwright in the backfield to force San Francisco to settle for a 21-yard field goal.
The 49ers have scored on all three second-half possessions and now trail 24-23. David Akers is 3-of-3 on the day.