PASS OFFENSE: Poor protection by the offensive line contributed mightily to Colin Kaepernick's career-worst passing game. Constantly flushed from the pocket, Kaepernick (13-of-28, 127 yards) wasn't exempt from blame, especially with three interceptions and a lost fumble on a sack. The Seahawks and Richard Sherman wisely blanketed Anquan Boldin, who made only a fourth-quarter catch. Kyle Williams had a team-high four catches for 39 yards.

Grade: F

RUN OFFENSE: The 49ers managed a robust 5.0 yards per carry. Don't let that fool you. Kaepernick scrambled for 87 yards. The backs: Frank Gore (nine carries, 16 yards), Anthony Dixon (4-yard carry) and Kendall Huner (7-yard loss). The Seahawks whipped the 49ers' heralded front. Left guard Mike Iupati got pancaked and committed a false start during an alarming, three-snap sequence.

Grade: D

PASS DEFENSE: Not sure which was uglier, Nnamdi Asomugha's 40-yard pass interference penalty with the score 12-3, or Marshawn Lynch's wide open touchdown catch. Aldon Smith's two sacks were offset by a silly penalty for slapping a Seahawk's helmet. A dismal second half overshadowed earlier efforts, when Russell Wilson completed just 1-of-9 passes out of the gate and had one intercepted by Eric Reid.

Grade: B-

RUN DEFENSE: Giving up 172 rushing yards isn't a 49ers-esque night. Lynch broke through for two second-half touchdown runs and totaled 98 yards. Starting nose tackle Ian Williams is lost for the season with a broken ankle, and the 49ers will need to monitor Eric Reid's concussion and Ray McDonald's ankle sprain.


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Grade: C+

SPECIAL TEAMS: Craig Dahl's blocked punt on Seattle's first series came after an apparent fake whistle from the crowd that deceived the Seahawks' blockers. That series started after a 33-yard punt return by Golden Tate. Perrish Cox fumbled away a fourth-quarter kickoff, potentially costing him that new role.

Grade: C-

COACHING: Are the Seahawks really 26 points better? They sure are in Seattle, where the 49ers' offensive game plan proved no match under hostile conditions, including a no-huddle attack early on and a 3-of-12 effort on third downs. The 49ers lost their composure far too often, as reflected by 121 penalty yards, the most under coach Jim Harbaugh.

Grade: D