Painful loss for the 49ers

Safety Michael Lewis left the game in the fourth quarter with a quad strain. And backup running back Glen Coffee sustained a concussion in the fourth quarter. Those appear to be the players who might not be able to rebound for Thursday's game against the Bears. The rest of the injury report looks like this: TE Delanie Walker (left knee sprain), G David Baas (right shoulder stinger), CB Tarell Brown left ribs contusion), TE Vernon Davis (left shoulder contusion), RB Frank Gore (right eye contusion), RB Michael Robinson (right shoulder stinger), and S Curtis Taylor (right shin contusion). * * * Quarterback Alex Smith committed four turnovers. He threw three interceptions and lost one fumble. "It's very obvious what happened," coach Mike Singletary said. "I don't think our guys quit. I think the guys played hard. We didn't play very smart in terms of giving the football away. We have a formula in terms of how we play, how we win games....