“If I can play this game, I’m going to play,” Purdy said on Tuesday. Purdy was initially hurt during San Francisco’s Week 1 victory over the Seahawks and missed the next two games. San Francisco coach Kyle Shanahan said pain tolerance is only part of the decision regarding Purdy. Whoever plays quarterback for San Francisco might have limited weapons at his disposal. The 49ers badly want to beat the Rams, who swept San Francisco last season and have won the past three meetings.