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Good luck escaping from either of these defenses.
One of the many things these two defenses have in common is that they rarely miss tackles.
According to Pro Football Focus, the 49ers have missed 40 tackles in 2012—the fifth-lowest total in the NFL. Only Houston, with 32 missed tackles, has whiffed less than the Bears, who have 36.
It's more than just proper tackling technique behind these impressive numbers, though. Both the 49ers and Bears have defenses laden with All-Pro talent that play fast, physical and smart. They play extremely instinctual football and rarely get caught out of position.
Defensive coordinator Vic Fangio deserves a ton of credit for bringing the 49ers' defense along in his complex defensive schemes so quickly. He's done so without allowing the fundamentals to slip out of view in the process.
Fangio arrived with Harbaugh prior to the 2011 season, and though he inherited a defense loaded with talent, few coordinators would have been able to accomplish so much in such a short amount of time.
High-flying defenses such as these often make opposing offenses extremely uneasy, leading to conservative play-calling which results in more of a slow-paced chess match as opposed to a shootout.