Wow, that’s quite a question and I’ll try to keep my response under 10 pages.
Let’s start with situational coaching. If you’ve ever played football you know that the game is a lot more chaotic when you’re on the field than when you’re watching from the stands. You’re constantly in a state of motion, getting play calls, executing the play, then getting back to the huddle. Often times it’s easy to lose perspective on what the situation is -how much time is left, what the score is, are we playing safe or aggressive?
Belichick’s style really prepares his team for this by constantly throwing new and different situations at his players in practice. The net result is a team that almost always does the right thing, even when strange and unexpected things happen. Usually, the Patriots are calm among that chaos and that has won them their fair share of football games.
He also aids this by finding smart football players, who can think on a macro level, rather than just those who get the play call, run the play, move to the next play.
Now, because this is how they build and craft their defense, it’s tough judge them based on straight-up stats, so I prefer to look at Football Outsiders’ DVOA rankings, which measure play-specific efficiency. Here are the Pats’ defensive rankings over the last four seasons:
- 2009: 14th
- 2010: 21st
- 2011: 30th
- 2012: 15th
- 2013: 8th (thru 7 weeks)