Perhaps the most shocking example of this de-evolution in NFL strategy is the man who has long represted the ideal of aggressive fourth-down decision making: Bill Belichick. Last year during the regular season, the Patriots didn’t attempt a single run or pass play on fourth-and-2, and they went for it only two times out of eight opportunities in long field-goal range (between the 31- and 37-yard lines). This trend carried over into the playoffs; against Baltimore, the Patriots had fourth-and-2 twice and settled for a punt and a 31-yard field goal. They also punted twice in long field-goal range, although these were “no man’s land” situations, i.e. not just in deep field-goal range but in deep field-goal range on fourth-and-long when none of the options are mathematically any good. As a result, Belichick ranks a shocking 23rd out of 34 head coaches in Aggressiveness Index for 2012. This is a massive change from most of Belichick’s career. Belichick has the fifth-highest career AI of any head coach with at least three full seasons between 1991 and 2012, and he ranked in the top six for AI every year between 2004 and 2010 before falling to 11th in 2011 (although he was sixth in 2011 in the older version of AI). 2012 was only the third season out of 18 when Belichick ranked in the bottom half of the league; the others were 1994 (0.76 AI, 21st) and 2003 (.84 AI, 23rd).