The call was the right one...
"Nov 16, 2009
Belichick's 4th Down Decision vs the Colts
New England coach Bill Belichick is taking a lot of heat for his decision to attempt a 4th down conversion late in the game against the Colts. Indianapolis came back to win in dramatic fashion. Was the decision a good one?
With 2:00 left and the Colts with only one timeout, a successful conversion wins the game for all practical purposes. A 4th and 2 conversion would be successful 60% of the time. Historically, in a situation with 2:00 left and needing a TD to either win or tie, teams get the TD 53% of the time from that field position. The total WP for the 4th down conversion attempt would therefore be:
(0.60 * 1) + (0.40 * (1-0.53)) = 0.79 WP
A punt from the 28 typically nets 38 yards, starting the Colts at their own 34. Teams historically get the TD 30% of the time in that situation. So the punt gives the Pats about a 0.70 WP.
Statistically, the better decision would be to go for it, and by a good amount. However, these numbers are baselines for the league as a whole. You'd have to expect the Colts had a better than a 30% chance of scoring from their 34, and an accordingly higher chance to score from the Pats' 28. But any adjustment in their likelihood of scoring from either field position increases the advantage of going for it. You can play with the numbers any way you like, but it's pretty hard to come up with a realistic combination of numbers that make punting the better option. At best, you could make it a wash."
The spot by the Side Judge was susect. Belichick has his guys convinced that 4th down is really third down. An important mindset that instills confindence in his team. Belichick goes on 4th down almost more than any other coach, and from anywhere on the field and has about an 80% success rate.
If he gave the ball back to Indy with 2 minutes left the outcome would have been the same.
The real question is why did Brady take a time out when they were beginning that drive after having just taken the ensuing kick. That wasted time out could have been used to challenge the spot.
Here are the links to the quote....
http://http://www.advancednflstats.com/2009/11/belichicks-4th-down-decision-vs-colts.html
http://http://www.advancednflstats.com/2009/09/4th-down-study-part-1.html