Excellent! Thank you.
Your post made me want to go and start doing some research of my own. I noticed there is actually an error with the Dolphins game in the second half. The Dolphins failed on third down four times out of ten.
1. Dolphins punted on their first possession.
2. Dolphins failed to convert on third down at the beginning of the third quarter, resulting in a FG attempt that was blocked and returned for a TD.
3. The Dolphins next possession ended with the Dolphins turning the ball over on downs.
4. The Dolphins final possession ended on a third-down throw that was intercepted by Page.
Source:
http://library.kraftsportsgroup.com/20101004_gamebook.pdf (PDF)
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In any case, let's move on to the good stuff. I want to take a look at the games I mentioned because at one point in each of those games, the Pats held a lead that was at least 2+ scores.
Cincinnati @ Patriots
The Pats went into the second half against Cincinnati with a 24-3 lead.
Cincinnati outscored Pats 24-14 and were 6/8 on third downs.
Source:
http://library.kraftsportsgroup.com/20100912_gamebook.pdf (PDF)
Patriots @ Miami
The Pats went into the second half against Miami down 7-6. As we all know, Tate ran the kickoff back for a TD, making it 13-7. The next defensive series saw the Dolphins go three-and-out. The Pats next drive made it 20-7 with 12:50 left in the third quarter. From this point, the Dolphins converted on 6/9 third down attempts.
Source:
http://library.kraftsportsgroup.com/20101004_gamebook.pdf (PDF)
Patriots @ San Diego
The Pats went into the second half up 13-3 over the Chargers. More specifically, they went into the 4th quarter up 20-3, though the first play of the fourth quarter was a Charger FG, making it 20-6. During the fourth quarter, the Chargers were 3/5 on third downs.
Source:
http://library.kraftsportsgroup.com/20101024_gamebook.pdf (PDF)
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Let's take a look at the closer games.
Patriots @ New York Jets
The largest lead of the game for the Pats was seven points during the second quarter. The first half was not particularly good for the Pats on third down, giving up 3/5 third down plays when the game was close. The second half was a little better as far as third down chances went, and while the defense did go 3/8 officially, one of the third down chances was a kneel down at the end of the game. I'm going to go the honest route and call it 3/7. The Pats were 6/12 on third downs in this game, and some of them were very costly.
Source:
http://library.kraftsportsgroup.com/20100919_gamebook.pdf (PDF)
Buffalo @ Patriots
This game was close until the end, though Buffalo got a garbage time TD to make the final score close. So there will be two breakdowns here. While the game was within two scores, the Bills converted 4/9 third down chances. However, the Bills did convert their only third down chance after the Pats had gone up by two scores.
Source:
http://library.kraftsportsgroup.com/20100926_gamebook.pdf (PDF)
Baltimore @ Patriots
This game stayed within two scores the entire time. During the first three-plus quarters of the game, the Ravens converted 4/10 third downs. When the Pats finally got the tie, the Ravens only converted 1/5 third downs against the defense.
Source:
http://library.kraftsportsgroup.com/20101017_gamebook.pdf (PDF)
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BOTTOM LINES
Third down defense when behind:
9/18, 50%
Third down defense when playing with less than 2 score lead:
14/28, 50%
Third down defense when playing with more than 2 score lead:
16/23, 70%
If one excludes the second half of the Jets game and the fourth quarter of the Chargers game, the defense has allowed 5/14 (36%) third downs to be converted when defending a less than 2 score lead.
There is a definite trend to let up when up by two scores. I might do an analysis of whether or not the drives are longer as a result to determine if this is a strategy by BB to run out the clock, but for now, I'll have to say that the third down defense takes a hit.
Overall, the third down defense needs to improve, but I think we're seeing some growth, especially during the Ravens game.