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New England Patriots 14 at Buffalo Bills 10. Final.
Bills -3 upsetU 40 ✓
The verdict · 2021 Week 13
New England Patriots 14, Bills 10 — with the result never quite settled.
It turned at Q4 2:00, 4th and 14, on Josh Allen — 25.8 win-probability points to the Patriots on one snap, the largest move of the game.
The snaps that bent it
28.1 mph wind
Bills closed -3 and lost outright — an upset against the closing number.
New England Patriots 14–10. Biggest swing: Q4 2:00, Patriots +25.8% win probability on one snap. Played in 28.1 mph wind — weigh that when reading the passing lines.
The biggest swing of the game · Q4 2:00 · 4th and 14
Josh Allen
Patriots
(2:00) (Shotgun) 17-J.Allen pass incomplete deep middle to 13-G.Davis (41-M.Bryant).
25.8
win-probability points on one snap
The largest move of the game. The two below are drawn against it.
Damien HarrisPatriotsQ1 5:28(5:28) 37-D.Harris left tackle for 64 yards, TOUCHDOWN.
17.7pts
Devin SingletaryBillsQ4 3:45(3:45) (Shotgun) 26-D.Singletary left end to NE 25 for 17 yards (9-M.Judon). NE-9-M.Judon was injured during the play. M.Judon walks off.
16.9pts
What separated them
Explosive plays
Patriots won this one — 8 chunk plays, against Bills at 3 chunk plays.
Patriotsthe gap went the way the scoreboard did
Running the ball
Patriots won this one — +0.01 expected points per carry, against Bills at -0.41 expected points per carry.
Patriotsthe gap went the way the scoreboard did
Every snap
Patriots won this one — +0.01 expected points per snap, against Bills at -0.19 expected points per snap.
Patriotsthe gap went the way the scoreboard did
Red zone
Bills owned this one and still lost it — 1 touchdown on 4 trips, against Patriots at 0 touchdowns on 2 trips.
Billsthe gap went the other way from the scoreboard
1 other measure was inside a third of the league's own spread — two clubs doing the same thing, so it is not shown.
Drawn from the weekly play-by-play file, which paints on the Monday 4:00 AM ET sync after the game.
The model against the market, the momentum underneath, every drive — scrub to replay it
How the game was won
The model and the market were 2.0 win-probability points apart on the average play, and 8 apart at the widest — with the model the more convinced about Patriots.
MarketModelmodel higher on Billshigher on Patriots139 of 150 plays carry both curves
(2:00) (Shotgun) 17-J.Allen pass incomplete deep middle to 13-G.Davis (41-M.Bryant).
Swing −25.8 for BillsExpected points −2.71 for BillsModel and market agree here.play 141
The solid line is the betting market's home win probability; the dashed line is the play-by-play model's. The shaded band between them is the disagreement — emerald where the model liked the home team more, red where it liked the away team more. Drag across the curve or use arrow keys to replay the game; gold diamonds mark the biggest swings.
Highest-leverage plays
4th · 2:00NE +26% win prob(2:00) (Shotgun) 17-J.Allen pass incomplete deep middle to 13-G.Davis (41-M.Bryant).
1st · 5:28BUF +18% win prob(5:28) 37-D.Harris left tackle for 64 yards, TOUCHDOWN.
4th · 3:45BUF +17% win prob(3:45) (Shotgun) 26-D.Singletary left end to NE 25 for 17 yards (9-M.Judon). NE-9-M.Judon was injured during the play. M.Judon walks off.
1st · 2:19BUF +16% win prob(2:19) 3-M.Haack punts 54 yards to NE 18, Center-69-R.Ferguson. 1-N.Harry MUFFS catch, RECOVERED by BUF-33-S.Neal at NE 14.
4th · 7:28NE +13% win prob(7:28) 2-T.Bass 33 yard field goal is No Good, Wide Right, Center-69-R.Ferguson, Holder-3-M.Haack.
1st · 7:02NE +12% win prob(7:02) 17-J.Allen FUMBLES (Aborted) at NE 35, RECOVERED by NE-93-L.Guy at NE 31. Bad handoff to M.Breida.
3rd · 7:50
SettledThe modelled figures are the league play-by-play model's, not ours.
How the points landed
The margin ledger
Damien Harris's 64-yard rushing touchdown with 5:28 left in the 1st put New England Patriots ahead for good. The lead never changed over the 4 scores that followed.
Lead
1st5:28Damien Harris·64-yd TD run64-yard rushing touchdowntwo-point goodLead never changed again+88–0
2nd11:31Nick Folk·41-yd field goal41-yard field goalholder J.Bailey · snap J.Cardona+311–7
3rd6:39Tyler Bass·35-yd field goal35-yard field goalholder M.Haack · snap R.Ferguson+311–10
4th13:05Nick Folk·34-yd field goal34-yard field goalholder J.Bailey · snap J.Cardona+314–10
5 scores · bar length is the lead after each one
Down-to-down truth
Situational splits
Patriotscategory by categoryBills
Patriots6–3Bills
251Total yards230
5.2Yards per play4.0
40%Success rate35%
18%Third-down rate31%
0Red-zone touchdowns1
8Explosive plays3
12First downs14
0Sacks taken2
0Turnovers1
The read
Patriots ahead 6–3 on categories, but the biggest gap belongs to Bills, in red-zone touchdowns.
Expected points added, per play
The centre line is an average play. A bar to the right of it is a side that gained more than the situation was worth; a bar to the left is a side that lost ground. All six bars share one scale, ±0.41 points.
Every snapexpected points added per play, all downs
+0.01Patriots: +0.01 expected points added per play
−0.19Bills: −0.19 expected points added per play
Dropping backexpected points added per dropback
+0.01Patriots: +0.01 expected points added per play
−0.06Bills: −0.06 expected points added per play
Running itexpected points added per rush
+0.01Patriots: +0.01 expected points added per play
−0.41Bills: −0.41 expected points added per play
Neither side “wins” volume or play-calling mix, so neither is drawn as a duel: Patriots ran 48 snaps at a 6% dropback rate against Bills’s 57 at 63%. Red-zone trips: Patriots 2, Bills 4.
NotePatriots won the down-to-down efficiency fight: 0.01 expected points added per play vs -0.19.
Derived from the play-by-play, no model
The Read
6 of 8 readings cleared their snap floor and were tested against four comparisons: this week's whole slate, the team's own season, the week before, and the team's own ordinary spread. Every bar below is set in that team's own week-to-week swing, never in league points — one team's swing runs 1.6 to 3.1 times the entire league's spread.
Too few to read
2 of 8 readings cleared their snap floor in this game, which is under the three this column needs before it will draw the rule. The readings themselves stand.
lowest in the league that weekAgainst the weekOver Expected
NE's pass rate over expected, −56.7 pts, was the lowest of the 28 team-games charted in week 13 — 42.6 points clear of the next team along.
Past their previous low of −25.7 pts in week 9.
3.0 times their own weekly swing below their number.
A 3.4-swing turn from week 12.
47 snaps this game, floor 20 — 17 of their games behind the ruler, and their own week-to-week swing is 16.8 points. · −3.0σ from their own normal
lowest in the league that weekAgainst the weekTendencies
NE's early-down pass rate, 5.7%, was the lowest of the 28 team-games charted in week 13 — 23.4 points clear of the next team along.
Past their previous low of 31.0% in week 9.
2.5 times their own weekly swing below their number.
A 2.7-swing turn from week 12.
35 early downs this game, floor 15 — 17 of their games behind the ruler, and their own week-to-week swing is 17.8 points. · −2.5σ from their own normal
The season-grain rooms, pointed at this one game
Was this normal for them?
6 of 8 readings cleared their snap floor. Every deviation below is measured in that team's own game-to-game swing, not in league points — because one game's swing runs from 1.6 to 3.1 times the whole league's spread.
their week-to-week swingall 32 teams
upper band = their week-to-week swing · lower rule = all 32 teams · scale -64 pts to 38 pts
right on their number · +0.0 vs their 13.9%, and they swing ±7.4 week to week (+0.00× that swing) · 36 dropbacks
Bills—
Only 3 dropbacks tonight — too few to read a tendency. Their season number is 15.5%.
Play-action rate
Charted from 2022. The columns exist for 2021 and are entirely empty, which is not a season of data.
Blitz rate sent
Charted from 2022. The columns exist for 2021 and are entirely empty, which is not a season of data.
NoteNE's pass rate over expected was the night's one real departure: -56.7 pts, 50.5 points below their season mean of -6.2 pts and 3.0 times their own 16.8-point weekly swing.
The Game Day Roster
Who was out, who dressed and never took a snap, and who was on the field how much. Game-day list and snap counts from the weekly roster and snap feeds. Practice-squad and injured-reserve players are not shown — they were never on the game-day list.
New England Patriots
48 dressed · 6 inactive · 2 never used
76Isaiah WynnT · Every snap100%51 snaps
69Shaquille MasonG · Every snap100%51 snaps
67Ted KarrasC · Every snap100%51 snaps
77Trenton BrownT · Every snap100%51 snaps
60David AndrewsC · Every snap100%51 snaps
10Mac JonesQB · Every snap100%51 snaps
81Jonnu SmithTE · Heavy rotation76%39 snaps
38Rhamondre StevensonRB · Heavy rotation63%32 snaps
5 players played under 8 snaps, so their shares read as a dash rather than a number. 3 lines have no expected-points read and sit off the plane.
Expected points are modelled in full PPR, so the “vs expected” column stays in that unit whichever format the pills are set to. Switching the pills changes the points column, not the plane.
The field map
Every snap, where it happened
The whole game as one hundred yards. The Bills attack right, the Patriots attack left, so a change of possession is a reversal you can see. Reading down is the order the snaps were played — not the clock, so a two-minute drill gets the same room as any other fourteen snaps. This game is final.
Patriots←Bills→
Q1Q2Q3Q4
J.Allen pass−27% win probabilitymoment 4 of 4
(2:00) (Shotgun) 17-J.Allen pass incomplete deep middle to 13-G.Davis (41-M.Bryant).
Q4 2:00 · Bills · 4th & 14 at NE 18 · gained nothing · -2.71 EP · −26.9% win probability
137 snaps placed · 13 without a recorded yard line, left off the map · 4 marked moments — the largest win-probability swings, one per drive.
The Film Room · post-game
Post-game film: 150 plays across 21 drives, personnel groupings on 150 snaps. Everything here paints the morning after the week's games — there is no live play-level feed in this product, so nothing on this page updates while a game is being played.
Possession by possession
The field rail
5 of 21 drives ended in points. The longest march was NE moving 69 yards from the NE 31 for a touchdown. Each bar is the ground a drive actually covered; BUF attacks right, NE attacks left. Hatching marks a trip inside the twenty.
Every snap
Play stream
150 of 150 plays
Team
Quarter
Down
Play type
Expected points added
Event
Charted
Plays shown
150
EPA per play
-0.09
Success rate
32%
Yards
473
Who was on the field
Personnel groupings
Offensive grouping on every pass and run. A group needs five snaps in this game before it gets a number — under that the sample is a coin flip and the cell reads a dash instead. The names of the eleven on the field are only recorded from 2023 onward, so this game gives the grouping without the roster.
Bills1 RB, 1 TE, 3 WR43-0.0072%
Patriots2 RB, 1 TE, 1 WR22+0.340%
Patriots1 RB, 1 TE, 3 WR16-0.0913%
Bills1 RB, 2 TE, 2 WR8-1.1413%
Patriots1 RB, 1 TE, 2 WR6-0.4217%
Bills1 RB, 2 TE, 1 WR4——
Patriots1 RB, 2 TE, 2 WR3——
Patriots2 RB, 1 TE, 2 WR1——
Bills2 RB, 1 TE, 2 WR1——
Bills1 RB, 0 TE, 4 WR1——
snapsepapass rate
150 plays · ranked by the win probability each one moved
Every play
Ball
When
Play
Only
Who
150 plays
Bar length is win probability the play moved
1st quarter38 plays
Punt5 plays, from the Patriots 25 to the Patriots 31
Punt4 plays, from the Bills 48 to the Patriots 49
Punt4 plays, from the Patriots 20 to the Patriots 26
Offense on the fieldOne back, two tight ends and two receiversDefense on the fieldThree linemen, three linebackers and five backsIn the boxSix defenders
Fumble lost5 plays, from the Patriots 40 to the Patriots 29
FormationI formationOffense on the fieldSix linemen, two backs, one tight end and one receiverDefense on the fieldFour linemen, three linebackers and four backsIn the boxEight defenders
Patriots6Bills0
Patriots8Bills0
Touchdown4 plays, from the Patriots 31 to the Patriots 36
Punt8 plays, from the Bills 25 to the Bills 38
Patriots8Bills6
Patriots8Bills7
Touchdown2 plays
The period ended5 plays, from the Patriots 25 to the Patriots 47
2nd quarter35 plays
Patriots11Bills7
Field goal6 plays, from the Bills 47 to the Bills 23
Punt12 plays, from the Bills 25 to the Patriots 39
Punt5 plays, from the Patriots 16 to the Patriots 20
Punt4 plays, from the Bills 34 to the Bills 41
Punt7 plays, from the Patriots 25 to midfield
3rd quarter34 plays
Punt6 plays, from the Bills 25 to the Bills 41
Punt8 plays, from the Patriots 20 to the Patriots 34
FormationShotgunOffense on the fieldOne back, one tight end and three receiversDefense on the fieldTwo linemen, four linebackers and five backsIn the boxSix defendersRushing the passerFive
Patriots11Bills10
Field goal8 plays, from the Bills 37 to the Patriots 17
The period ended12 plays, from the Patriots 25 to the Bills 16
4th quarter43 plays
Patriots14Bills10
Field goal4 plays
FormationShotgunOffense on the fieldOne back, one tight end and three receiversDefense on the fieldTwo linemen, four linebackers and five backsIn the boxSix defendersRushing the passerThree
No good13 plays, from the Bills 36 to the Patriots 6
Punt4 plays, from the Patriots 23 to the Patriots 29
FormationShotgunOffense on the fieldOne back, one tight end and three receiversDefense on the fieldThree linemen, three linebackers and five backsIn the boxSix defenders
FormationShotgunOffense on the fieldOne back, one tight end and three receiversDefense on the fieldTwo linemen, four linebackers and five backsRoute runPostCoverageCover 0, no safety helpMan or zoneManIn the boxEight defendersRushing the passerSixPressure (charted)The passer was pressuredTime to throw2.7 seconds
Turnover on downs13 plays, from the Bills 20 to the Patriots 13
Turnover on downs8 plays, from the Patriots 19 to the Patriots 23
Win probability is the league play-by-play model, 98.5% of plays · a dash means none was published
The cards are drawn from the play-by-play sync, not live, and each one says so on its face.
Closing number vs result
Betting context
Closing spread
Bills -3
Closing total
40
Patriots moneyline
+132
Bills moneyline
-146
Bills closed -3 and lost outright — an upset against the closing number.
Total closed 40; the game landed 24 — under by 16.0.
Conditions and crew
Game environment
Venue
New Era Field
Roof / surface
outdoors · a turf
Kickoff weather
Cold, 36°F at kickoff; a real wind at 28 mph out of the west; 0.02 in of precipitation; slight snow.
Referee
Bill Vinovich
Rest
Patriots 8 days · Bills 11 days
Coaches
Bill Belichick vs Sean McDermott
NoteDivision game — familiarity tightens these matchups; closing numbers tend to be sharper.
NoteWind at 28.1 mph is the kind that drags passing depth and kicking range — weigh it when reading the splits.
BUF +11% win prob
(7:50) (Shotgun) 17-J.Allen scrambles right end pushed ob at NE 35 for 6 yards (8-J.Bentley). PENALTY on NE-41-M.Bryant, Unnecessary Roughness, 15 yards, enforced at NE 35.
2nd · 3:10BUF +10% win prob(3:10) 7-J.Bailey punts 46 yards to BUF 34, Center-49-J.Cardona, out of bounds.