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DYNATYZE
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Los Angeles Rams 10 at San Francisco 49ers 31. Final.
Rams -3.5 upset
The verdict · 2021 Week 10
San Francisco 49ers 31, Rams 10 — and it was over early.
It turned at Q1 0:58, 3rd and 11, on Jimmie Ward — 12.9 win-probability points to the 49ers on one snap, the largest move of the game.
The snaps that bent it
U 50 ✓
Rams closed -3.5 and lost outright — an upset against the closing number.
San Francisco 49ers 31–10 — never really in doubt late. Biggest swing: Q1 0:58, 49ers +12.9% win probability on one snap.
The biggest swing of the game · Q1 0:58 · 3rd and 11
Jimmie Ward
49ers
(:58) (Shotgun) 9-M.Stafford pass short right intended for 89-T.Higbee INTERCEPTED by 1-J.Ward at LA 27. 1-J.Ward for 27 yards, TOUCHDOWN.
12.9
win-probability points on one snap
The largest move of the game. The two below are drawn against it.
Deebo Samuel49ersQ2 8:23(8:23) (Shotgun) 10-J.Garoppolo pass short middle to 19-D.Samuel to LA 44 for 20 yards (33-N.Scott). Caught at SF 40. 16-YAC
7.2pts
Kendall Blanton49ersQ2 0:18(:18) (Field Goal formation) 6-J.Hekker pass short right to 86-K.Blanton to SF 15 for 2 yards (93-D.Jones) [29-T.Hufanga]. Caught at SF 21. 6-YAC
7.6pts
What separated them
Throwing the ball
49ers won this one — +0.77 expected points per dropback, against Rams at -0.26 expected points per dropback.
49ersthe gap went the way the scoreboard did
Third down
49ers won this one — 8 of 14 on third down, against Rams at 3 of 10 on third down.
49ersthe gap went the way the scoreboard did
Every snap
49ers won this one — +0.16 expected points per snap, against Rams at -0.22 expected points per snap.
49ersthe gap went the way the scoreboard did
Giveaways
49ers won this one — no giveaways, against Rams at 2 giveaways.
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 officially scored play-by-play, which lands usually within two hours of the final, or the next morning when its release runs late.
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 8.5 win-probability points apart on the average play, and 23 apart at the widest — with the model the more convinced about 49ers.
MarketModelmodel higher on 49ershigher on Rams153 of 161 plays carry both curves
(:58) (Shotgun) 9-M.Stafford pass short right intended for 89-T.Higbee INTERCEPTED by 1-J.Ward at LA 27. 1-J.Ward for 27 yards, TOUCHDOWN.
Swing +12.9 for 49ersExpected points +6.22 for 49ersThe model had 49ers 17 points higher than the market did.play 31
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
1st · 0:58LA +13% win prob(:58) (Shotgun) 9-M.Stafford pass short right intended for 89-T.Higbee INTERCEPTED by 1-J.Ward at LA 27. 1-J.Ward for 27 yards, TOUCHDOWN.
2nd · 0:18LA +8% win prob(:18) (Field Goal formation) 6-J.Hekker pass short right to 86-K.Blanton to SF 15 for 2 yards (93-D.Jones) [29-T.Hufanga]. Caught at SF 21. 6-YAC
2nd · 8:23SF +7% win prob(8:23) (Shotgun) 10-J.Garoppolo pass short middle to 19-D.Samuel to LA 44 for 20 yards (33-N.Scott). Caught at SF 40. 16-YAC
2nd · 13:20SF +7% win prob(13:20) (Shotgun) 9-M.Stafford pass short middle to 89-T.Higbee for 10 yards, TOUCHDOWN.
1st · 7:51SF +6% win prob(7:51) 25-E.Mitchell left tackle to LA 43 for 3 yards (50-E.Jones; 91-G.Gaines). PENALTY on LA-52-T.Lewis, Defensive Offside, 5 yards, enforced at LA 46 - No Play.
1st · 5:07SF +6% win prob(5:07) (Shotgun) 10-J.Garoppolo pass short middle to 85-G.Kittle to LA 26 for 7 yards (24-T.Rapp, 51-T.Reeder). Caught at LA 29. 3-YAC
SettledThe modelled figures are the league play-by-play model's, not ours.
How the points landed
The margin ledger
George Kittle's 8-yard touchdown catch with 1:59 left in the 1st put San Francisco 49ers ahead for good. The lead never changed over the 6 scores that followed.
Lead
1st1:59George Kittle·8-yd TD catch8-yard touchdown catchfrom Jimmy Garoppolofrom Jimmy GaroppoloLead never changed again+70–7
3rd4:43Robbie Gould·50-yd field goal50-yard field goalholder M.Wishnowsky · snap T.Pepper+37–24
4th11:15Deebo Samuel·40-yd TD catch40-yard touchdown catchfrom Jimmy Garoppolofrom Jimmy Garoppolo+77–31
4th3:52Matt Gay·37-yd field goal37-yard field goalholder J.Hekker · snap M.Orzech+310–31
7 scores · bar length is the lead after each one
Down-to-down truth
Situational splits
Ramscategory by category49ers
Rams0–849ers
278Total yards336
5.1Yards per play5.3
37%Success rate44%
30%Third-down rate57%
1Red-zone touchdowns2
5Explosive plays5
13First downs19
2Sacks taken1
2Turnovers0
The read
49ers ahead 8–0 on categories, including the biggest gap of the duel — turnovers.
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, ±0.77 points.
Every snapexpected points added per play, all downs
−0.22Rams: −0.22 expected points added per play
+0.1649ers: +0.16 expected points added per play
Dropping backexpected points added per dropback
−0.26Rams: −0.26 expected points added per play
+0.7749ers: +0.77 expected points added per play
Running itexpected points added per rush
−0.03Rams: −0.03 expected points added per play
−0.1349ers: −0.13 expected points added per play
Neither side “wins” volume or play-calling mix, so neither is drawn as a duel: Rams ran 54 snaps at a 81% dropback rate against 49ers’s 63 at 32%. Red-zone trips: Rams 4, 49ers 3.
Note49ers won the down-to-down efficiency fight: 0.16 expected points added per play vs -0.22.
Derived from the play-by-play, no model
The Read
6 of 7 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.
−2.5σtheir own normal+2.5σ
One dot per reading, placed at how far it sits from that club's own normal in that club's own standard deviations. 6 of 7 readings cleared their snap floor.
lowest in the league that weekAgainst the weekTendencies
SF's early-down pass rate, 21.3%, was the lowest of the 28 team-games charted in week 10 — 16.2 points clear of the next team along.
Past their previous low of 45.5% in week 1.
A 4.0-swing turn from week 9.
47 early downs this game, floor 15 — 17 of their games behind the ruler, and their own week-to-week swing is 14.2 points. · −2.0σ from their own normal
high through week 10Against their seasonTendencies
LA's early-down pass rate, 78.6%, is past their previous high of 71.4% in week 9 — the highest of their 10 charted games through week 10.
2.1 times their own weekly swing above their number.
42 early downs this game, floor 15 — 17 of their games behind the ruler, and their own week-to-week swing is 9.6 points. · +2.1σ from their own normal
low through week 10Against their seasonOver Expected
SF's pass rate over expected, −18.9 pts, is past their previous low of −11.7 pts in week 7 — the lowest of their 9 charted games through week 10.
A 3.6-swing turn from week 9.
63 snaps this game, floor 20 — 17 of their games behind the ruler, and their own week-to-week swing is 7.2 points. · −1.7σ from their own normal
LA's sack or hit rate, 5.0%, is past their previous low of 7.7% in week 4 — the lowest of their 10 charted games through week 10.
A 3.3-swing turn from week 9.
20 dropbacks this game, floor 12 — 17 of their games behind the ruler, and their own week-to-week swing is 4.6 points. · −1.7σ 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 -25 pts to 18 pts
leaned — stayed blocked · −7.7 vs their 12.7%, and they swing ±4.6 week to week (−1.67× that swing) · 20 dropbacks
49ers9.1%
inside their normal wobble · −6.7 vs their 15.8%, and they swing ±6.7 week to week (−1.00× that swing) · 44 dropbacks
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.
NoteLA's early-down pass rate was the night's one real departure: 78.6%, 20.3 points above their season mean of 58.2% and 2.1 times their own 9.6-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.
2 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 49ers attack right, the Rams 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.
Rams←49ers→
Q1Q2Q3Q4
M.Stafford pass−9% win probabilitymoment 2 of 4
(:58) (Shotgun) 9-M.Stafford pass short right intended for 89-T.Higbee INTERCEPTED by 1-J.Ward at LA 27. 1-J.Ward for 27 yards, TOUCHDOWN.
Q1 0:58 · Rams · 3rd & 11 at LA 24 · gained nothing · -6.22 EP · −8.8% win probability
151 snaps placed · 10 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: 161 plays across 19 drives, personnel groupings on 161 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
6 of 19 drives ended in points. The longest march was SF moving 93 yards from the SF 7 for a touchdown. Each bar is the ground a drive actually covered; SF attacks right, LA attacks left. Hatching marks a trip inside the twenty.
Every snap
Play stream
161 of 161 plays
Team
Quarter
Down
Play type
Expected points added
Event
Charted
Plays shown
161
EPA per play
-0.00
Success rate
40%
Yards
613
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.
Rams1 RB, 1 TE, 3 WR52-0.1481%
49ers1 RB, 1 TE, 3 WR30+0.6250%
49ers2 RB, 1 TE, 2 WR23-0.1922%
49ers1 RB, 2 TE, 2 WR6-0.580%
49ers2 RB, 2 TE, 1 WR4——
Rams1 RB, 2 TE, 2 WR1——
Rams0 RB, 2 TE, 0 WR1——
snapsepapass rate
161 plays · ranked by the win probability each one moved
Every play
Ball
When
Play
Only
Who
161 plays
Bar length is win probability the play moved
1st quarter36 plays
Intercepted5 plays, from the Rams 25 to the Rams 42
Rams049ers6
Rams049ers7
Touchdown20 plays, from the 49ers 7 to the Rams 7
Rams049ers13
Touchdown5 plays
Rams049ers14
The period ended4 plays, from the Rams 25 to the Rams 31
2nd quarter35 plays
Rams649ers14
Rams749ers14
Touchdown6 plays, from the Rams 47 to the 49ers 10
Rams749ers20
Rams749ers21
Touchdown15 plays, from the 49ers 9 to the Rams 8
Turnover on downs12 plays, from the Rams 21 to the 49ers 15
The period ended2 plays
3rd quarter41 plays
Punt6 plays, from the 49ers 23 to the 49ers 44
Punt4 plays, from the Rams 20 to the Rams 25
Rams749ers24
Field goal12 plays, from the 49ers 37 to the Rams 28
Punt5 plays, from the Rams 25 to the Rams 31
Punt9 plays, from the 49ers 27 to the 49ers 45
Punt4 plays, from the Rams 9 to the Rams 15
4th quarter49 plays
Rams749ers30
Rams749ers31
Touchdown9 plays, from the 49ers 44 to the Rams 40
Turnover on downs18 plays, from the Rams 21 to the 49ers 7
Punt6 plays, from the 49ers 11 to the 49ers 12
Rams1049ers31
Field goal7 plays, from the Rams 48 to the 49ers 8
Turnover on downs7 plays, from the Rams 44 to the Rams 29
The period ended2 plays
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 charted play-by-play, not live, and each one says so on its face.
Closing number vs result
Betting context
Closing spread
Rams -3.5
Closing total
50
Rams moneyline
-177
49ers moneyline
+158
Rams closed -3.5 and lost outright — an upset against the closing number.
Total closed 50; the game landed 41 — under by 9.0.
Conditions and crew
Game environment
Venue
Levi's Stadium
Roof / surface
outdoors · grass
Kickoff weather
Cool, 60°F at kickoff; still at 3 mph out of the north-west; overcast.
Referee
Shawn Smith
Rest
Rams 8 days · 49ers 8 days
Coaches
Sean McVay vs Kyle Shanahan
NoteDivision game — familiarity tightens these matchups; closing numbers tend to be sharper.
1st · 10:26SF +5% win prob(10:26) (Shotgun) 10-J.Garoppolo pass short right to 85-G.Kittle pushed ob at SF 40 for 18 yards (4-J.Fuller). Caught at SF 27. 13-YAC
2nd · 6:15SF +5% win prob(6:15) (Shotgun) 10-J.Garoppolo pass short left to 11-B.Aiyuk to LA 8 for 21 yards (24-T.Rapp). Caught at LA 20. 12-YAC