luckadjusted

Week 8 2019 · October 27, 2019

No FTN charting for this game (drops and interception-worthy throws are not modelled).

Seahawks at Falcons, Week 8 2019: who deserved to win?

The Seahawks beat the Falcons 27–20, but the Falcons played well enough to win it: they take 6 of 10 replays with the same day's form. Luck ran their way: kicks alone were worth 7.0 points to the Seahawks.

The Seahawks won on an off day: they played far below what the matchup promised. In a fresh game against the Falcons they would win 72% of the time; with this day’s form, 37%. The numbers

Before kickoff the Seahawks were 71% favorites. The biggest swing (Q2, 15:00 left): M. Bryant missed 51-yard field goal, worth 10 points of win probability to the Seahawks.

Final

Seattle Seahawks 27
Atlanta Falcons 20

October 27, 2019 · Mercedes-Benz Stadium · Closing line: Seahawks −7.5

Luck index +63 Seahawks very lucky · −63 Falcons

Each team’s own plays from this game, resampled into new drives 4,000 times: with the way both teams actually played, how often does this performance win? How the replay works

Ten replays. Seahawks win 4, Falcons win 6.

  1. 1 SEA 37 ATL 17
  2. 2 SEA 20 ATL 10
  3. 3 SEA 31 ATL 25
  4. 4 SEA 23 ATL 21
  5. 5 SEA 20 ATL 23
  6. 6 SEA 23 ATL 28
  7. 7 SEA 20 ATL 28
  8. 8 SEA 28 ATL 42
  9. 9 SEA 21 ATL 39
  10. 10 SEA 30 ATL 55

Three other ways to ask

Each answers a different question, so none of them replaces the replay above.

The closing betting line, turned into a probability. What everyone knew before the game.

The line plus what this game showed, weighted by how much one game can tell. It stays close to the line because one game says little.

Every kick, fumble bounce, drop, conversion and judgment call redrawn; everything else fixed. The narrowest view of luck.

The Seahawks won on an off day

They played far below what the matchup promised. In a fresh game against the Falcons they would win 72% of the time; with this day’s form, 37%.

35 points apart for the Seahawks: the gap is how differently this game went from what the two teams usually are.

UnitThis gameUsual levelBetter or worse than usual
Seahawks offenseEPA per play gained +0.23 +0.12 better by 0.11
Seahawks defenseEPA per play allowed +0.21 +0.12 worse by 0.09
Falcons offenseEPA per play gained +0.21 +0.14 better by 0.07
Falcons defenseEPA per play allowed +0.23 +0.18 worse by 0.05

EPA (expected points added) per play on competitive snaps, turnovers left out because they are valued as luck. Usual level: the team’s earlier games this season plus half of last season, pulled toward the league average. One team’s defense and the other team’s offense are the same snaps, so one game can’t fully say whose day it was; it shows how far this one was from both teams’ norms.

How 4,000 replays ended

Seahawks win 37% of them, Falcons 63%, counting the 3% still level after regulation as half each. The line is what actually happened: Seahawks by 7.

Show as a table
Final margin in the replaysShare of replays
Seahawks by 17+5.4%
Seahawks by 9–169.5%
Seahawks by 1–819.8%
Level after regulation2.8%
Falcons by 1–824.6%
Falcons by 9–1618.5%
Falcons by 17+19.4%

Where the luck was

Take the luck out

The final margin was Seahawks by 7. Remove the luck, one kind at a time, and it becomes Falcons by 6.1.

Each row takes one kind of luck out of the margin. Color shows which team it helped. Luck shares are the fitted ones (how much of each component is luck).

The kicks

How likely each kicker was to make that kick (his own record, the distance and the weather), and what happened.

  • J. Myers, 42 yds made · 83% expected
  • M. Bryant, 51 yds missed · 67% expected
  • M. Bryant, 53 yds missed · 63% expected
  • M. Bryant, 47 yds made · 72% expected
  • J. Myers, 54 yds made · 61% expected
  • M. Bryant, 37 yds made · 90% expected
Bar: expected chance of a make. Filled dot: made. Open dot: missed or blocked.

When it happened

Falcons’ chance of winning

As low as 0% and as high as 60%. Numbers mark the biggest luck moments, listed below.

nflfastR’s in-game win probability. It ignores the betting line, so it starts near even. Shaded above the middle while the Falcons were ahead in it, below while the Seahawks were.
#WhenWhat happenedWin probability forNext drive
1 Q1 13:09 The Seahawks converted 3rd & 13rd & 4th downs · 77% expected +5% SEA SEA: Field goal
2 Q1 10:02 The Falcons converted 3rd & 53rd & 4th downs · 43% expected +5% ATL ATL: Punt
3 Q1 6:08 Offensive Holding on the Seahawks, 10 yardsJudgment calls +7% ATL ATL: Missed field goal
4 Q2 15:00 M. Bryant missed 51-yard field goalKicks · 67% expected for him, 2 of 4 from 45+ before +10% SEA ATL: Turnover
5 Q2 10:26 The Falcons converted 4th & 13rd & 4th downs · 75% expected +6% ATL ATL: Turnover
6 Q2 9:42 Offensive Pass Interference on the Falcons (Julio Jones), 10 yards, wiping out the playJudgment calls · 0 flags in 349 snaps before, position avg 1 per 331 +10% SEA SEA: Touchdown
7 Q4 13:42 The Falcons converted 3rd & 73rd & 4th downs · 35% expected +6% ATL ATL: Turnover
8 Q4 12:57 The Falcons fumbled and the Seahawks recoveredFumble bounces · loose balls are close to 50/50 +6% SEA ATL: Touchdown

Missing players

Key players (usually on the field for half the snaps or more) who missed this game or part of it, valued by position and quality. The same players are missing in every replay, so this counts as luck in points only.

  • Matt Ryan (ATL QB), out, replaced by m.schaub · 2.9 pts
  • Desmond Trufant (ATL CB), out · 0.9 pts
  • James Carpenter (ATL G), out · 0.4 pts
  • Keanu Neal (ATL FS), out (IR) · 0.4 pts
  • Tre Flowers (SEA CB), out · 0.5 pts
  • Will Dissly (SEA TE), out (IR) · 0.4 pts
  • Quinton Jefferson (SEA DT), out · 0.3 pts

Adjust the assumptions

Disagree with how much of a fumble bounce or a pass interference call is luck? Change it and the coin-flip replay reruns in your browser.

Only coin-flips re-rolled

Seahawks 36% · Falcons 64%

Final margin
Seahawks by 7
Luck in points
13.1 for the Seahawks
Luck-adjusted margin
Falcons by 6.1
Replay with same day's form
Seahawks 37% · Falcons 63% unchanged: why
How much of each is luck?

0% treats it as skill, 100% as pure luck. The tick is our fit.

What counts

We tested momentum on 19,000 lucky breaks and found none, so it's off by default. Why

Flip a play

Force the other outcome, in this game and in every replay: a made kick becomes a miss, a stop becomes a conversion, a flag goes the other way.

About these numbers

Play-by-play and win probability from nflfastR via nflverse; kicks valued against each kicker’s own record; drops and interception-worthy throws from FTN charting (not available for this game); injuries from snap counts and injury reports. No FTN charting for this game (drops and interception-worthy throws are not modelled).

Methodology and validation · All Week 8 2019 games · Seahawks · Falcons

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