luckadjusted

Week 7 2019 · October 20, 2019

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

Saints at Bears, Week 7 2019: who deserved to win?

The Saints beat the Bears 36–25, and it was no fluke: replayed with the way both teams actually played, the Saints win 10 of 10. The Bears had the bounces: kicks alone were worth 7.1 points to the Bears.

An off day for the Bears: their offense and defense both played far below their usual level. In a fresh game against the Saints they would win 47% of the time; with this day’s form, 1%. The numbers

Before kickoff the Bears were 62% favorites. The biggest swing (Q1, 3:14 left): Return touchdown by the Bears, worth 13 points of win probability to the Bears.

Final

New Orleans Saints 36
Chicago Bears 25

October 20, 2019 · Soldier Field · Closing line: Bears −4

Luck index +1 Saints about even · −1 Bears

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. Saints win 10, Bears win 0.

  1. 1 NO 50 CHI 7
  2. 2 NO 36 CHI 3
  3. 3 NO 42 CHI 13
  4. 4 NO 29 CHI 3
  5. 5 NO 47 CHI 25
  6. 6 NO 23 CHI 3
  7. 7 NO 25 CHI 10
  8. 8 NO 29 CHI 17
  9. 9 NO 34 CHI 27
  10. 10 NO 16 CHI 13

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.

An off day for the Bears

Their offense and defense both played far below their usual level. In a fresh game against the Saints they would win 47% of the time; with this day’s form, 1%.

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

UnitThis gameUsual levelBetter or worse than usual
Saints offenseEPA per play gained +0.18 +0.15 better by 0.02
Saints defenseEPA per play allowed −0.33 +0.10 better by 0.42
Bears offenseEPA per play gained −0.33 +0.12 worse by 0.45
Bears defenseEPA per play allowed +0.18 +0.04 worse by 0.14

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

Saints win 99% of them, Bears 1%. The line is what actually happened: Saints by 11.

Show as a table
Final margin in the replaysShare of replays
Saints by 17+84.0%
Saints by 9–1611.5%
Saints by 1–83.0%
Level after regulation0.1%
Bears by 1–81.0%
Bears by 9–160.3%
Bears by 17+0.0%

Where the luck was

Take the luck out

The final margin was Saints by 11. Remove the luck, one kind at a time, and it becomes Saints by 20.3.

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.

  • E. Pineiro, 46 yds made · 79% expected
  • W. Lutz, 39 yds made · 89% expected
  • W. Lutz, 42 yds missed · 85% expected
  • W. Lutz, 52 yds missed · 69% expected
  • W. Lutz, 30 yds made · 96% expected
Bar: expected chance of a make. Filled dot: made. Open dot: missed or blocked.

When it happened

Bears’ chance of winning

As low as 0% and as high as 59%. 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 Bears were ahead in it, below while the Saints were.
#WhenWhat happenedWin probability forNext drive
1 Q1 13:37 Illegal Bat on the Bears (Pat O'Donnell), 0 yardsJudgment calls · 0 flags in 59 snaps before, position avg 1 per 885Blocked punt by the SaintsSpecial teams +8% NO NO: Punt
2 Q1 5:29 The Bears fumbled and the Saints recoveredFumble bounces · loose balls are close to 50/50 +7% NO CHI: Touchdown
3 Q1 3:19 The Saints converted 3rd & 73rd & 4th downs · 27% expected +8% NO NO: Touchdown
4 Q1 3:14 Return touchdown by the BearsSpecial teams +13% CHI CHI: Touchdown
5 Q1 0:43 The Bears converted 3rd & 83rd & 4th downs · 29% expected +8% CHI CHI: Field goal
6 Q2 2:22 W. Lutz missed 42-yard field goalKicks · 85% expected for him +12% CHI NO: Punt
7 Q3 10:22 W. Lutz missed 52-yard field goalKicks · 69% expected for him, 4 of 5 from 45+ before +8% CHI NO: Touchdown
8 Q3 9:30 The Bears were stopped on 3rd & 43rd & 4th downs · 42% expected +7% NO CHI: Punt

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.

  • Kyle Long (CHI G), out (IR) · 0.5 pts
  • Akiem Hicks (CHI DT), out (IR) · 0.5 pts
  • Jared Cook (NO TE), out · 0.8 pts
  • Trey Hendrickson (NO DE), out · 0.6 pts
  • Alvin Kamara (NO RB), out · 0.5 pts
  • Tre'Quan Smith (NO WR), 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

Saints 100% · Bears 0%

Final margin
Saints by 11
Luck in points
9.3 for the Bears
Luck-adjusted margin
Saints by 20.3
Replay with same day's form
Saints 99% · Bears 1% 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 7 2019 games · Saints · Bears

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