luckadjusted

Week 17 2019 · December 29, 2019

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

Bears at Vikings, Week 17 2019: who deserved to win?

The Bears stole one. They beat the Vikings 21–19, but replayed with the way both teams actually played, the Vikings win 9 of 10. Luck ran their way: judgment calls alone were worth 3.5 points to the Bears.

The Bears won on an off day: they played far below what the matchup promised. In a fresh game against the Vikings they would win 65% of the time; with this day’s form, 9%. The numbers

Before kickoff the Bears were 66% favorites. The biggest swing (Q4, 0:12 left): E. Pineiro made 22-yard field goal, worth 47 points of win probability to the Bears.

Final

Chicago Bears 21
Minnesota Vikings 19

December 29, 2019 · U.S. Bank Stadium · Closing line: Bears −5.5

Luck index +91 Bears very lucky · −91 Vikings

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. Bears win 1, Vikings win 9.

  1. 1 CHI 22 MIN 16
  2. 2 CHI 13 MIN 15
  3. 3 CHI 13 MIN 17
  4. 4 CHI 24 MIN 31
  5. 5 CHI 16 MIN 26
  6. 6 CHI 7 MIN 20
  7. 7 CHI 14 MIN 30
  8. 8 CHI 10 MIN 29
  9. 9 CHI 7 MIN 30
  10. 10 CHI 3 MIN 33

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 Bears won on an off day

They played far below what the matchup promised. In a fresh game against the Vikings they would win 65% of the time; with this day’s form, 9%.

56 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
Bears offenseEPA per play gained +0.03 +0.07 worse by 0.05
Bears defenseEPA per play allowed +0.11 +0.03 worse by 0.08
Vikings offenseEPA per play gained +0.11 +0.13 worse by 0.02
Vikings defenseEPA per play allowed +0.03 +0.06 better by 0.03

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

Bears win 9% of them, Vikings 91%, counting the 2% still level after regulation as half each. The line is what actually happened: Bears by 2.

Show as a table
Final margin in the replaysShare of replays
Bears by 17+0.4%
Bears by 9–161.7%
Bears by 1–86.0%
Level after regulation1.8%
Vikings by 1–817.8%
Vikings by 9–1623.8%
Vikings by 17+48.6%

Where the luck was

Take the luck out

The final margin was Bears by 2. Remove the luck, one kind at a time, and it becomes Vikings by 4.1.

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.

  • E. Pineiro, 26 yds made · 98% expected
  • E. Pineiro, 33 yds made · 94% expected
  • D. Bailey, 37 yds made · 92% expected
  • E. Pineiro, 34 yds made · 94% expected
  • D. Bailey, 38 yds made · 91% expected
  • D. Bailey, 39 yds made · 90% expected
  • D. Bailey, 34 yds made · 95% expected
  • E. Pineiro, 22 yds made · 98% expected
Bar: expected chance of a make. Filled dot: made. Open dot: missed or blocked.

When it happened

Vikings’ chance of winning

As low as 0% and as high as 67%. 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 Vikings were ahead in it, below while the Bears were.
#WhenWhat happenedWin probability forNext drive
1 Q1 14:22 The Vikings fumbled and the Bears recoveredFumble bounces · loose balls are close to 50/50 +8% CHI MIN: Turnover
2 Q2 0:31 The Vikings were stopped on 3rd & 33rd & 4th downs · 50% expected +7% CHI MIN: Field goal
3 Q3 8:30 Offensive Holding on the Vikings, 10 yards, wiping out the playJudgment calls +9% CHI CHI: Turnover on downs
4 Q4 6:53 The Bears fumbled and recovered it themselvesFumble bounces · loose balls are close to 50/50 +11% CHI CHI: Turnover
5 Q4 6:25 The Bears were stopped on 3rd & 163rd & 4th downs · 18% expectedThe Bears fumbled and the Vikings recoveredFumble bounces · loose balls are close to 50/50 +42% MIN CHI: Field goal
6 Q4 2:36 The Bears converted 4th & 93rd & 4th downs · 27% expected +32% CHI CHI: Field goal
7 Q4 0:58 The Bears were stopped on 3rd & 53rd & 4th downs · 31% expected +7% MIN CHI: Field goal
8 Q4 0:12 E. Pineiro made 22-yard field goalKicks · 98% expected for him +47% CHI –

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.

  • Brian O'Neill (MIN T), out · 1.1 pts
  • Riley Reiff (MIN T), out · 0.9 pts
  • Eric Kendricks (MIN LB), out · 0.5 pts
  • Anthony Barr (MIN LB), out · 0.5 pts
  • Dalvin Cook (MIN RB), out · 0.4 pts
  • Shamar Stephen (MIN DT), out · 0.3 pts
  • Roquan Smith (CHI LB), out (IR) · 0.7 pts
  • Bobby Massie (CHI T), out · 0.7 pts
  • Rashaad Coward (CHI T), out · 0.6 pts
  • Taylor Gabriel (CHI WR), out · 0.6 pts
  • Danny Trevathan (CHI LB), out (IR) · 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

Bears 33% · Vikings 67%

Final margin
Bears by 2
Luck in points
6.1 for the Bears
Luck-adjusted margin
Vikings by 4.1
Replay with same day's form
Bears 9% · Vikings 91% 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 17 2019 games · Bears · Vikings

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