luckadjusted

Week 4 2019 · September 29, 2019

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

Vikings at Bears, Week 4 2019: who deserved to win?

The Bears beat the Vikings 16–6 and were the better team on the day: replayed with the same form, they win 6 of 10. The Vikings had the bounces: judgment calls alone were worth 2.6 points to the Vikings.

Before kickoff it was a pick’em. The biggest swing (Q1, 1:00 left): Offensive Pass Interference on the Bears (Allen Robinson), 10 yards, wiping out the play, worth 12 points of win probability to the Vikings.

Final

Minnesota Vikings 6
Chicago Bears 16

September 29, 2019 · Soldier Field · Closing line: Vikings −1

Luck index +39 Bears lucky · −39 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. Vikings win 4, Bears win 6.

  1. 1 MIN 22 CHI 3
  2. 2 MIN 21 CHI 10
  3. 3 MIN 30 CHI 23
  4. 4 MIN 10 CHI 7
  5. 5 MIN 20 CHI 22
  6. 6 MIN 17 CHI 21
  7. 7 MIN 19 CHI 26
  8. 8 MIN 3 CHI 13
  9. 9 MIN 16 CHI 31
  10. 10 MIN 6 CHI 26

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.

How 4,000 replays ended

Vikings win 39% of them, Bears 61%, counting the 3% still level after regulation as half each. The line is what actually happened: Bears by 10.

Show as a table
Final margin in the replaysShare of replays
Vikings by 17+5.1%
Vikings by 9–1612.9%
Vikings by 1–819.2%
Level after regulation3.3%
Bears by 1–830.0%
Bears by 9–1617.6%
Bears by 17+11.9%

Where the luck was

Take the luck out

The final margin was Bears by 10. Remove the luck, one kind at a time, and it becomes Bears by 12.3.

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, 25 yds made · 98% expected
  • E. Pineiro, 38 yds made · 89% expected
  • E. Pineiro, 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

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 Vikings were.
#WhenWhat happenedWin probability forNext drive
1 Q1 12:19 Defensive Holding on the Vikings, 5 yards, wiping out the playJudgment calls +9% CHI CHI: Touchdown
2 Q1 10:52 The Bears were stopped on 3rd & 13rd & 4th downs · 73% expected +5% MIN CHI: Touchdown
3 Q1 10:14 The Bears converted 4th & 13rd & 4th downs · 72% expected +8% CHI CHI: Touchdown
4 Q1 6:54 The Vikings converted 3rd & 83rd & 4th downs · 27% expected +6% MIN MIN: Punt
5 Q1 1:00 Offensive Pass Interference on the Bears (Allen Robinson), 10 yards, wiping out the playJudgment calls · 0 flags in 178 snaps before, position avg 1 per 331 +12% MIN MIN: Turnover
6 Q2 15:00 The Bears converted 3rd & 73rd & 4th downs · 33% expected +6% CHI CHI: Punt
7 Q2 4:05 The Bears converted 3rd & 93rd & 4th downs · 28% expected +5% CHI CHI: Field goal
8 Q2 1:12 The Bears converted 3rd & 93rd & 4th downs · 28% expected +5% CHI CHI: Field goal

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.

  • Taylor Gabriel (CHI WR), out · 0.6 pts
  • Kyle Long (CHI G), out · 0.5 pts
  • Akiem Hicks (CHI DT), out · 0.5 pts
  • Josh Kline (MIN G), 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

Vikings 10% · Bears 90%

Final margin
Bears by 10
Luck in points
2.3 for the Vikings
Luck-adjusted margin
Bears by 12.3
Replay with same day's form
Vikings 39% · Bears 61% 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 4 2019 games · Vikings · Bears

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