luckadjusted

Week 4 2020 · October 4, 2020

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

Browns at Cowboys, Week 4 2020: who deserved to win?

The Browns beat the Cowboys 49–38, but it was a coin flip: replayed with the way both teams played, the Browns win 4 of 10. Luck ran their way: fumble bounces alone were worth 8 points of win probability to the Browns.

Before kickoff the Cowboys were 60% favorites. The biggest swing (Q1, 2:13 left): the Cowboys converted 4th & 2, worth 11 points of win probability to the Cowboys.

Final

Cleveland Browns 49
Dallas Cowboys 38

October 4, 2020 · AT&T Stadium · Closing line: Cowboys −3.5

Luck index +60 Browns lucky · −60 Cowboys

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. Browns win 4, Cowboys win 6.

  1. 1 CLE 51 DAL 28
  2. 2 CLE 20 DAL 7
  3. 3 CLE 31 DAL 24
  4. 4 CLE 34 DAL 31
  5. 5 CLE 48 DAL 50
  6. 6 CLE 34 DAL 40
  7. 7 CLE 31 DAL 41
  8. 8 CLE 39 DAL 55
  9. 9 CLE 19 DAL 39
  10. 10 CLE 18 DAL 48

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

Browns win 40% of them, Cowboys 60%, counting the 2% still level after regulation as half each. The line is what actually happened: Browns by 11.

Show as a table
Final margin in the replaysShare of replays
Browns by 17+9.5%
Browns by 9–1612.4%
Browns by 1–818.1%
Level after regulation2.4%
Cowboys by 1–822.1%
Cowboys by 9–1616.3%
Cowboys by 17+19.2%

Where the luck was

What the luck was worth

Every lucky and unlucky play, weighted by the moment it happened: its swing in win probability, added up by kind. A missed kick in a decided game counts for nothing; the same kick at the end of a tie game can be most of a win.

Swings add up across a game, so in one that went back and forth they can pass 100%. On the scoreboard the same luck was worth +8.7 points to the Browns: the final margin was Browns by 11, without the luck Browns by 2.3. Luck shares are the fitted ones (how much of each kind is luck).

The kicks

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

  • C. Parkey, 37 yds made · 92% expected
  • C. Parkey, 44 yds made · 84% expected
Bar: expected chance of a make. Filled dot: made. Open dot: missed or blocked.

Penalties: Browns 5 for 40 yards, Cowboys 6 for 65 yards

Every accepted flag, in order, and what it did to the helped team’s chance of winning at that moment, including any play it wiped out (points on the scoreboard in grey). A flag in a decided game is worth nothing; one at the turn of a close game can be worth most of a win. Judgment calls count toward luck, pre-snap fouls mostly don’t. How calls are valued

WhenFlagWin probability for
Q1 1:27 Offensive Holding on the Browns (Donovan Peoples-Jones), 10 yards +3% DAL +0.9 pts
Q1 1:08 Offensive Holding on the Browns, 10 yards +2% DAL +1.0 pts
Q1 0:59 Face Mask on the Cowboys (Jaylon Smith), 15 yards +3% CLE +1.4 pts
Q2 4:26 False Start on the Cowboys, 5 yards · pre-snap +1% CLE +0.9 pts
Q3 13:29 Illegal Block Above the Waist on the Browns (Odell Beckham Jr.), 10 yards 0% CLE +0.5 pts
Q3 12:30 Face Mask on the Cowboys (Trevon Diggs), 15 yards +1% CLE +1.8 pts
Q3 4:02 Unnecessary Roughness on the Cowboys, 15 yards 0% CLE +1.8 pts
Q4 8:34 Illegal Block Above the Waist on the Cowboys, 10 yards 0% CLE +0.9 pts
Q4 8:34 Delay of Game on the Browns, 5 yards · pre-snap 0% DAL +0.4 pts
Q4 7:52 Neutral Zone Infraction on the Browns (Olivier Vernon), 5 yards · pre-snap 0% DAL +0.6 pts
Q4 3:25 Defensive Offside on the Cowboys, 5 yards · pre-snap 0% CLE +0.5 pts

Browns penalties, every game · Cowboys penalties, every game · All teams, 2020

When it happened

Cowboys’ chance of winning

As low as 0% and as high as 70%. 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 Cowboys were ahead in it, below while the Browns were.
#WhenWhat happenedWin probability forNext drive
1 Q1 7:43 The Browns converted 3rd & 13rd & 4th downs · 76% expected +5% CLE CLE: Punt
2 Q1 6:25 The Browns were stopped on 3rd & 73rd & 4th downs · 37% expected +3% DAL CLE: Punt
3 Q1 2:13 The Cowboys converted 4th & 23rd & 4th downs · 61% expected +11% DAL DAL: Touchdown
4 Q2 13:38 The Browns converted 3rd & 63rd & 4th downs · 40% expected +5% CLE CLE: Touchdown
5 Q2 11:23 The Cowboys fumbled and the Browns recoveredFumble bounces · loose balls are close to 50/50 +8% CLE DAL: Turnover
6 Q2 9:22 The Cowboys fumbled and the Browns recoveredFumble bounces · loose balls are close to 50/50 +3% CLE DAL: Punt
7 Q2 1:11 The Browns converted 3rd & 83rd & 4th downs · 35% expected +4% CLE CLE: Field goal
8 Q4 3:42 The Cowboys’ two-point try was good3rd & 4th downs · 47% expected +5% DAL DAL: Turnover

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.

  • La'el Collins (DAL T), out (IR) · 0.6 pts
  • Chidobe Awuzie (DAL CB), out (IR) · 0.6 pts
  • Sean Lee (DAL LB), out (IR) · 0.4 pts
  • Greedy Williams (CLE CB), out · 0.4 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

Browns 75% · Cowboys 25%

Final margin
Browns by 11
Luck in points
8.7 for the Browns
Luck-adjusted margin
Browns by 2.3
Replay with same day's form
Browns 40% · Cowboys 60% 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 2020 games · Browns · Cowboys

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