luckadjusted
NFL Week 9 · 2026

Divisional round 2023 · January 21, 2024

Buccaneers at Lions, Divisional round 2023: who deserved to win?

The Lions beat the Buccaneers 31–23, and the replays lean their way: with the same day's form, they win 7 of 10.

Before kickoff the Lions were 67% favorites. The biggest swing (Q3, 10:18 left): Chop Block on the Lions (David Montgomery), 7 yards, wiping out the play, worth 13 points of win probability to the Buccaneers.

Final

Tampa Bay Buccaneers 23
Detroit Lions 31

January 21, 2024 · Ford Field · Closing line: Lions −6

Luck index +27 Lions lucky · −27 Buccaneers

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. Buccaneers win 3, Lions win 7.

  1. 1 TB 35 DET 20
  2. 2 TB 41 DET 34
  3. 3 TB 24 DET 22
  4. 4 TB 29 DET 31
  5. 5 TB 34 DET 38
  6. 6 TB 29 DET 37
  7. 7 TB 7 DET 17
  8. 8 TB 6 DET 20
  9. 9 TB 6 DET 26
  10. 10 TB 17 DET 47

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

Buccaneers win 27% of them, Lions 73%, counting the 4% still level after regulation as half each. The line is what actually happened: Lions by 8.

Show as a table
Final margin in the replaysShare of replays
Buccaneers by 17+4.3%
Buccaneers by 9–168.0%
Buccaneers by 1–814.5%
Level after regulation3.5%
Lions by 1–824.6%
Lions by 9–1619.2%
Lions by 17+25.9%

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 +2.1 points to the Lions: the final margin was Lions by 8, without the luck Lions by 6. 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.

  • M. Badgley, 23 yds made · 97% expected
  • C. McLaughlin, 43 yds made · 86% expected
  • C. McLaughlin, 50 yds missed · 74% expected
Bar: expected chance of a make. Filled dot: made. Open dot: missed or blocked.

Penalties: Buccaneers 5 for 33 yards, Lions 3 for 17 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 half toward luck; pre-snap fouls, which repeat, don’t count. How calls are valued

WhenFlagWin probability for
Q1 10:34 Defensive Holding on the Buccaneers (Calijah Kancey), 5 yards +2% DET +0.9 pts
Q1 10:12 Face Mask on the Buccaneers (Zyon McCollum), 8 yards +3% DET +1.1 pts
Q2 11:19 Offensive Pass Interference on the Buccaneers (Cade Otton), 10 yards +4% DET +1.6 pts
Q3 10:18 Chop Block on the Lions (David Montgomery), 7 yards, wiping out the play +13% TB +3.4 pts
Q3 8:22 Illegal Formation on the Buccaneers (SirVocea Dennis), 5 yards · pre-snap +1% DET +0.4 pts
Q3 3:48 Defensive Offside on the Lions (Brian Branch), 5 yards, wiping out the play · pre-snap +3% TB +0.7 pts
Q3 3:29 Defensive Holding on the Lions (Ifeatu Melifonwu), 5 yards 0% TB +0.1 pts
Q4 3:09 Illegal Use of Hands on the Buccaneers (Carlton Davis), 5 yards +1% DET +0.5 pts

Buccaneers penalties, every game · Lions penalties, every game · All teams, 2023

When it happened

Lions’ chance of winning

As low as 46% and as high as 100%. 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 Lions were ahead in it, below while the Buccaneers were.
#WhenWhat happenedWin probability forNext drive
1 Q1 9:08 The Lions were stopped on 3rd & 33rd & 4th downs · 47% expected +5% TB DET: Field goal
2 Q2 15:00 The Lions converted 3rd & 43rd & 4th downs · 49% expected +7% DET DET: Touchdown
3 Q2 4:43 The Buccaneers converted 3rd & 73rd & 4th downs · 37% expected +6% TB TB: Missed field goal
4 Q2 2:29 C. McLaughlin missed a 50-yard field goalKicks · 74% expected for him, 39 of 53 from 45+ before +9% DET TB: Touchdown
5 Q3 11:31 The Buccaneers were stopped on 3rd & 43rd & 4th downs · 49% expected +7% DET TB: Punt
6 Q3 10:18 Chop Block on the Lions (David Montgomery), 7 yards, wiping out the playJudgment calls · 2 flags in 3167 snaps before, position avg 1 per 870 +13% TB TB: Punt
7 Q3 3:51 The Lions converted 4th & 13rd & 4th downs · 70% expected +11% DET DET: Touchdown
8 Q3 0:16 The Buccaneers converted 3rd & 103rd & 4th downs · 30% expected +12% TB TB: Touchdown

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

Buccaneers 10% · Lions 90%

Final margin
Lions by 8
Luck in points
2.0 for the Lions
Luck-adjusted margin
Lions by 6.0
Replay with same day's form
Buccaneers 27% · Lions 73% unchanged: why
How much of each is luck?

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

What counts

None by default: our tests measured no carryover after a lucky break. Slide it up to count a break for more than its own swing. 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; injuries from snap counts and injury reports.

Methodology and validation · All Divisional round 2023 games · Buccaneers · Lions

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