luckadjusted

Week 5 2020 · October 11, 2020

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

Raiders at Chiefs, Week 5 2020: who deserved to win?

The Raiders beat the Chiefs 40–32, and it was no fluke: replayed with the way both teams actually played, the Raiders win 9 of 10.

An off day for the Chiefs: their defense played far below its usual level. In a fresh game against the Raiders they would win 73% of the time; with this day’s form, 13%. The numbers

Before kickoff the Chiefs were 79% favorites. The biggest swing (Q2, 2:50 left): the Raiders converted 3rd & 2, worth 22 points of win probability to the Raiders.

Final

Las Vegas Raiders 40
Kansas City Chiefs 32

October 11, 2020 · Arrowhead Stadium · Closing line: Chiefs −11

Luck index +13 Raiders about even · −13 Chiefs

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. Raiders win 9, Chiefs win 1.

  1. 1 LV 60 KC 26
  2. 2 LV 51 KC 24
  3. 3 LV 41 KC 20
  4. 4 LV 40 KC 24
  5. 5 LV 44 KC 31
  6. 6 LV 23 KC 13
  7. 7 LV 41 KC 34
  8. 8 LV 33 KC 28
  9. 9 LV 30 KC 28
  10. 10 LV 24 KC 30

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 Chiefs

Their defense played far below its usual level. In a fresh game against the Raiders they would win 73% of the time; with this day’s form, 13%.

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

UnitThis gameUsual levelBetter or worse than usual
Raiders offenseEPA per play gained +0.44 +0.16 better by 0.29
Raiders defenseEPA per play allowed +0.16 +0.17 better by 0.02
Chiefs offenseEPA per play gained +0.16 +0.22 worse by 0.06
Chiefs defenseEPA per play allowed +0.44 +0.10 worse by 0.34

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

Raiders win 87% of them, Chiefs 13%, counting the 2% still level after regulation as half each. The line is what actually happened: Raiders by 8.

Show as a table
Final margin in the replaysShare of replays
Raiders by 17+43.6%
Raiders by 9–1622.3%
Raiders by 1–820.6%
Level after regulation1.6%
Chiefs by 1–88.1%
Chiefs by 9–163.0%
Chiefs by 17+0.9%

Where the luck was

Take the luck out

The final margin was Raiders by 8. Remove the luck, one kind at a time, and it becomes Chiefs by 1.1.

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.

  • D. Carlson, 38 yds made · 86% expected
  • H. Butker, 32 yds made · 94% expected
  • D. Carlson, 43 yds made · 78% expected
  • Extra point missed · 93% expected
Bar: expected chance of a make. Filled dot: made. Open dot: missed or blocked.

When it happened

Chiefs’ chance of winning

As low as 0% and as high as 82%. 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 Chiefs were ahead in it, below while the Raiders were.
#WhenWhat happenedWin probability forNext drive
1 Q1 14:06 Offensive Holding on the Chiefs, 10 yards, wiping out the playJudgment calls +15% LV LV: Field goal
2 Q1 8:51 The Raiders converted 3rd & 103rd & 4th downs · 29% expected +16% LV LV: Field goal
3 Q1 3:02 The Chiefs converted 3rd & 73rd & 4th downs · 38% expected +12% KC KC: Touchdown
4 Q2 2:50 The Raiders converted 3rd & 23rd & 4th downs · 62% expected +22% LV LV: Touchdown
5 Q2 0:53 Offensive Pass Interference on the Chiefs (Travis Kelce), 10 yards, wiping out the playJudgment calls · 7 flags in 1392 snaps before, position avg 1 per 276 +14% LV LV: End of half
6 Q3 3:10 The Raiders converted 3rd & 43rd & 4th downs · 48% expected +12% LV LV: Touchdown
7 Q4 14:14 The Raiders missed an extra pointKicks · extra points are made about 94% of the timeFace Mask on the Raiders (Johnathan Hankins), 15 yardsJudgment calls · 8 flags in 919 snaps before, position avg 1 per 262 +11% KC LV: Field goal
8 Q4 10:33 The Raiders converted 3rd & 183rd & 4th downs · 20% expected +11% LV LV: 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.

  • L'Jarius Sneed (KC CB), out (IR) · 0.5 pts
  • Tyrell Williams (LV WR), out (IR) · 0.6 pts
  • Maliek Collins (LV DT), out · 0.4 pts
  • Richie Incognito (LV G), out (IR) · 0.4 pts
  • Bryan Edwards (LV 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

Raiders 41% · Chiefs 59%

Final margin
Raiders by 8
Luck in points
9.1 for the Raiders
Luck-adjusted margin
Chiefs by 1.1
Replay with same day's form
Raiders 87% · Chiefs 13% 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 5 2020 games · Raiders · Chiefs

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