luckadjusted
CFB Week 4 · 2026

Week 2 2026 · September 12, 2026

South Florida at Army, Week 2 2026: who deserved to win?

South Florida beat Army 28–24, but the replays lean toward Army: it takes 6 of 10 with the same day's form.

Before kickoff Army was a 58% favorite. The biggest swing (Q4, 0:19 left): South Florida converted 4th & 6, worth 14 points of win probability to South Florida.

Final

South Florida Bulls 28
Army Black Knights 24

September 12, 2026 · Michie Stadium · Closing line: Army −3

Luck index +62 South Florida very lucky · −62 Army

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. South Florida wins 4, Army wins 6.

  1. 1 USF 45 ARMY 22
  2. 2 USF 27 ARMY 14
  3. 3 USF 31 ARMY 24
  4. 4 USF 31 ARMY 28
  5. 5 USF 38 ARMY 41
  6. 6 USF 20 ARMY 24
  7. 7 USF 14 ARMY 21
  8. 8 USF 20 ARMY 31
  9. 9 USF 21 ARMY 37
  10. 10 USF 17 ARMY 42

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, conversion and judgment call redrawn; everything else fixed. The narrowest view of luck.

How 4,000 replays ended

South Florida wins 38% of them, Army 62%, counting the 5% still level after regulation as half each. The line is what actually happened: South Florida by 4.

Show as a table
Final margin in the replaysShare of replays
South Florida by 17+7.4%
South Florida by 9–169.7%
South Florida by 1–816.8%
Level after regulation4.7%
Army by 1–823.8%
Army by 9–1617.8%
Army by 17+19.9%

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 +2.6 points to South Florida: the final margin was South Florida by 4, without the luck South Florida by 1.4. Luck shares are the fitted ones (how much of each kind is luck).

Penalties: South Florida 3 for 15 yards, Army 4 for 45 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
Q2 10:10 Unnecessary Roughness on Army, 7 yards +1% USF +0.4 pts
Q2 2:05 Offside on South Florida, 5 yards · pre-snap 0% ARMY +0.3 pts
Q3 15:00 Disconcerting Signals on South Florida, 5 yards · pre-snap +4% ARMY +1.7 pts
Q3 9:04 Pass Interference on Army, 8 yards +12% ARMY +0.6 pts
Q3 8:18 Unnecessary Roughness on Army, 15 yards +5% USF +1.6 pts
Q4 3:10 Illegal Substitution on South Florida, 5 yards · pre-snap +2% ARMY +0.3 pts
Q4 1:46 Unnecessary Roughness on Army, 15 yards +1% USF +1.6 pts

When it happened

Army’s chance of winning

As low as 0% and as high as 100%. Numbers mark the biggest luck moments, listed below.

Our in-game win probability: the score, the value of the possession and the time left, starting from the betting line. Overtime has no clock and is drawn at a fixed width. Shaded above the middle while Army was ahead in it, below while South Florida was.
#WhenWhat happenedWin probability forNext drive
1 Q3 11:26 South Florida converted 3rd & 53rd & 4th downs · 47% expected +4% USF USF: Touchdown
2 Q3 9:04 Pass Interference on Army, 8 yardsJudgment calls +12% ARMY USF: Touchdown
3 Q3 8:18 Unnecessary Roughness on Army, 15 yardsJudgment calls +5% USF USF: Punt
4 Q3 6:30 Army was stopped on 3rd & 43rd & 4th downs · 51% expected +5% USF ARMY: Punt
5 Q3 0:42 Army converted 3rd & 53rd & 4th downs · 46% expected +5% ARMY ARMY: Field goal
6 Q4 14:08 Army was stopped on 3rd & 53rd & 4th downs · 38% expected +5% USF ARMY: Field goal
7 Q4 11:44 South Florida was stopped on 3rd & 33rd & 4th downs · 59% expected +8% ARMY USF: Punt
8 Q4 0:19 South Florida converted 4th & 63rd & 4th downs · 42% expected +14% USF USF: End of game

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

South Florida 61% · Army 39%

Final margin
South Florida by 4
Luck in points
2.6 for South Florida
Luck-adjusted margin
South Florida by 1.4
Replay with same day's form
South Florida 38% · Army 62% 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 expected points from CollegeFootballData.com via cfbfastR; win probability from our own model of the score, the possession and the betting line; kicks valued against each kicker’s own record. College play-by-play has no charting of drops or interception-worthy throws and no injury reports, so those kinds of luck aren’t counted here.

Methodology and validation · All Week 2 2026 games · South Florida · Army

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