The System · Week 1
Ten rules, each with the number that earned it. Tested on 27 seasons, 1999–2025, 6,918 decided games: the 24 FiveThirtyEight published and every season Delta Sunday has replayed itself, refreshed as each week finishes. Per season over the 27: The System 1,011 points, the blend 1,003, the market alone 997, Elo 892. Against Elo that is 119 a season with a standard error of 19, ahead in 24 of 27 seasons: a real gap. Against the market it is 14 a season with a standard error of 10, ahead in 16 of 27: even, within the noise. And the rules were chosen on these same seasons, so treat the edge over the market as flattering; the seasons the site replayed itself went −16, +90 and +32.
- Start from the market. Over 27 seasons (1999–2025) the closing line scored 997 points a season; Elo scored 892.
- Add Elo at a quarter weight. A hair better than the market alone and it explains itself: quarterback changes, rest, the reasoning on every card. Half weight costs 17 a season.
- Nudge tight agreement by 2. Same favorite of 55% or more, within 4 points. Favorites there won 69.8% against a 67.6% forecast over 2,607 games. Small, but consistent across eras.
- Don't chase Elo's disagreements. Ten or more points apart, Elo's side won 50% while Elo claimed 65% and the market 48%, over 1,102 games. The quarter weight already handles it.
- Don't cap your confidence. Every cap tested cost points, in the long run and in the recent replays.
- Play coin flips at the number, not 50. Forcing 50 cost points.
- Playoffs: same blend. Elo and the market are level in January over 248 games. A heavier Elo weighting looked good on 39 recent games and did not hold.
- The lock gets the same 2-point nudge, no more. Locks won 85% (434-76) against a 79% forecast over 27 seasons. Pressing them by 5 cost points over 510 locks.
- Never skip a game. A skip is a 50/50 pick worth zero. Every System number expects positive points.
- Mind the weather, outdoors. Wind of 15 mph or more: favorites won 62% against a 65% forecast, so shrink toward 50 by a fifth. Fifty degrees or colder: favorites won 69% against 66%, so add 2. Over 75: shrink by a tenth. Together about 9 points a season over 24, positive in every era. Domes get nothing.
Every rule we tried beyond these cost points. The discipline is to play the numbers, and move one only when you know something the models don't: a late scratch, weather, a benching. The System is scored on every leaderboard next to the plain blend, so you can see whether the last two rules earn their keep this season.
| Game | The System | Why |
|---|---|---|
| NE at SEA Wed 8:20 PM ET · locked | SEA 61% featured this week | Seattle Seahawks over the Patriots: Elo 59%, market 59%, System 61%. Tight agreement: go above both. Lock is costing 34 Elo. |
| SF at LAR Thu 8:35 PM ET · locked | LAR 59% featured this week | Los Angeles Rams over the 49ers: Elo 54%, market 60%, System 59%. Nothing to exploit; the blend is fine. |
| NO at DET Sun 1:00 PM ET · locked | DET 71% featured this week | Detroit Lions over the Saints: Elo 67%, market 70%, System 71%. Tight agreement: go above both. Shough is costing 18 Elo. |
| NYJ at TEN Sun 1:00 PM ET · locked | TEN 54% featured this week | Tennessee Titans over the Jets: Elo 53%, market 54%, System 54%. Coin flip: stay near 50. Ward is worth 21 Elo; Smith is worth 24 Elo. |
| BAL at IND Sun 1:00 PM ET · locked | BAL 57% featured this week | Baltimore Ravens over the Colts: Elo 50%, market 59%, System 57%. Nothing to exploit; the blend is fine. |
| ATL at PIT Sun 1:00 PM ET · locked | PIT 70% featured this week | Pittsburgh Steelers over the Falcons: Elo 65%, market 69%, System 70%. Tight agreement: go above both. Rush is costing 29 Elo. |
| CHI at CAR Sun 1:00 PM ET · locked | CHI 57% featured this week | Chicago Bears over the Panthers: Elo 52%, market 59%, System 57%. Nothing to exploit; the blend is fine. |
| BUF at HOU Sun 1:00 PM ET · locked | BUF 51% featured this week | Buffalo Bills over the Texans: Elo 41%, market 54%, System 51%. Big disagreement: trust the market number. |
| CLE at JAX Sun 1:00 PM ET · locked | JAX 72% featured this week | Jacksonville Jaguars over the Browns: Elo 67%, market 74%, System 72%. Clear favorite, take the average. Watson is worth 38 Elo. |
| TB at CIN Sun 1:00 PM ET · locked | CIN 62% featured this week | Cincinnati Bengals over the Buccaneers: Elo 61%, market 60%, System 62%. Tight agreement: go above both. Burrow is worth 18 Elo. |
| MIA at LV Sun 4:25 PM ET · locked | LV 55% featured this week | Las Vegas Raiders over the Dolphins: Elo 42%, market 59%, System 55%. Big disagreement: trust the market number. Cousins is worth 78 Elo; Willis is worth 100 Elo. |
| GB at MIN Sun 4:25 PM ET · locked | MIN 57% featured this week | Minnesota Vikings over the Packers: Elo 66%, market 54%, System 57%. Big disagreement: trust the market number. Wentz is worth 47 Elo. |
| ARI at LAC Sun 4:25 PM ET · locked | LAC 76% featured this week | Los Angeles Chargers over the Cardinals: Elo 75%, market 74%, System 76%. Tight agreement: go above both. Herbert is worth 20 Elo; Brissett is costing 44 Elo. |
| WSH at PHI Sun 4:25 PM ET · locked | PHI 69% featured this week | Philadelphia Eagles over the Commanders: Elo 65%, market 67%, System 69%. Tight agreement: go above both. Hurts is worth 19 Elo; Daniels is worth 17 Elo. |
| DAL at NYG Sun 8:20 PM ET · locked | DAL 56% featured this week | Dallas Cowboys over the Giants: Elo 49%, market 59%, System 56%. Nothing to exploit; the blend is fine. Prescott is worth 19 Elo. |
| DEN at KC Mon 8:15 PM ET · locked | KC 56% featured this week | Kansas City Chiefs over the Broncos: Elo 52%, market 57%, System 56%. Nothing to exploit; the blend is fine. Mahomes is worth 51 Elo. |
If The System's numbers are right, it expects about 29.4 points this week.