The System · Week 5
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 |
|---|---|---|
| TB at DAL Thu 8:15 PM ET · locked | DAL 84% featured this week | Dallas Cowboys over the Buccaneers: Elo 78%, market 80%, System 84%. Tight agreement: go above both. Prescott is worth 17 Elo; Daniels is costing 100 Elo. |
| PHI at JAX Sun 9:30 AM ET · locked | JAX 73% featured this week | Jacksonville Jaguars over the Eagles: Elo 63%, market 77%, System 73%. Big disagreement: trust the market number. Hurts is worth 17 Elo. |
| NYG at WSH Sun 1:00 PM ET · locked | WSH 64% featured this week | Washington Commanders over the Giants: Elo 60%, market 63%, System 64%. Tight agreement: go above both. Winston is costing 71 Elo. |
| HOU at TEN Sun 1:00 PM ET · locked | HOU 71% featured this week | Houston Texans over the Titans: Elo 63%, market 74%, System 71%. Big disagreement: trust the market number. Ward is worth 19 Elo. |
| IND at PIT Sun 1:00 PM ET · locked | PIT 59% featured this week | Pittsburgh Steelers over the Colts: Elo 61%, market 59%, System 59%. Tight agreement: go above both. PIT off a bye; wind 19 mph (matters), 65°F. |
| CIN at MIA Sun 1:00 PM ET · locked | CIN 67% featured this week | Cincinnati Bengals over the Dolphins: Elo 50%, market 76%, System 67%. Big disagreement: trust the market number. Willis is worth 90 Elo; Burrow is worth 17 Elo; wind 11 mph, 90°F (heat hurts favorites). |
| LV at NE Sun 1:00 PM ET · locked | NE 64% featured this week | New England Patriots over the Raiders: Elo 63%, market 62%, System 64%. Tight agreement: go above both. Cousins is worth 70 Elo. |
| MIN at NO Sun 1:00 PM ET · locked | MIN 61% featured this week | Minnesota Vikings over the Saints: Elo 77%, market 56%, System 61%. Big disagreement: trust the market number. Shough is costing 16 Elo; Murray is worth 100 Elo. |
| CHI at GB Sun 1:00 PM ET · locked | CHI 50% featured this week | Chicago Bears over the Packers: Elo 45%, market 52%, System 50%. Nothing to exploit; the blend is fine. Bagent is costing 100 Elo. |
| CLE at NYJ Sun 1:00 PM ET · locked | NYJ 53% featured this week | New York Jets over the Browns: Elo 42%, market 56%, System 53%. Big disagreement: trust the market number. Smith is worth 22 Elo; Watson is worth 34 Elo; CLE off a bye. |
| DEN at LAC Sun 4:05 PM ET · locked | DEN 62% featured this week | Denver Broncos over the Chargers: Elo 59%, market 63%, System 62%. Nothing to exploit; the blend is fine. Herbert is worth 18 Elo. |
| DET at ARI Sun 4:25 PM ET · locked | DET 67% featured this week | Detroit Lions over the Cardinals: Elo 59%, market 69%, System 67%. Nothing to exploit; the blend is fine. Brissett is costing 40 Elo. |
| SF at SEA Sun 4:25 PM ET · locked | SEA 62% featured this week | Seattle Seahawks over the 49ers: Elo 59%, market 60%, System 62%. Tight agreement: go above both. Lock is costing 30 Elo. |
| BAL at ATL Sun 8:20 PM ET · locked | ATL 60% featured this week | Atlanta Falcons over the Ravens: Elo 56%, market 62%, System 60%. Nothing to exploit; the blend is fine. Penix is worth 28 Elo; Huntley is costing 16 Elo. |
| BUF at LAR Mon 8:15 PM ET · locked | LAR 59% featured this week | Los Angeles Rams over the Bills: Elo 53%, market 62%, System 59%. Nothing to exploit; the blend is fine. |
If The System's numbers are right, it expects about 38.1 points this week.