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NFL · Fixtures & Results

Chicago Bears at Seattle Seahawks

NFL 2026 · Week 8 · · Lumen Field

Chicago Bears at Seattle Seahawks, Week 8 of the 2026 season: Chicago Bears won 34–17.

Prediction made · Elo model

Result

Chicago Bears 34–17 Seattle Seahawks

Closing line SEA −3, total 46.5 (went over). Chicago Bears covered.

What the model predicted beforehand

The model gave Seattle Seahawks a 65.3% chance of winning and Chicago Bears 34.7%, with a predicted margin of SEA by 4.4. The betting market had it SEA 62%. The underdog won.

OutcomeThis modelBetting market
Seattle Seahawks win65.3%61.6%
Chicago Bears win34.7%38.4%
MarginSEA by 4.4SEA −3
Total points–46.5

The model is a margin-based Elo rating walked forward over every game since 2002, with home advantage; ties are rare enough not to be priced. Betting market: the moneyline with the bookmaker’s margin removed, and the spread as quoted (favourite first).

How it might finish: winning margin
Chance of each winning margin
Chicago Bears by 15+7%
Chicago Bears by 8–149%
Chicago Bears by 4–711%
Chicago Bears by 1–311%
Tie<1%
Seattle Seahawks by 1–313%
Seattle Seahawks by 4–714%
Seattle Seahawks by 8–1415%
Seattle Seahawks by 15+20%

Most likely exact margins: SEA by 3 (8.5%), CHI by 3 (7.3%) and SEA by 7 (5.6%). NFL scores come in 3s and 7s, so margins of 3, 7, 10 and 14 come up far more often than their neighbours.

On this curve Seattle Seahawks were 49.4% to cover the line (SEA −3): to win by more than 3.

The curve is a normal spread of results around the model’s expected margin (Stern, 1991), reweighted for the NFL’s key numbers. Its shape was fitted on 2002–2023 and checked on 2024, where it beat a plain bell curve. Because it is built from the expected margin alone, its win chances can differ by a few points from the Elo figure above, which is the one the Model Lab scores.