Challenge League · Friday, 9 October 2026. Final score 2–1 (half-time 0–0). Before kick-off we rated it 64% over 2.5 goals — the match finished with 3, so that call landed. That rating was frozen into a version-controlled ledger before the game and has not been touched since.
Open this match in the app →| Market | Yes | No | Our call |
|---|---|---|---|
| Over 2.5 goals | 63% | 37% | Over |
| Over 3.5 goals | 39% | 61% | no pick |
| Both teams to score | 61% | 39% | Yes |
The result model puts Stade Nyonnais at 28%, the draw at 22% and FC Aarau at 49%, from expected goals of 1.46 and 1.98.
The league sets the starting point. Challenge League has produced over 2.5 goals in 62% of its matches, and that is where a team with no record of its own would sit.
Each side's own record. Stade Nyonnais have 7 in 9 this season (3 of 4 at home), FC Aarau 8 in 9 (4 of 4 away). Those records are pulled toward the league rate with the weight of about 24 matches — enough that two or three unusual games cannot swing a rating — giving 66% and 69%.
Last season still counts, briefly. With 9 and 9 games played this season, last season's rates are still blended in and fade out entirely by game 40 — the point at which our testing showed they stop adding accuracy. A single season is part luck, so each club's record is first pulled toward the league average by 34 games' weight. That moves the two figures to 56% and 66%.
The mix. Weighted 40% home side, 40% away side and 20% league — the split that beat every alternative across 30,582 matches of testing — that gives 61%.
Head to head. These sides have met 12 times in three years, producing over 2.5 goals in 67%. That nudges the number 5% of the way toward the head-to-head pattern — deliberately small, because fixtures change more than reputations do — landing on 61%.
Goal expectation. Separately a Poisson model built from attack and defence strength — using real expected-goals data where the league has it — puts this match at 67%, from expected goals of 1.46 for Stade Nyonnais and 1.98 for FC Aarau. Folding in 30% of that view gives 63%.
This breakdown is generated from the same inputs the rating uses, so it cannot describe a calculation we did not perform. The full model is set out in the methodology.
| Team | Games | O2.5 | O3.5 | BTTS |
|---|---|---|---|---|
| Stade Nyonnais | 9 | 78% | 44% | 56% |
| FC Aarau | 9 | 89% | 33% | 89% |
More: Stade Nyonnais season stats · FC Aarau season stats · Challenge League table and form. Ratings are calibrated probabilities, not tips — a 60% call is expected to miss two times in five.