Promotion League · Saturday, 22 August 2026. Final score 2–1 (half-time 1–0). Rebuilt from the season as it stood that morning, our rating would have been 68% for over 2.5 goals. This match is older than our frozen ratings ledger, which keeps 30 days, so that figure is a reconstruction from pre-match data rather than a number we published at the time — a distinction worth making, because only the frozen ones prove what we actually said beforehand.
Open this match in the app →| Market | Yes | No | Our call |
|---|---|---|---|
| Over 2.5 goals | 68% | 32% | Over |
| Over 3.5 goals | 50% | 50% | Over |
| Both teams to score | 67% | 33% | Yes |
The result model puts Cham at 43%, the draw at 23% and Grand-Saconnex at 34%, from expected goals of 1.85 and 1.64.
The league sets the starting point. Promotion League has produced over 2.5 goals in 69% of its matches, and that is where a team with no record of its own would sit.
Each side's own record. Cham have 2 in 3 this season (1 of 2 at home), Grand-Saconnex 3 in 3 (1 of 1 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 69% and 73%.
Last season still counts, briefly. With 3 and 3 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 70% and 72%.
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 70%.
Head to head. These sides have met 4 times in three years, producing over 2.5 goals in 25%. 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 68%.
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 68%, from expected goals of 1.85 for Cham and 1.64 for Grand-Saconnex. Folding in 30% of that view gives 68%.
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 |
|---|---|---|---|---|
| Cham | 3 | 67% | 0% | 67% |
| Grand-Saconnex | 3 | 100% | 67% | 67% |
More: Cham season stats · Grand-Saconnex season stats · Promotion League table and form. Ratings are calibrated probabilities, not tips — a 60% call is expected to miss two times in five.