Serie B · Sunday, 18 October 2026 · 18:30. Final score 1–2 (half-time 1–1). Before kick-off we rated it 52% under 2.5 goals — the match finished with 3, so that call missed. 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 | 48% | 52% | Under |
| Over 3.5 goals | 25% | 75% | no pick |
| Both teams to score | 53% | 47% | Yes |
The result model puts Sampdoria at 49%, the draw at 26% and Arezzo at 24%, from expected goals of 1.54 and 1.
| Market | Price | Implied | Our rating | Edge |
|---|---|---|---|---|
| Over 2.5 goals | 2.00 | 47% | 48% | +1% |
| Under 2.5 goals | 1.80 | 53% | 52% | -1% |
| Both teams to score | 1.91 | 50% | 53% | +3% |
Implied percentages have the bookmaker's margin removed, so they add to 100 and can be compared with our rating directly. Edge is simply the gap between the two. A positive edge means our model thinks the outcome is likelier than the price suggests — it is not a tip, and a high probability with a negative edge is a poor bet however safe it looks. Prices are a pre-match snapshot from a single bookmaker and move constantly.
Match odds: Sampdoria 1.75, draw 3.40, Arezzo 4.50.
The league sets the starting point. Serie B has produced over 2.5 goals in 49% of its matches, and that is where a team with no record of its own would sit.
Each side's own record. Sampdoria have 4 in 6 this season (2 of 2 at home), Arezzo 4 in 6 (2 of 3 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 53% and 53%.
Last season still counts, briefly. With 6 and 6 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 45% and 47%.
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 47%.
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 47%, from expected goals of 1.54 for Sampdoria and 1 for Arezzo. Folding in 30% of that view gives 47%.
Calibration. Tested against 97,729 past matches, our ratings below 55% have run consistently too pessimistic — a figure in the high 30s, for instance, has come in about four points higher. So ratings in that range are lifted part-way back, giving 48%.
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.
More: Sampdoria season stats · Arezzo season stats · Serie B table and form. Ratings are calibrated probabilities, not tips — a 60% call is expected to miss two times in five.