Primera Division · Friday, 17 April 2026. Final score 2–0 (half-time 2–0). Rebuilt from the season as it stood that morning, our rating would have been 55% 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 | 55% | 45% | Over |
| Over 3.5 goals | 30% | 70% | no pick |
| Both teams to score | 55% | 45% | Yes |
The result model puts Club Deportivo Los Chankas at 60%, the draw at 21% and Atletico Grau at 19%, from expected goals of 2.07 and 1.08.
The league sets the starting point. Primera Division has produced over 2.5 goals in 51% of its matches, and that is where a team with no record of its own would sit.
Each side's own record. Club Deportivo Los Chankas have 5 in 9 this season (3 of 4 at home), Atletico Grau 3 in 9 (2 of 5 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 52% and 46%.
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 48%.
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 52%.
Head to head. These sides have met 4 times in three years, producing over 2.5 goals in 50%. 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 52%.
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 61%, from expected goals of 2.07 for Club Deportivo Los Chankas and 1.08 for Atletico Grau. Folding in 30% of that view gives 54%.
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 55%.
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 |
|---|---|---|---|---|
| Club Deportivo Los Chankas | 9 | 56% | 44% | 78% |
| Atletico Grau | 9 | 33% | 22% | 33% |
More: Club Deportivo Los Chankas season stats · Atletico Grau season stats · Primera Division table and form. Ratings are calibrated probabilities, not tips — a 60% call is expected to miss two times in five.