Primera Division · Saturday, 15 August 2026. Final score 0–3 (half-time 0–2). Rebuilt from the season as it stood that morning, our rating would have been 52% 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 | 52% | 48% | Over |
| Over 3.5 goals | 29% | 71% | no pick |
| Both teams to score | 56% | 44% | Yes |
The result model puts Club Deportivo Los Chankas at 41%, the draw at 27% and FBC Melgar at 32%, from expected goals of 1.4 and 1.22.
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 10 in 21 this season (5 of 11 at home), FBC Melgar 13 in 21 (5 of 10 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 49% and 56%.
Last season still counts, briefly. With 21 and 21 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 53% and 52%.
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 5 times in three years, producing over 2.5 goals in 60%. 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 53%.
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 49%, from expected goals of 1.4 for Club Deportivo Los Chankas and 1.22 for FBC Melgar. Folding in 30% of that view gives 51%.
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 52%.
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 | 21 | 48% | 38% | 57% |
| FBC Melgar | 21 | 62% | 43% | 71% |
More: Club Deportivo Los Chankas season stats · FBC Melgar season stats · Primera Division table and form. Ratings are calibrated probabilities, not tips — a 60% call is expected to miss two times in five.