Primera Nacional · Sunday, 18 October 2026 · 21:00. Final score 1–2 (half-time 1–1). Before kick-off we rated it 68% 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 | 32% | 68% | Under |
| Over 3.5 goals | 12% | 88% | no pick |
| Both teams to score | 40% | 60% | No |
The result model puts Chaco For Ever at 56%, the draw at 29% and Central Norte at 15%, from expected goals of 1.35 and 0.55.
| Market | Price | Implied | Our rating | Edge |
|---|---|---|---|---|
| Over 2.5 goals | 3.10 | 30% | 32% | +1% |
| Under 2.5 goals | 1.36 | 70% | 68% | -1% |
| Both teams to score | 2.50 | 38% | 40% | +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: Chaco For Ever 2.05, draw 2.80, Central Norte 4.33.
The league sets the starting point. Primera Nacional has produced over 2.5 goals in 31% of its matches, and that is where a team with no record of its own would sit.
Each side's own record. Chaco For Ever have 11 in 33 this season (6 of 16 at home), Central Norte 7 in 33 (5 of 16 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 32% and 25%.
Last season still counts, briefly. With 33 and 33 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 32% and 26%.
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 29%.
Head to head. These sides have met 3 times in three years, producing over 2.5 goals in 0%. 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 28%.
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 30%, from expected goals of 1.35 for Chaco For Ever and 0.55 for Central Norte. Folding in 30% of that view gives 28%.
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 32%.
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 |
|---|---|---|---|---|
| Chaco For Ever | 33 | 33% | 12% | 42% |
| Central Norte | 33 | 21% | 9% | 39% |
More: Chaco For Ever season stats · Central Norte season stats · Primera Nacional table and form. Ratings are calibrated probabilities, not tips — a 60% call is expected to miss two times in five.