Primera Nacional · Saturday, 26 September 2026. Final score 2–1 (half-time 0–0). Before kick-off we rated it 74% 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 | 30% | 70% | Under |
| Over 3.5 goals | 11% | 89% | no pick |
| Both teams to score | 40% | 60% | No |
The result model puts Ciudad de Bolívar at 33%, the draw at 36% and Chaco For Ever at 32%, from expected goals of 0.82 and 0.81.
The league sets the starting point. Primera Nacional has produced over 2.5 goals in 30% of its matches, and that is where a team with no record of its own would sit.
Each side's own record. Ciudad de Bolívar have 7 in 30 this season (4 of 15 at home), Chaco For Ever 8 in 30 (3 of 15 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 26% and 28%.
Last season still counts, briefly. With 30 and 30 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 26% and 28%.
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 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 23%, from expected goals of 0.82 for Ciudad de Bolívar and 0.81 for Chaco For Ever. Folding in 30% of that view gives 26%.
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 30%.
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 |
|---|---|---|---|---|
| Ciudad de Bolívar | 30 | 23% | 13% | 40% |
| Chaco For Ever | 30 | 27% | 10% | 37% |
More: Ciudad de Bolívar season stats · Chaco For Ever season stats · Primera Nacional table and form. Ratings are calibrated probabilities, not tips — a 60% call is expected to miss two times in five.