Primera Nacional · Saturday, 10 October 2026. Final score 2–1 (half-time 1–1). Before kick-off we rated it 70% 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 | 31% | 69% | Under |
| Over 3.5 goals | 11% | 89% | no pick |
| Both teams to score | 39% | 61% | No |
The result model puts Almagro at 33%, the draw at 36% and Chacarita Juniors at 31%, from expected goals of 0.84 and 0.79.
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. Almagro have 10 in 32 this season (4 of 16 at home), Chacarita Juniors 8 in 32 (3 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 31% and 27%.
Last season still counts, briefly. With 32 and 32 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 30% 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 29%.
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 0.84 for Almagro and 0.79 for Chacarita Juniors. Folding in 30% of that view gives 27%.
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 31%.
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 |
|---|---|---|---|---|
| Almagro | 32 | 31% | 13% | 41% |
| Chacarita Juniors | 32 | 25% | 6% | 28% |
More: Almagro season stats · Chacarita Juniors season stats · Primera Nacional table and form. Ratings are calibrated probabilities, not tips — a 60% call is expected to miss two times in five.