Primera Nacional · Tuesday, 21 April 2026. Final score 1–0 (half-time 0–0). Rebuilt from the season as it stood that morning, our rating would have been 32% 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 | 32% | 68% | Under |
| Over 3.5 goals | 11% | 89% | no pick |
| Both teams to score | 40% | 60% | No |
The result model puts Atlanta at 37%, the draw at 33% and Chacarita Juniors at 30%, from expected goals of 0.98 and 0.86.
The league sets the starting point. Primera Nacional has produced over 2.5 goals in 28% of its matches, and that is where a team with no record of its own would sit.
Each side's own record. Atlanta have 4 in 8 this season (2 of 5 at home), Chacarita Juniors 3 in 8 (1 of 3 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 33% and 30%.
Last season still counts, briefly. With 8 and 8 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 28% and 29%.
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 28%, from expected goals of 0.98 for Atlanta and 0.86 for Chacarita Juniors. 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 |
|---|---|---|---|---|
| Atlanta | 8 | 50% | 13% | 50% |
| Chacarita Juniors | 8 | 38% | 13% | 50% |
More: Atlanta 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.