Primera Nacional · Sunday, 20 September 2026. Final score 3–0 (half-time 3–0). 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 | 10% | 90% | no pick |
| Both teams to score | 37% | 63% | No |
The result model puts Colon Santa Fe at 45%, the draw at 36% and Los Andes at 19%, from expected goals of 1 and 0.55.
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. Colon Santa Fe have 10 in 29 this season (6 of 14 at home), Los Andes 5 in 29 (3 of 14 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 23%.
Last season still counts, briefly. With 29 and 29 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 31% and 24%.
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 20%, from expected goals of 1 for Colon Santa Fe and 0.55 for Los Andes. 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 |
|---|---|---|---|---|
| Colon Santa Fe | 29 | 34% | 10% | 41% |
| Los Andes | 29 | 17% | 3% | 24% |
More: Colon Santa Fe season stats · Los Andes season stats · Primera Nacional table and form. Ratings are calibrated probabilities, not tips — a 60% call is expected to miss two times in five.