Primera Nacional · Saturday, 26 September 2026. Final score 2–0 (half-time 1–0). Before kick-off we rated it 67% under 2.5 goals — the match finished with 2, so that call landed. 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 | 36% | 64% | Under |
| Over 3.5 goals | 14% | 86% | no pick |
| Both teams to score | 40% | 60% | No |
The result model puts Quilmes at 62%, the draw at 26% and Club Atlético Güemes at 12%, from expected goals of 1.55 and 0.53.
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. Quilmes have 10 in 30 this season (4 of 15 at home), Club Atlético Güemes 13 in 30 (7 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 32% and 37%.
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 31% and 34%.
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 32%.
Head to head. These sides have met 5 times in three years, producing over 2.5 goals in 20%. 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 32%.
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 35%, from expected goals of 1.55 for Quilmes and 0.53 for Club Atlético Güemes. Folding in 30% of that view gives 32%.
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 36%.
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 |
|---|---|---|---|---|
| Quilmes | 30 | 33% | 10% | 23% |
| Club Atlético Güemes | 30 | 43% | 20% | 57% |
More: Quilmes season stats · Club Atlético Güemes season stats · Primera Nacional table and form. Ratings are calibrated probabilities, not tips — a 60% call is expected to miss two times in five.