FA WSL (W) · Sunday, 27 September 2026. Final score 1–0 (half-time 1–0). Before kick-off we rated it 54% under 2.5 goals — the match finished with 1, 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 | 49% | 51% | Under |
| Over 3.5 goals | 30% | 70% | no pick |
| Both teams to score | 52% | 48% | Yes |
The result model puts Chelsea W at 31%, the draw at 29% and Arsenal W at 39%, from expected goals of 1.06 and 1.22.
The league sets the starting point. FA WSL (W) has produced over 2.5 goals in 55% of its matches, and that is where a team with no record of its own would sit.
Each side's own record. Chelsea W have 1 in 3 this season (0 of 2 at home), Arsenal W 0 in 3 (0 of 1 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 52% and 49%.
Last season still counts, briefly. With 3 and 3 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 51% and 53%.
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 52%.
Head to head. These sides have met 6 times in three years, producing over 2.5 goals in 50%. 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 52%.
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 40%, from expected goals of 1.06 for Chelsea W and 1.22 for Arsenal W. Folding in 30% of that view gives 49%.
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.
More: Chelsea W season stats · Arsenal W season stats · FA WSL (W) table and form. Ratings are calibrated probabilities, not tips — a 60% call is expected to miss two times in five.