Arsenal vs Lille
Our model puts an Arsenal win at 74.9% in this UEFA Champions League fixture — the clearest call on this fixture. Expected goals run 2.4 to 0.67.
What this probability has been worth
A number is worth what it has been worth. Across 1,876 predictions published before kick-off and scored against the result afterwards, the calls we priced between 65% and 75% came in 70.9% of the time — 172 fixtures in that band. The model claimed 69.4%, so the two are within 1.5 points of each other. In this range the stated probability has meant roughly what it says.
Where we disagree with the market
Bookmakers price Arsenal at 1.21, which implies about 82.6%. Our model has it at 74.9% — 7.7 points lower. That is a wide gap, and it is worth being plain about what it means: it is not a claim that the price is wrong and we are right. It means two methods that usually agree have landed far apart on this one, and only the result will say which of them read it better.
The ratings gap
Arsenal carry a rating of 2013 against 1726 for Lille, a gap of 287 points. On our scale that is the difference between a side that controls most of its fixtures and one that has to earn each of them. It is also the single largest input into the probabilities above.
Attack against defence
The single rating hides where the mismatch actually sits. Splitting it, Lille's attack will struggle to break down Arsenal's defence, by 206 points. That is the mechanism behind the expected-goals line rather than a separate opinion about it.
Finding the target
Lille hits the target more often than almost anyone: 46.2% of their shots are on goal over their last matches. The average across the sides we have figures for is 34.1%. Accuracy is not the same as scoring — it says how much of a side's shooting is worth a goalkeeper's attention, which is the part that does not swing as wildly from week to week as goals do.
Early or late
38.9% of Arsenal's goals have come after the break, against 55.6% for the sides we measure, over 18 goals. A side that does its scoring early has more to protect than most, and a lead at the break is likelier to be the story of the match than the first act of it.
Behind the defence
84.8% of the shots on target Lille face do not end up in the net, against 67.4% for the sides we measure. That is a keeper and a defence having a good run of it — and a figure that tends to drift back toward the middle, which is worth remembering before reading too much into it.
A high-scoring home side
One model here does nothing but estimate how likely the home side is to score four goals or more, and on this fixture it reads 76.4%. Across our settled fixtures that happens about 8% of the time, so this is well above ordinary. It says nothing about who wins — a side can score four and still be caught — but a match where one team is expected to run up a total is one where the scoreline is much harder to call than the result.