Crowd noise moves referees more than managers do

Home advantage survives everything the game throws at it, and the loudest surviving explanation is the one nobody can coach away.

Managers talk about the crowd as though it lifts their players. I have never entirely believed it. What I do believe, because the games played in empty stadiums during the shutdown made it awkward to ignore, is that the crowd works on the officials.

The pattern in those empty matches was consistent enough to be interesting. Home teams did not lose their advantage entirely, but a chunk of it went, and the clearest movement was in the decisions. Fewer bookings for away sides than usual. The gap between what the home team was penalised for and what the visitors were penalised for narrowed.

That points at a mechanism rather than mysticism. A referee makes hundreds of calls, most of them genuinely marginal, in real time, with no chance to review. Marginal is the key word. When the evidence is ambiguous, the brain uses whatever else is available, and forty thousand people screaming immediately after a challenge is information. Not consciously weighed. Just present.

Noise also does something less discussed, which is that it hides things. A ball flicking a boot, a shirt pull, a foul heard rather than seen: officials rely on sound more than people assume, and a stadium at full volume removes that channel entirely. Some of the decisions that go the home team's way are not bias. They are a referee who genuinely could not detect the contact.

Video review was supposed to solve this and has solved perhaps half of it. The reviewable categories are narrow, and the ones that remain, the fouls that do not lead directly to a goal, the free kicks in dangerous areas, the corner that was really a goal kick, are exactly the ones where atmosphere is doing its work. Those decisions accumulate across ninety minutes into territory, and territory into chances.

The uncomfortable implication is that stadium design has a competitive value nobody prices. A steep, close, enclosed ground that keeps sound over the pitch is worth something in points, and a bowl with a running track around it is not. Clubs building new grounds seem to understand this instinctively while never quite saying it out loud.

Which makes atmosphere a piece of infrastructure rather than a mood. You cannot sign it in January, and it turns up in the table anyway.