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So there would be no wall then?On a normal pitch if you have an indirect free kick inside the box the defenders are allowed to be closer than 10 years only if they are standing on the goal line between the posts. In the absence of any instructions regarding the smaller pitch I would stick with that.
So if the kids asked for a wall what should I say?Well quite often you get a whole bunch of defenders standing on the goal line which I suppose you might call a wall. But not in the normal sense, no.
On the goal line inbetween the posts, actually.On the goal line would be the common sense answer then

There can be a wall - it just has to be on the goal line, that's all.So there would be no wall then?
I would slightly disagree - if you have a whole bunch of players lined up side by side in an effort to stop a free kick, I would still call it a wall. Sometimes it's a wall including every single player on the defending side.Well quite often you get a whole bunch of defenders standing on the goal line which I suppose you might call a wall. But not in the normal sense, no.