Definitive Illegal Formation Rules

[Potemy]

1 of my friend uses this formation and got 20% ball possesion. It meets ALL requirements. I don't know why it's illegal.

---ST ST ST---

----MC MC-----

DL DC DC DC DR
------GK-------

Looks fine to me, 5-2-3 is actually a real life formation, albeit a rare one. Maybe his team is just really bad, or maybe you need 3 midfielders? The yellow players, that is.

Based on the known facts, here are my Hypothetical formation rules:

Requirements:

• Goalkeeper
• Some combination of 3 DBs/FBs (3 players anywhere in the back row )
• At least 1, but no more than 2, players on EACH outside flank. {the D(L/R), DM(L/R), M(L/R), AM(L/R) slots}
• at least 1 MC (DMC doesn't qualify)
• at least 1 Striker

You don't need at least one MC, you need at least one player in that row. Having just an ML or MR is fine as well. The rest is all correct, but I'd just write defenders, I don't think anyone uses DB, and FB is only used for the side defenders. I think those are all the rules regarding illegal formations. Tentatively, I'm suggesting that you need at least 3 midfielders, yellow dots in the formation box in-game.

There's no need to list out all the known illegal formations, because let's say we're listing out illegal formations due to no right sided player, you can have any combination of 10 players in the other 19 positions as long as they aren't on the right, and then there are other rules for illegal formations, left sided, 3 defenders, etc, so a final list would be too long.