Too weak or too strong?

Mountain Mike

I know it's a casual world (Olynthus to be exact) and I love the blessed city, because in another world I kept getting conquered and my alliance mates weren't helping. But one aspect is absolutely ridiculous: "The target player is either too strong or too weak for you to attack". So what am I supposed to do? I have to either find a ghost town or find an enemy town that has the same points as me. Absurd.