I'm not a complete idiot, and my idea is founded.

Erfworld isn't chainmail. The hero in Erfworld actually plays chainmail. Or D&D on hexes; I don't think it really specifies. Erfworld is war on a massive hexgrid.

I'm not suggesting that Weis and Hickman invented the hexgrid either.

Of course, it's also possible that Rob Balder came up with the idea all by himself. But giving a chap the benefit of the doubt is no fun at all.