[gglitch]

I don’t know editions subsequent to 2e, but I kind of liked THAC0. Tough to explain, but flexible. A useful abstraction.

[PhasmaFelis]

3E's Base Attack Bonus was mechanically identical, but expressed in an easier-to-understand way. Briefly, they rearranged things so that higher numbers are always better--having +1 armor no longer means you subtract 1 from your Armor class.