I have never understood the definitions of HUM. First, what are "values generally accepted for an opening bid of one"? Second, does "alternative weak possibilities" relate to Pass being multi way bid? If so, suppose Pass is either 0-11 or 12-14. If we take 12-14 as "values generally accepted for an opening bid of one" and 0-11 as "even if there are alternative weak possibilities" this seems to classify as HUM. Right? What does "weaker" mean? In a similar thread from 2006, a poster said that However, I don't see this stated explicitly anywhere nor there seem to be anything what would imply it. Even so, if you can use any system you want, you can design evaluation scheme that intentionally subverts the purpose of the rule. Is this the same as saying "[...] an opening bid at the one level has to promise at least 8hcp"? This rule seems ridiculous, because according to the definition of length and shortage a suit is always either short or long. Take 1♠ as promising 5+♠, now your ♥'s are always either long or short and hence HUM. This seem to imply that 1♣ = 13+ with either 5♥+ or 5♠+ is explicitly not HUM. Right? In my examples the bid implies rather than shows, but I see no reason to make a distinction. Thank you!