Steel man

Sometimes the term "steel man" is used to refer to a position's or argument's improved form. A straw man is a misrepresentation of someone's position or argument that is easy to defeat: a "steel man" is an improvement of someone's position or argument that is harder to defeat than their originally stated position or argument.

(sourced from http://lesswrong.com/lw/85h/better_disagreement/)

See also: Least convenient possible world