Inverted minors refers to a treatment introduced by the Kaplan–Sheinwold (K–S) bidding system for the popular card game bridge.
In either case, the partnership is on solid ground after a single raise: opener is either unbalanced or strong, and responder has at least an average hand.
If opener has a three-card minor, he most often has a strong notrump hand; then, if desirable, it is easy to veer into no trump following the single raise.
There are many possible continuations after responder has raised and several are shown below, some partnerships find the risk of forgetting or making an error sufficient to ignore most of these.
The exception occurs when opener has a very strong hand and the vulnerability, type of scoring, or partnership agreement means that responder is likely to be in 6-9 HCP range.