STAYMAN

Everybody plays this one (If not they should)

Opener Responder

INT 2♣

Or

2NT 3♣

Responder is asking “Have you got a 4 card major (♠/♥) partner”

Without one, opener rebids 2♦ (or 3♦ after 2NT)

The Stayman convention was invented by George Rapee in 1945, but the first article on the convention was authored by Sam Stayman Rapee’s Partner, and the convention was named for the writer rather than the inventor.