their responses are 3M = 5-card, 3♣ = no 5-card M. They use it in the following situations: - looking for 5-3 M fit - GF stayman with a 4-card major, not both (concealing opener's hand: responder shows which 4-card M he has, nothing is known about the other M) - GF (31)(45) hands - and some balanced slam try hands with 3-card M