Long Strong Heart suit with outside values and potential slam
4♥ - Relay asking partner to bid so the play is in their hand
4♠ - Choose to play in responders hand, no interest in slam
4NT - Checkback RKC
5 lvl bids, slam interest but bid suit shows xx or xxx in a suit looking for shortness
This page may direct you to a different system to return please click one of these links
Link to 2 Over 1
Link to Montreal Relay
Link to Precision