2♣ forces opener to bid 2♢. Responder's rebids between 2♡ and 3♢ are invitational. Thus: Pass to play 2♢ 2♡ or 2♠ = 4-card suit, only 4 diamonds, not forcing Opener should consider raising with 4-card support, even with a minimum. 2NT is a raise to 2NT with 5 or more diamonds. 3♣ is invitational 3♢ is 6+ diamonds invitational 3♡ and 3♠ show a singleton or void with 6 or more diamonds, GF. 3NT is a mild slam try with long diamonds. 4NT is a serious slam try with 5 or more diamonds. |