Two Diamonds

2D shows 4-10 HCP (Vulnerability dependent), 5+ Diamonds (6 when VUL) and usually no 4c Major. {Updated January 2015 by Will} Double by responder is penalty. Double by opener suggests extra shape. Responses to 2D: 2H      = Natural, constructive, NF. 2S      = Natural, constructive, NF. 2NT     = Puppet to 3C 3D      = To play. 3C      = Puppet to 3D 3H/3S   = Natural Forcing Generally 6+ cards (Otherwise 2NT->3C then 3M=5 cards)? 4C      = SPL 4D      = Preempt 4M      = To Play Continations: - (Opnr)  (Rspr)  2D  -   2NT (Puppet to 3C)   ??? 3C then 3D = INV Pass = Min 3M  = Max, Values for NT               3NT  = Max 3H/S = Natural Forcing (5 Card suit?) 3NT = CLUBS, GF, choice of contract 4C = CLUBS, RKCB? 4D = D, Forcing 4H = RKCB Diamonds (Opnr)  (Rspr)  2D  -   3C (Puppet to 3D)   3D then 3H = Suit Quality Ask 3S = Good 5 card suit 3NT = Bad 5 card suit 4C = Good 6 card suit 4D = Bad  6 card suit 3S = Shortage Ask 3NT = No Shortage 4C/H/S = Natural Shortage