From Volmac Precision 2D Opening Meaning: 6+D, 11-15, KJT+ (or 5D AKQT/AKQJ), may have 5-crd major, may have 16+ if 6+ losers if minimum 1-suiter, have reason: like 2 of 3 top honors or 7 cards if 6-4 minors with good 4 and bad 6, consider opening 1D Responses 2H = relay (balanced invit+, or semisolid M slammish, or wk scramble nv) 2S = 5+S forcing 2N = 5+H forcing 3C = transfer to 3D: weak D, or 6+C GF+, or 5M-5other slam, or 5H-4S invit+ BPH: strong limit no major 3D = 5+C, 4M, 1D, no stop oM, GF+ BPH or after strong 1C: pree 3M = 6+M, invit, no C fit 3N = to play 4C = RKC for D 4D = pree 2D 2H relay (balanced invit+, or semisolid M slammish, or wk scramble nv) 2S = max 2N = relay (3C = unbal [3D asks which sing, 3H length ask D], 3D = bal 1-suiter [3M asks stop], 3M = 4-crd, 3N = 4C) 3C/D = 4H/S weak 3M = slammish M 2N = minimum no major 3C = GF relay, or strong invite BPH (3D = bal or s.o. opposite PH, 3M = sing, 3N = sing C or to play opposite PH) 3D = to play 3M = slammish M 3C = minimum, 4H (3D/H = to play, 3S = slammish S, 4C/D sets H/D) 3D = minimum, 4S (3H = slammish H, 3S = to play, 4C/D sets S/D) 3H = 5H ( 3S = H?, 4C sets •, 4D/H = to play, 4S slammish S, 4N RKC for H) 3S = 5S (4C/H sets D/S, 4D/S = to play, 4N RKC for S) 3N = 5C (4m = to play, 4H/S sets C/D, 4N RKC for D) 2D 2S (5+S forcing) 2N = 4H any strength 3C = relay (3D = min, no fit [3H = asks C stop, cue sets D], 3H = max no C stop [3S asks: 3N = half-stop C, 4C = HxS, 4D = no stop no xxS, 4S = xxS], 3S = min fit, 3N = max C stop, 4D = length, cue/4S = Hxx/xxxS max) 3D = to play 3H = 4H limit 3S = 6S GF 4D/cue = sets D/H 3C = max, at most xxxS 3D = to play (3S = xxx) 3H = C stop, maybe H stop (3S denies H stop) 3S = 6S GF 3N = H stop, no C stop 4D = sets D 4H = 5H GF 3D = min, no S fit or 4H (responses as above to 3C) 3H = 5H (3S = 6S or no C stop, 4D/M = to play, 4C sets H or D [4N RKC for D], 4N RKC for H) 3S = min 3-crd supp (3N = S?) 3N = max, HxxS 4C = 5C (4D/S = to play, 4H sets C or D, 4N = to play) 4D/H = max 4-crd supp picture/cue 4S = min 4-crd supp.