One Diamond Bidding System

Opening Bids Responder Rebids by Opener Rebids by Responder Rebids by Opener Rebids by Responder 1NT: 1. pass: 0-7pts For 2NT rebid： 15-17pts 2. 2NT: 8-10pts, balance hand 15pts: pass balance hand 3. 3NT: 11-15pts, balance hand 17pts: 3NT can have one 5 card minor 4. 4NT: 11-15pts For 4NT rebid： 5. 6NT: >= 16pts 15-16pts: pass 17pts: 6NT 16pts with 5 card minor: 6NT Overcall 1NT = open 1NT, same responses 2C: Stayman, >= 8pts 2D: 15-16pts, no majors 2H, 2S: 5 cards 3H, 3S: 2 card support 4H, 4S: 3 card support 4NT ask for A, 5NT ask K, then 6H,6S,6NT stop opponent overcall, response double=bid 2NT: 8-9pts, 4 cards of H or/and S pass or 3NT 2H/2S: 4 cards 2NT:17pts, no majors 3H, 3S: 5 cards 3NT: 2 cards of H or S, 4H, 4S: 3 cards 3C: 15-16pts, two majors 3D: 17pts, two majors 2D transfer, 0-7pts, >= 5 card heart 2H 2H transfer, 0-7pts, >= 5 card spade 2S 2S transfer, 0-7pts, >= 5 cards club or diamond 3C Pass: >= 5 card club 3D: >= 5 card diamond Pass 3♣/3♦ 6+minor suit, invitational to 3NT/5 minor 、 3♥/3♠ 6+card suit and slam interest 4♠/4♥/5♦/5♣ 6+card suit no slam interest 4C:blackwood ask A 4D:0/4A; 4H:1A; 4S: 2As; 4NT: 3As 5C:blackwood ask K 4NT (>= 16pts Quantitative, invites 6NT if max) 15-16pts: pass 17pts: 6NT 16pts with 5 card minor: 6NT 5NT (>= 20pts Quantitative, invites 7NT if max 17pts) 17pts: 7NT (total pts >= 37) 2NT: 1. pass: 0-4pts 20-21pts 2. 3NT: >= 5pts balance hand 3♣ Stayman can have one 5 card minor 3♦/3♥! transfer to 3♥/3♠ 4C:blackwood ask A 4D:0/4A; 4H:1A; 4S: 2As; 4NT: 3As 5C:blackwood ask K 4NT (>= 12pts Quantitative, invites 6NT if max) 20pts: pass 21pts: 6NT 20pts with 5 card minor: 6NT 5NT (>= 16pts Quantitative, invites 7NT if max 21pts) 21pts: 7NT (total pts >= 37) 3NT: 1. pass 0-1pts, no 5 card suits 25-27pts balance hand 4♣ Stayman can have one 5 card minor 4♦/4♥! transfer to 4♥/4♠ has all stoppers in all suits 4NT (Blackwood (not Quantitative since 4♣ would be used for Stayman)) 5C:0/4A; 5D:1A; 5H: 2As; 5S: 2As