One Diamond Bidding System
Opening Bids Responder Rebids by Opener Rebids by Responder
2C, artificial, force 2D: 0-4pts 2NT, balance card, 22-24pts 3C (2-4pts): Stayman; 3D transfers to 3H etc.
>= 22pts opponent Dbl, pass 0-1pts; re-Dbl 2-3pts; 2D 4pts C/D/H/S: >= 5 cards, 22-24pts
or special hand with 9 winner tricks 2H/2S, >= 5pts, >= 4 cards Jump C/D/H/S: >= 5 cards, >= 25pts
3C, >= 5pts, >= 5 cards
2NT: >= 5pts
3D/H/S: >= 10pts, >= 5 cards
2D/2H/2S weak preempt open 1. pass
5-11pts 2. Add one: 3D/3H/3S preempt
>= 6 cards 3. 5D/4H/4S: preempt
4. New suit, >= 6 cards, not force
5. 2NT (Ogust Responses) 3♣：minimum points, poor suite 1. sign off in partner's suit at 3 level
3♦：minimum points, good suit 2. bid 3NT
3♥：maximum points, poor suite 3. Jump to "game" in partner's suit
3♠：maximum points, good suit 4. introduce a new suit, a cuebid agreeing partner's suit. (Slam interested)
minimum points: 5-8 HCP
Maximum points: 9-11 HCP
poor suit: 1 of top 3 honors (AKQ)
good suit: 2 of top 3 honors (AKQ)
Fourth position, 2D/2H/2S 5. 2NT (Ogust Responses) 3♣：minimum points, poor suite 1. sign off in partner's suit at 3 level
9-11pts 3♦：minimum points, good suit 2. bid 3NT
>= 6 cards 3♥： maximum points, poor suite 3. Jump to "game" in partner's suit
3♠：maximum points, good suit 4. introduce a new suit, a cuebid agreeing partner's suit. (Slam interested)
minimum points: 9-10 HCP
Maximum points: 11 HCP
poor suit: 1 of top 3 honors (AKQ)
good suit: 2 of top 3 honors (AKQ)
Opening Bids Responder Rebids by Opener
3C/3D weak preempt open 1. pass
6-10pts 2. 4C/4D preempt，5C/5D, stop
>= 7 cards 3. 3NT, stop
4. 3H/3S: seek 3 card support 1. has 3 card support, 4H/4S
2. no 3 cards, stop or 4C/4D
3H/3S weak preempt open Weak, pass
6-10pts 3NT, stop
>= 7 cards 4H/4S, stop
4C/4D weak preempt open 1. pass
6-10pts 2. 5C/5D, stop
>= 8 cards 4. 4H/4S: seek 3 card support 1. has 3 card support, stop
2. no 3 cards, stop or 5C/5D
5. 4NT ask A
4H/4S weak preempt open 1. pass
6-10pts 2. 4NT ask A
>= 8 cards, <= 1A