One Diamond Bidding System

Open Bid 1. 1C, artificial, force 17 to 21pts, (rebid NT, balance card, 18-19pts) 2. 1D, artificial, force 12 to 16pts, no 5 card majors 3. 1H/S 12 to 16pts, >= 5 cards 4. 1NT 15-17pts,balance cards, can have one 5 card minor 5. 2C, artificial, force >= 22pts, or special hand with 9 winner tricks 6. 2D/H/S weak open 5-11pts, 6 card suit. 2NT Ogust Responses 7. 2NT 20-21pts, balance hand 8. 3C/D/H/S weak open 6-10pts, 7 card suit 9. 3NT 25-27pts, balance hand, has all suit stoppers 10. 4C/D/H/S weak open 6-10pts, >= 8 card suit, <= 1A 11. Third and fourth position open. 1D/H/S 10-16pts 12. Fourth position open. 2D/H/S 9-11pts, 6 card suit Good hand, bid slow; weak hand, bid fast All others are natural bids New suit, force; Cue bid, force Alterntive bidding, create a bid to close the original bid Five card without AKQ, may consider four card Overcall: 1) one over one, >= 8pts, >= 5 cards; 2) Two over one, 11-16pts, >= 5 cards; 3) jump bid new suit, <= 10pts, >= 6 cards; 4) 1NT: 15-17pts. 5) Cue bid >= 17pts, singleton or void, for 1st round bid at any situation 6) For opponent pre-empty 4H/4S, bid 4NT: two minor suits Double: >= 12pts, rebid new suit >= 17pts; partner response 1) >= 4 card majors; 2) 5 card minors Double: >= 12pts, 1) partner response, rebid NT >= 12pts balance hand; 2) opponent overcall, partner no response, rebid NT >= 18pts balance hand Fourth Position Balance Double: 9-11pts, seeking 4-4 fit (1C/D/H/S-Pass-1NT-double (also for 1st pass, then 2nd double)) Double, rebid new suit: >= 17pts, not force Double, rebid jump new suit or cue bid opponent suit: >= 17pts, force Unusual 2NT：>=10pts, two lower suits; 1D-2NT, C and H; 1H-P-2D-2NT, S and C; 1H(S)-P-2H(S)-2NT, C and D Opponent weak bidding upto 4H/S, 5C/D, overcall double is take-out double, not penalty double. Partner may pass for penalty but usually bid 5 or 4 card suit Notes 4NT (Quantitative to 1NT): response bid 17pts, or 16pts and has a 5 card minor, bid 6NT 1NT overcall = 1NT open bid, partner response same bidding e.g. 2C=stayman etc Opponent 1NT open bid, double >= 15pts, partner response, real suit 1) >= 4 majors, 2) >= 5 minors