(aka 1C-Stayman Variation)"
1. Stayman 1C This is a query from the Opener, similar to an NT-Stayman convention. Responder just answers whether he has a 4-card Major or not. The distribution of the Openers hand is not really known. Some common distributions for Declarer are : - a) Declarer has a ≥5-card Club, 12-22HCP (re-bids Clubs) b) Declarer has a 4-card Major, 12-22HCP. Should not be a standard NT opening hand. c) Declarer may have 5-card Diamond, 4-card major. 12-22HCP (will re-bid Diamond if no major suit agreement). d) Declarer could even have a 5-4 in Majors, 12-22HCP (voluntarily re-bids a new Major) e) Declarer has a 4-3-3-3 hand and prefers to play in NT. 12-15HCP. f) Declarer has flat-hand, 19-20HCP (re-bids 2NT). 2. 1D Declarer is telling the responder not to bid any 4-card Majors. Responder either answers his 5-card Major, 5-card Minor, or heads for NT. Possible distributions for Declarer are: - a) Both Declarers Majors are less than 3-cards. He should have ≥3-card Diamonds. b) Declarer has 5-5 in Majors, 12-15HCP. (5-5 Majors, ≥16HCP are covered under RCO 2H Opening). 3. 1H or 1S Declarer has 5 or more of the bid Major, 12-22HCP. Declarer should not be holding 5-4 in Majors (else will bid 1C). Declarer should not be holding 5-5 in Majors (else will bid 1D or RCO 2H). If declarer re-bids the other Major, it is probably a 6-5 Major distribution, 12-15HCP. (6-5 Distributions with ≥16HCP are covered under the RCO 2H Opening). Proceedings are similar to Standard American. 4. 1NT Declarer has Flat-Hand, 16-18HCP. Proceedings are similar to Standard American. 5. 2C Declarer has one of the following distributions: - a) ≥5-card major, ≥19HCP, ≤4 loser hand. b) ≥23 HCP, no double-suited hand (else will bid RCO bids). 6. Multi-Tiered 2D (aka Multi-2D) Declarer has one of the following distributions: - a) Weak, pre-emptive hand, ≥6-card major. (re-bids Majors) b) Flat-Hand, 21-22HCP (re-bids NT) c) Strong Hand with ≥5-card Minors. ≥9 playing tricks. (re-bids Minors) 7. Rank-Colour-Others 2H (aka RCO 2H) RCO bids describe strong 2-suiter hands (≥16HCP). RCO 2H describes 2-suits of the same Rank (Majors or Minors) Responder should relay with 2S. The following are the interpretations to the re-bids: - a) 2NT: 5-5 in Minors, 16-18HCP. b) 3C: 5-5 in Minors, ≥19HCP. c) 3D: 5-5 in Majors, 16-18HCP. d) 3H: 5-5 in Majors, ≥19HCP. 8. RCO 2S Describes Strong hand with 2-suits of the same Colour. Responder should relay with 2NT. Re-bid interpretations as follows: - a) 3C: 5-5 in Black suits, 16-18HCP. b) 3D: 5-5 in Red suits, 16-18HCP. c) 3H: 5-5 in Red suits, ≥19HCP. d) 3S: 5-5 in Black suits, ≥19HCP. 9. RCO 2NT Describes Strong hand with 2-suits not covered by 2H or 2S openings. Responder should relay with 3C. Re-bid interpretations as follows: - a) 3D: 5-5 in Diamonds and Spades, 16-18HCP. b) 3H: 5-5 in Clubs and Hearts, 16-18HCP. c) 3S: 5-5 in Diamond and Spades, ≥19HCP. d) 3NT: 5-5 in Clubs and Hearts, ≥19HCP. 10. 3C, 3D, 3H, or 3S Typical Standard-American 7-carder pre-empt hand.
1) Not that it really matters, but I think this is not GCC Compliant. Going by what I saw in Orange book, I don't think it is legal in EBU territory as well?
2) What would be a good defense to the various artificial bids?
Disclaimer: I did not come up with this system.
Further Disclaimer: Any resemblance to any person, dead or living is purely coincidental.

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