Here is one simple fundamental thing. With forcing bids, you have more sequences.
Consider natural system starting with 1D-1H. Now without any special agreements, you have exactly two forcing bids (without support): 2S and 3C. Only two! And still you could hold a huge variety of different hands. Especially after 3C rebid you are totally cramped, there's just no way to sort anything out sensibly. So we need forcing bids to have more sequences, yet stopping low enough when needed. Seems like a place for transfers. One solution is the gazzilli approach, you sacrifice 2C, the least needed non forcing bid for artificial use. This is good and reasonable, but I don't find it to my liking. I like gazzilli in major sequences, but here it has bit of a problem. Your most likely safe haven is 2D, yet with that 8+ responder must bid past that and now we could be in a slight trouble.
Actually my context is bit different. My diamond opening is unbalanced and could have longer clubs. This frees up the huge block of 1NT rebid for other purposes. When you use that as gazzilli, you are in a much better shape. But I still want more. I want to be able to raise with three card support and I want to differentiate it from four card support. (It's much easier to do marginal invites as responder when you know there is a real support) I'd also like to find a solution to the everlasting problem of losing hearts after 1D-1S sequence when responder doesn't have strength.
So, the transfer rebids of opener:
1D - 1H ->
1S = 4+ clubs, any strength
1NT = 4S, less than a game force
2C = 6+ diamonds, any strength
2D = 3+H, any strength (Assume minimum raise with 3 card support)
2H = 4H raise
2S = 4S5+D, GF
2NT = ? My diamond includes 19-21 balanced and it's here. You can find many uses for it.
3C = 15-17 55+ minors
3D = 15-17 6+ good diamonds, no 3 card support for partner
3H = 15-17 4H, no 6+ diamonds
3S = 15-17 4H, 6+D, short spades
3NT = Solid 7+ diamonds with little on the side
4C = 15-17 4H, 6+D, club singleton
4D = 15-17 1471
4H = 15-17 4H, 6+D, club void
Just looking at those, I have gained two (3 if you count 2NT) more forcing bids compared to natural and they are all very low. This means that I can start describing my shape with same bids whether I am minimum or really strong and when partner shows weakness by completing the transfer, I can come back filling the gabs in my shape with the extra strength I hold. Lets see all the hands I can bid intelligently when all the responder does is accept the transfer (or when showing both minors, takes a preference).
1. Hands with support:
Min with 3 card support: Transfer to partners suit and pass
Min with 4 card support: Direct raise
Medium with 3 card support: Make a descriptive transfer bid before raising partner (With the exception of 4351/4360 you transfer to hearts and bid spades)
Medium with 4 card support: Without 6 card suit, raise to 3. With 6+D, splinter.
GF with 4 card support: Transfer to partners suit and splinter/some other descriptive bid
GF with 3 card support and 6+D: Transfer to partners suit and bid diamonds.
GF with 3 card support and both minors: Transfer to clubs and bid 3D to show doubt about 3NT which might be due 3 card support or lack of stopper in oM
2. Hands with both minors:
Min hand with (54), 55 or 46+ minors: Transfer to clubs and pass the preference
Min hand with 6+4 minors: Transfer to clubs and bid 2D over 2C preference
Medium with 55 minors: Rebid 3C
Medium with 46 minors: Transfer to clubs and bid 3C
Medium with 64 minors: Transfer to diamonds and bid 3C
Medium+ with (54) minors: Transfer to clubs and bid 2NT (Denies 3 card support for major)
GF with 55+ minors: Transfer to clubs and rebid 3H (With wilder shapes you can bid 4m)
GF with 64 minors: Transfer to diamonds and rebid 3S
GF with 46 minors: Transfer to clubs and rebid 3S
GF with (54) minors: Transfer to clubs and rebid 3NT or 3D to show doubt about 3NT
3. Singlesuited diamond hands: (These deny 3 card support)
Min hand with long diamonds: Transfer to diamonds and pass (With 3 card support you can opt which one you prefer to show)
Medium hand with good long diamonds: Rebid 3D
Medium hand with bad long diamonds: Transfer to diamonds and rebid 2NT
GF hand with long diamonds and shortness: Transfer to D and rebid 3D
GF hand with long diamonds and no shortness: Transfer to D and rebid 3H
Solid 7+ diamond suit with just something little on the side: Rebid 3NT
Solid 7+ diamond suit with more stuff on the side: Transfer to D and rebid 3NT
4. Hands with other major:
Over 1H:
Bid 1NT with any 10-14 and 15-17 unless 3 card heart support or 6+D
Medium 4351/4360: Transfer to hearts and bid spades
Medium 4S6+D: Transfer to diamonds and bid spades
GF 4135/4144/4045/4054: Transfer to clubs and bid spades
GF, 4S and no clubs: Jump to 2S
Over 1S:
With any min or medium 45 reds: Rebid 2D (With 1444 min you can try 2D or just transfer to clubs and pass the pref and hope for the best)
With medium 46+ reds: Transfer to D and rebid 2H
With GF 1444/0445/0454/1453: Transfer to C and rebid 2H
With other GFs: Transfer to spades and try to untangle it with appropriate rebid then.
If you want to know more about the structure, responder's bids or something else, just email me and I'm happy to fill up on it. Also all the ideas on this are more than welcome.
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