After 1m-1M, 2M-?
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My good friend, Nicholas Lee, (presently in Germany) has collaborated with me in the formation of this structure

This is a version of what has been called GGBB or BBGG that we are calling BGGB.

We are very interested in your comments and feedback.

We were late comers to this idea. Our research into this type of agreement has been "macro," finding little in written literature.

There may be many better versions already in play, if so we would like to know of them.

Assume trump, the "next step" (2NT) becomes an asking bid, and opener will chose from these options:

3- all hands with 4 trumps, except the game acceptance that is not "super-max."

3- good hand holding 3 trumps

3-good hand holding 4 trumps that is accepting the game try (but not the "super-max")

3-bad hand holding 3 trumps

3NT-"super-max" with 3 trumps (this bid is still under consideration!)

Responder's options after 1m-1, 2-2NT, 3 (4 trumps less than a clear acceptance, or the "super-max.")

3-asks for a strength clarification

3- any non-accepting hand, or the "super-max"

3-sign-off, unless opener is "super-max"

3- on the fence (maybe yes, maybe no)

pass- responder with average, minimum game try

4- responder with very good game try

3-asking for shortness (game force)

3- the hand that was close to accepting game try w/o a singleton

3NT-the "super-max" w/o a singleton

4- 5431 or 6421 where the long minor is a good source of tricks

4-asks if the stiff is a minor

4-says no, the stiff is in hearts, but a good hand

4-says no, stiff in hearts, and a bottom hand

4NT-singleton in the minor, first step in RKC agreements

5/5/5-singleton is in minor, 2nd/3rd/4th step RKC

4- asks if singleton is in hearts

4-no, singleton is in om

4NT-RKC anyway

4- om splinter

4-splinter

4- the non-accepting hand w/o a singleton

3-slam try

3NT- serious, the "super-max"

4- club control, the "super-max"

4- less than an acceptance of the invite

3NT-very bad trump, pass or correct

Responder's options after 1m-1, 2-2NT, 3 (good hand with 3 trumps)

3- is "last train."

3-suit oriented (on the "weak but fast" side). Responder may pass this response!

3NT- content to play it here

3- game forcing, asking for shortness

3NT- no singleton

4-5431 and minor suit a good source of tricks

4-asks if stiff is in the minor

4- says no, stiff is in hearts with a good hand

4- says no, stiff is in hearts with a bottom hand

4NT- stiff minor, 1st step response to RKC...etc.

4-asks if stiff is in hearts

4-says no

4NT-says stiff heart, first step in RKC...etc.

3NT- ends the auction.

4/- is a cue bid, setting spades as trumps with interest in slam

Responder's options after 1m-1, 2-2NT, 3 (accepting game try, not super-max)

3- forcing, slam try, asking for shortness

3NT- no shortness, but a good hand (better than jump to 4)

4- 5431 or 6421 where long suit is a good source of tricks

4- asks if stiff is in minor

4-no, stiff is in hearts, but a good hand

4- ends auction

4-no, stiff is in hearts, and bottom of range

4NT- minor stiff, 1st step in RKC....etc

4-shortness is in om

4- shortness

4- bottom of range, no shortness

3NT- very weak trumps, can pass or correct

4m- natural slam try

4om- splinter

Responder's options after 1m-1, 2-2NT, 3 (bad hand with 3 trumps)

3NT- ends the auction

4- game try in the minor opened

4- forcing raise of minor opened, lacking a heart control

4- RKC for the minor

4- ends the auction